研究者詳細 - 市野　良一

Utilization of agricultural waste to herbicide removal: Magnetic BEA zeolite adsorbents prepared by dry-gel conversion using rice husk ash–derived SiO<inf>2</inf> for paraquat removal 査読有り国際共著国際誌

Phouthavong V., Hagio T., Park J.H., Nijpanich S., Srihirunthanon T., Chantanurak N., Duangkhai K., Rujiravanit R., Chounlamany V., Phomkeona K., Kong L., Li L., Ichino R.

Arabian Journal of Chemistry 16 巻 ( 8 ) 2023年8月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Arabian Journal of Chemistry

This study presents a method that will allow for the sustainable utilization of rice husk ash-SiO2 (RHAS), an agricultural-waste–derived material, as a bulky solid SiO2 source in the zeolite beta (BEA)/Fe3O4 composite (magnetic RHAS-BEA) synthesis via a dry-gel conversion method for the removal of paraquat, a typical herbicide, from aqueous solutions. Ultrasonic waves were used to facilitate the formation of uniform Fe3O4-contained dry precursor gel before converting to the magnetic BEA zeolite composite for the first time. Magnetic RHAS-BEA was then characterized and compared with a non-magnetic sample (RHAS-BEA) using X-ray diffraction and field-emission scanning electron microscopy. In terms of adsorption, we found that paraquat had a high adsorption rate on the samples and conformed to a pseudo-second-order kinetic model. The adsorption behavior of paraquat on the synthesized RHAS-BEA and magnetic RHAS-BEA obeyed the Langmuir adsorption isotherm model. The synthesized adsorbents were reusable for at least four cycles, via thermal regeneration at 450 °C. The inclusion of Fe3O4 particles in magnetic RHAS-BEA disrupted neither the crystallization of the BEA zeolite nor the adsorption of paraquat and enabled easy collection via an external magnet.

DOI： 10.1016/j.arabjc.2023.104959

An effective strategy for improving the performance of electrodeposited Fe-W alloy plating: Tailoring microstructure by graphene incorporation 査読有り国際共著国際誌

Shinohara Y., Park J.H., Hagio T., Kim J.I., Lee W.Y., Umehara N., Ichino R.

Materials and Design 230 巻 2023年6月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Materials and Design

Despite the excellent performance of hard Cr plating using hexavalent chromium (Cr6+), its use is being restricted owing to recent environmental regulations. Electrodeposited Fe-W alloy is considered a possible alternative, but its high coefficient of friction (COF), high wear rate owing to tribo-oxidation, and high corrosion rate hinder its practical application. In this study, we attempted to solve these problems by modifying the microstructure of Fe-W alloy by incorporating 2D-structured graphene. The effect of graphene incorporation on the structure of the Fe-W alloy and its properties, especially microhardness, wear, and corrosion resistance, were investigated. The results showed the graphene effectively modified the columnar structure of the Fe-W alloy by inhibiting the vertical growth of clusters during electrodeposition, leading to fragmentation of the vertical cluster boundaries. This improved the hardness by as much as 17 % up to 9.1 GPa, and the corrosion resistance by changing the corrosion mechanism from localized corrosion to uniform corrosion. In addition, the graphene reduced the COF and wear rate by reducing the Fe2O3 formed by tribo-oxidation to a lower oxidation state. The structural modification of the plating by graphene incorporation thus provides an effective solution to improving the performance of Fe-W alloys.

DOI： 10.1016/j.matdes.2023.111938

Preliminary Study on Electrodeposition of Copper Platings and Codeposition of Carbon Nanotubes from Organic Solvent 査読有り国際誌

Park J.H., Fujita Y., Hagio T., Phouthavong V., Kamimoto Y., Bessho T., Ichino R.

Coatings 13 巻 ( 4 ) 2023年4月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Coatings

Metal/carbon composite plating is an effective strategy for improving and adding properties to metal plating by incorporating carbon materials into the metal matrices. Copper (Cu) is widely applied, particularly in the areas of heat management and electronic packaging owing to its high thermal and electrical conductivities, which can be further improved together with improvements in mechanical properties by compositing it with carbon nanotubes (CNTs). However, because hydrophobic CNTs are hardly dispersible in aqueous solutions, additional intense acid treatment or the addition of dispersants is required for their dispersion. Moreover, previous studies have reported that these methods suffer from deterioration of composite material performance through the destruction of the CNT surface or the inclusion of dispersants into the plating. Therefore, in this study, the electrodeposition of a Cu/CNT composite in a non-aqueous solvent that can disperse CNTs without any additional treatment is investigated. The experimental results show that it is possible to deposit Cu from a N-methyl-2-pyrrolidone containing copper iodide and potassium iodide. Furthermore, Cu/CNT composite platings containing CNTs up to 0.12 mass% were prepared by constant current electrolysis, and applying pulse electrolysis can increase the CNTs content up to 0.22 mass%.

DOI： 10.3390/coatings13040802

Magnetic Adsorbents for Wastewater Treatment: Advancements in Their Synthesis Methods 査読有り国際共著国際誌

Phouthavong V., Yan R., Nijpanich S., Hagio T., Ichino R., Kong L., Li L.

Materials 15 巻 ( 3 ) 2022年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Materials

The remediation of water streams, polluted by various substances, is important for realizing a sustainable future. Magnetic adsorbents are promising materials for wastewater treatment. Although numerous techniques have been developed for the preparation of magnetic adsorbents, with effective adsorption performance, reviews that focus on the synthesis methods of magnetic adsorbents for wastewater treatment and their material structures have not been reported. In this review, advancements in the synthesis methods of magnetic adsorbents for the removal of substances from water streams has been comprehensively summarized and discussed. Generally, the synthesis methods are categorized into five groups, as follows: direct use of magnetic particles as adsorbents, attachment of pre-prepared adsorbents and pre-prepared magnetic particles, synthesis of magnetic particles on pre-prepared adsorbents, synthesis of adsorbents on preprepared magnetic particles, and co-synthesis of adsorbents and magnetic particles. The main improvements in the advanced methods involved making the conventional synthesis a less energy intensive, more efficient, and simpler process, while maintaining or increasing the adsorption performance. The key challenges, such as the enhancement of the adsorption performance of materials and the design of sophisticated material structures, are discussed as well.

DOI： 10.3390/ma15031053

Nano ferric oxide adsorbents with self-acidification effect for efficient adsorption of Sb(V) 査読有り国際共著国際誌

Feng X., Yan R., Zhang Q., Wan Q., Hagio T., Ichino R., Kong L., Cao X., Li L.

Chemosphere 272 巻頁： 129933 2021年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemosphere

It is urgent and essential to remove antimony from wastewater due to its potential carcinogenicity. In this paper, a nano ferric oxide (NFO) adsorbent was synthesized in a one-step low temperature calcination (150 °C) process. It presents a surprising self-acidification behavior, could automatically adjust the pH to around 4 from different intimal pH values (4–9), which enable it to efficiently remove more than 99% of Sb(V) from wastewater in a wide pH range. X-ray photoelectron spectroscopy analysis proved that the self-acidification function was originated from the hydrolyzation of surface Fe atoms on ferric oxide nanoparticles. The maximum adsorption capacity of this adsorbent is 78.1 mg/g which is 2–3 times higher than that of the samples obtained at higher temperatures (250 °C and 350 °C), and also its adsorption kinetic constant is ten times higher, which can be attributed to the larger surface areas and smaller sizes of ferric oxides synthesized at 150 °C. In the actual wastewater treatment, the effluent's concentration after treatment can be maintained below the instrument detection limit even under low initial antimony concentration. We believe that this new adsorbent has great potential in the practical application in the treatment of Sb polluted wastewaters due to its simple synthesis, high efficiency, and low cost.

DOI： 10.1016/j.chemosphere.2021.129933

Facile Hydrothermal Synthesis of EAB-Type Zeolite under Static Synthesis Conditions 査読有り国際共著国際誌

Hagio T., Park J.H., Lin Y., Tian Y., Hu Y.H., Li X., Kamimoto Y., Ichino R.

Crystal Research and Technology 56 巻 ( 4 ) 2021年4月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Crystal Research and Technology

Conventionally, EAB-type zeolites are crystallized by hydrothermal synthesis for many days under agitational synthesis conditions such as rotation or stirring. In the present study, EAB-type zeolite is obtained by hydrothermal synthesis within 12 h under static synthesis conditions for the first time. The effects of crystallization temperature, aging of the precursor sol, and addition of seed crystals are investigated. The results reveal that EAB-type zeolite can be obtained when using a precursor sol with short aging time followed by hydrothermal synthesis in a very narrow temperature range 110 °C−120 °C under static synthesis condition. Addition of seed crystals is found to suppress the formation of SOD-type zeolite, the primary phase at high hydrothermal synthesis temperatures, while it does not increase the crystallization rate of EAB-type zeolite. Furthermore, the crystallization behavior at 120 °C is examined by varying the synthesis time. EAB-type zeolite with invariably twinned plate-like morphology starts to crystallize between synthesis time of 3 to 6 h at 120 °C under the static synthesis condition.

DOI： 10.1002/crat.202000163

Development of novel nanoporous hexagonal tungsten oxide membrane for separation of water/acetic acid mixtures via pervaporation 査読有り国際誌

Kunishi H., Hagio T., Wada S., Kamimoto Y., Ichino R.

Journal of Membrane Science 620 巻 2021年2月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Membrane Science

A novel nanoporous hexagonal tungsten oxide (NP-h-WO3) membrane was developed for separating water/acetic acid (H2O/AcOH) mixtures. The nanopores on the c-plane of h-WO3 are larger than H2O molecules and smaller than AcOH molecules and thus should allow for their effective separation. Moreover, h-WO3 exhibits high stability in acids (pH < 4). Therefore, c-axis-aligned NP-h-WO3 membranes are promising for the separation of H2O/AcOH mixtures. Given this background, we report, for the first time, the synthesis of c-plane-aligned dense NP-h-WO3 membranes on porous ceramic supports via the hydrothermal method using a precursor solution containing AcOH. The presence of AcOH and the concentration of Na2WO4 in the precursor solution are the key factors affecting crystal growth and alignment along the c-plane. A high Na2WO4 concentration is necessary for obtaining membranes with a high degree of c-plane alignment. Thus, dense, c-plane-aligned NP-h-WO3 membranes could be fabricated by precoating the support with amorphous WO3 seeds and subsequent hydrothermal synthesis in a precursor solution of Na2O/WO3/AcOH/H2O (1/1/0.88/201) at 180 °C for 24 h. The fabricated membranes exhibited a maximum separation factor of 42.6 during the pervaporation of a H2O/AcOH mixture (10/90 (w/w)) at 80 °C. Thus, these NP-h-WO3 membranes are highly suited for H2O/AcOH separation.

DOI： 10.1016/j.memsci.2020.118860

Synthesis of C-plane oriented hexagonal tungsten oxide membranes on tubular substrates and their acetic acid/water separation performances 査読有り国際共著国際誌

Kunishi H., Wada S., Kamimoto Y., Ichino R., Lin Y., Kong L., Li L., Hagio T.

Membranes 11 巻 ( 1 ) 頁： 1 - 17 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Membranes

Hexagonal tungsten oxide (h-WO3) membrane is a novel candidate for dehydration of acetic acid (CH3COOH)/water mixtures owing to its molecular sieving property and acidic resistance. Meanwhile, c-plane orientation is an important factor for h-WO3 membranes because the pores of h-WO3 run along its c-axis. However, so far, high c-plane orientation has not been successful on tubular substrates. Here, the effect of synthesis conditions of h-WO3 membranes on tubular substrates against c-plane orientation and CH3COOH/water separation performance are investigated. The h-WO3 membranes were prepared by hydrothermal synthesis from a precursor sol containing various amounts of sodium tungstate (Na2WO4) in the presence of tubular substrates with seeds embedded on their outside surface. The seeding method and the amount of Na2WO4 in the precursor sol significantly affected both crystal orientation and densification of the membrane. A precursor sol with appropriate amounts of Na2WO4 was essential to simultaneously satisfy high c-plane orientation and densification of the membrane while excess Na2WO4 drastically decreased the degree of c-plane orientation. A highly c-plane oriented h-WO3 membrane was successfully obtained under the optimized condition, which exhibited a maximum separation factor of 40.0 and a water permeance of 1.53 × 10−7 mol·m−2·s−1·Pa−1 in a 90:10 wt % CH3COOH/water mixture. The water permeance approximately doubled compared to the previous report, possibly owing to the significantly higher degree of c-plane orientation. Furthermore, it was found that its separation ability can be maintained while stored in 90:10 wt % CH3COOH/water mixture with pH < 0 for more than 500 h.

DOI： 10.3390/membranes11010038

Electrodeposition of nano-diamond/copper composite platings: Improved interfacial adhesion between diamond and copper via formation of silicon carbide on diamond surface 査読有り国際誌

Hagio T., Park J.H., Naruse Y., Goto Y., Kamimoto Y., Ichino R., Bessho T.

Surface and Coatings Technology 403 巻 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Surface and Coatings Technology

Although copper is an effective heat-dissipation material, a material with a higher thermal conductivity is required to meet the demands of future electronics. Carbon materials (CMs) are of great interest owing to their excellent thermal conductivities; however, it is difficult to apply CMs individually because of their brittleness and low formability. CM/copper composites are expected to overcome these drawbacks. Diamond is of special interest for preparing composites because they do not require control of orientation owing to their isotropic thermal conductivity, but unfortunately, diamond and copper generally show poor interfacial adhesion. Therefore, designing an interface to improve their adhesion is essential to realizing high thermal conductivity. In this study, SiC-coated diamonds were adopted to fabricate diamond/copper composite platings by electrodeposition for the first time. Electrodeposition was carried out in a copper sulfate bath containing pristine and SiC-coated diamonds. The formation of SiC slightly decreased the current efficiency but did not significantly affect the diamond content of the plating. The sample with the nano-diamond/copper composite plating containing 1.07 mass% (2.72 vol%) of SiC-coated nano-diamonds exhibited a thermal conductivity 46 Wm−1 K−1 higher than that of the sample with pure copper plating. From observations of the diamond/copper interface using micron-sized diamonds as a model, an obvious gap was observed between the diamonds and the copper when using pristine diamonds, whereas no gaps were observed when using the SiC-coated diamonds. SiC formation significantly improved the adhesion between the diamonds and copper. In addition, copper was directly deposited onto the surfaces of the SiC-coated diamonds in contrast to pristine diamonds, which showed no sign of deposition.

DOI： 10.1016/j.surfcoat.2020.126322

Electrodeposition of a novel ternary fe⇓w⇓zn alloy: tuning corrosion properties of fe–W based alloys by zn addition 査読有り国際誌

Park J.H., Hagio T., Kamimoto Y., Ichino R.

Journal of the Electrochemical Society 167 巻 ( 13 ) 2020年10月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Electrochemical Society

Herein, we report the electrodeposition of a novel ternary Fe–W–Zn alloy. Ternary alloys with compositions of Fe–(29.08–35.96 at.%) W–(1.73–8.16 at.%) Zn were prepared by potentiostatic deposition in citrate–ammonia aqueous solution equipped with an anode chamber. The electrodeposition behavior of the ternary Fe–W–Zn alloys and the effect of the Zn addition were analyzed by cyclic voltammetry and in situ electrochemical quartz crystal microbalance measurements. Ternary alloys with glossy appearances and smooth surface morphologies were fabricated, with a maximum current efficiency of approximately 43%. Incorporating Zn into the Fe–W alloy structure transformed the alloy structure into an amorphous-like nanocrystalline structure and refined the crystal size to a minimum of 1.45 nm. Potentiodynamic polarization test results showed that the corrosion resistance of the ternary Fe–W–Zn alloy with approximately 2 at.% Zn was distinctly improved compared to the binary Fe–W alloy, both in 1 M H2SO4 solution and neutral 3 mass% NaCl solution. Notably, the corrosion resistance was even better than Ni–W alloy in 1 M H2SO4 solution, with its unique passivation behavior. The incorporation of Zn was found to be effective for tuning the corrosion properties of Fe–W alloys.

DOI： 10.1149/1945-7111/abbe59

Rapid determination of iron concentration in wastewater using color band formation 査読有り国際誌

Imai R., Kamimoto Y., Hagio T., Jung Y.J., Ichino R.

SN Applied Sciences 2 巻 ( 9 ) 2020年9月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SN Applied Sciences

High concentrations of iron ions in water bodies cause odour and discolouration due to their precipitation. The total iron ion concentration is generally analysed on-site by forming coloured compounds and measuring colour intensity with spectrophotometric or visual analysis. In this work, we developed a detection tube as an alternative simple analytical method, where the total iron ion concentration is measured not by colour but by an objective parameter called the colour band length (CBL). Tiron was selected as the colouring agent since it oxidises divalent iron ions into a trivalent state and reacts with trivalent iron ions to form a 3:1 anion complex in alkaline media, giving a red colour. The coloured solution penetrates the detection tube by capillarity, and the colour band is formed by the entrapment of the hydrophobic ion pair of iron-tiron complex and quaternary ammonium ions of the adsorbent filled in the tube. The CBL was found to correlate well with the total iron ion concentration quantitatively under the optimized measurement condition, and 5 to 40 mg-FeL−1 solutions could be measured with good objectivity and precision.

DOI： 10.1007/s42452-020-03331-8

Improvement in corrosion resistance of ternary Zn-Fe-Mo plating by additional Mo-oxide coating 査読有り国際共著国際誌

Park J.H., Kosugi D., Hagio T., Kamimoto Y., Ichino R., Lee M.H.

Surface and Coatings Technology 389 巻 2020年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Surface and Coatings Technology

Despite the excellent corrosion resistance and the widespread application of Zn-Ni plating in industrial fields, the toxicity of Ni to the human body has caused the demand for alternative plating that does not contain harmful elements. In this respect, ternary Zn-Fe-Mo plating, which includes a third element Mo in binary Zn-Fe plating, has been considered as a promising alternative for Zn-Ni plating. In this study, the corrosion resistance of ternary Zn-Fe-Mo plating was evaluated and compared with conventional Zn and Zn-Fe plating by impedance measurements and cyclic corrosion tests (CCT). Furthermore, formation of a multi-layer structure via additional Mo-oxide coating over the ternary Zn-Fe-Mo plating was attempted to increase the corrosion resistance. Experimental results show that ternary Zn-Fe-Mo plating has higher impedance but lower corrosion resistance for CCT and that the Mo-oxide coating significantly enhances the corrosion resistance of the ternary Zn-Fe-Mo plating selectively by a factor of approximately 10. The role of the formation of multi-layer structure in improving the corrosion resistance of the ternary Zn-Fe-Mo plating is discussed through the structure change of the plating and the generated corrosion products.

DOI： 10.1016/j.surfcoat.2020.125567

Selective recovery of indium via continuous counter-current foam separation from sulfuric acid solutions II – Optimization of operational parameters on separation performance 査読有り国際誌

Kinoshita T., Ishigaki Y., Kitagawa S., Ichino R., Kamimoto Y.

Separation and Purification Technology 238 巻 2020年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Separation and Purification Technology

Continuous counter-current foam separation under the simultaneous injections of metal and surfactant solutions into rising foam bed was applied to recover In(III) from a sulfuric acid solution. In this system, an anionic organophosphate surfactant containing a similar structure to a phosphoric acid extractant, D2EHPA, was employed as the metal collector with addition of a nonionic co-surfactant as a foam stabilizer. Among the various commercial products available, A219B/POOE20 was elucidated as the optimum combination of anionic/nonionic surfactants. In this study, the effects of the experimental parameters such as the aqueous pH, air flow rate, and injection rates of metal and surfactant solutions were discussed in terms of the percent recovery and separation factors of In(III) over the other metals. The results were successfully obtained under the optimized conditions with a dose of ascorbic acid as a reductant for Fe(III); the percent recoveries of indium and iron; the separation factors of In/Fe, In/Cu, and In/Zn; and the enrichment ratio of indium were 97%, 1.1%, 93, 1300, 1300, and 5.5, respectively. The mixture mol ratio of mono- and di-esters of anionic A219B was derived as 35:65 by a slope analysis, and the mono-esters would influence the separation performance in the case of rich A219B concentration in foam bed. The performance comparison of this method with solvent extraction using D2EHPA or the conventional foam separation was also presented.

DOI： 10.1016/j.seppur.2019.116490

Development of Synthetic Magnetic Zeolite Adsorbents and Application to Ammonium Ion Removal 査読有り国際共著国際誌

Kamimoto Y., Hagio T., Jung Y.J., Ichino R., Gil K.

KSCE Journal of Civil Engineering 24 巻 ( 5 ) 頁： 1395 - 1399 2020年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：KSCE Journal of Civil Engineering

Synthetic magnetic zeolite with Fe3O4 was developed and its adsorption performance of ammonium ions was examined. The influence of pH levels, Fe3O4 content of the magnetic zeolite, magnetization curve of the magnetic zeolite and isotherm curve were examined in batch type experiments. Magnetic zeolite synthesized by a hydrothermal process was observed with less than 12.6 wt% of Fe3O4 content by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. With the optimum pH level around 8, qe decreases linearly with the increase of Fe3O4 content. Additionally, the adsorption isotherm of ammonium ions is approximated by a Langmuir equation when the maximum adsorption was obtained at about 1.60 mmolg−1. Such processes as the substitution and thermal desorption methods were successfully introduced to regenerate the magnetic zeolite saturated by ammonium ions, which is shown to be easily separated by magnetic force. Thus, the magnetic zeolite is a potential adsorbent for the removal of ammonium ions with an easy separation method using a magnetic process.

DOI： 10.1007/s12205-020-2185-5

Enhancement of corrosion resistance by lamination of Mg film on Zn-55Al-1.6Si-coated steel by physical vapor deposition 査読有り国際共著国際誌

Park J.H., Hagio T., Kamimoto Y., Ichino R., Lee M.H.

Surface and Coatings Technology 387 巻 2020年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Surface and Coatings Technology

Pure Mg films are laminated on hot-dip Zn-55Al-1.6Si-coated steel by physical vapor deposition. Ar gas pressure and deposition time are varied to control the crystal alignment and thickness of the Mg films. Potentiodynamic polarization tests, neutral salt spray tests (SST) and cyclic corrosion tests (CCT) are employed to evaluate the corrosion resistances of Mg laminated Zn-55Al-1.6Si-coated steel. The results show that lamination of Mg films enhance the corrosion resistance, especially against the cross-section by a factor of 2 to 10. The corrosion resistance is significantly affected by Mg film thickness. Polarization test results indicate that corrosion resistance of Mg films is slightly improved by crystal alignment against (101) plane. The effects of Mg films on corrosion process of Zn-55Al-1.6Si-coated steel are investigated via analysis of corrosion products formed during the SST and CCT. Lamination of Mg films seem to hinder the corrosion process by cathodic protection and formation of protective Mg corrosion products at defective areas through Mg ion migration while the underlying Zn-55Al-1.6Si coating protects steel substrate surface. The improvement in corrosion resistance under different corrosion environments of SST and CCT is explained by the transformation of Mg corrosion products from magnesium hydroxide to a more protective hydromagnesite.

DOI： 10.1016/j.surfcoat.2020.125537

Magnetic BEA-type zeolites: preparation by dry-gel conversion method and assessment of dye removal performance 査読有り国際共著国際誌

Phouthavong V., Hiraiwa M., Hagio T., Nijpanich S., Chounlamany V., Nishihama T., Kamimoto Y., Ichino R.

Journal of Material Cycles and Waste Management 22 巻 ( 2 ) 頁： 375 - 382 2020年3月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Material Cycles and Waste Management

The large pores and the rather hydrophobic nature of silica-rich BEA-type zeolites make them promising dye adsorbents. Composites of such zeolites and magnetic particles (magnetic zeolites), commonly prepared using hydrothermal techniques, can be rapidly and reliably removed from treated wastewater through magnetic separation and are therefore more practical than conventional zeolites. However, the incorporation of magnetic particles is difficult to control since it depends greatly on whether the zeolite nucleation occurs in the vicinity of magnetic particles or not. To overcome this problem, we herein synthesize silica-rich magnetic BEA-type zeolites via a different route called dry-gel conversion, namely by exposing a precursor gel containing well-dispersed magnetite to water vapor at 180 °C for 12 h. The obtained samples were characterized by XRD and SEM–EDS and their dye adsorption performance were evaluated using methylene blue as a model. The results indicate that the precursor gel was successfully converted into BEA-type zeolites that contain homogeneously distributed magnetite, exhibit a high methylene blue adsorption capacity (133 mg/g), and can be easily separated by application of a magnetic field. Consequently, this study paves the way to the development of an efficient wastewater treatment technology and thus contributes to the establishment of a green society.

DOI： 10.1007/s10163-020-00994-8

Electrochemical behavior of tungsten carbide-cobalt alloy using molten hydroxide as electrolyte under low temperature 査読有り国際共著国際誌

Kamimoto Y., Kasuga R., Takeshita K., Hagio T., Kuroda K., Ichino R., Deevanhxay P.

Journal of Material Cycles and Waste Management 22 巻 ( 2 ) 頁： 348 - 353 2020年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Material Cycles and Waste Management

Tungsten carbide-cobalt alloys (WC–Cos), which are used for cutting tools, are mainly composed of tungsten carbide and cobalt with minor elements including chromium, tantalum, nickel. Recycling WC–Cos requires a large amount of energy and chemicals for leaching tungsten. We previously showed that tungsten in WC–COs can be leached by potentiostatic electrolysis at − 0.7 V in molten sodium hydroxide (NaOH) at 723 K; tungsten constituted 99.7 mass% of the leached component in the molten salt. In this study, we investigated tungsten leaching at a lower temperature by using a eutectic mixture of 51.5 mol% NaOH and 49.5 mol% potassium hydroxide (KOH) as the electrolyte. Tungsten was leached from the alloy at temperatures above 623 K, which was 100 K lower than the previous study. Cobalt dissolved in the molten salt, although it formed a passive layer. Chromium underwent oxidization and dissolved as a hexavalent ion below 623 K. Tantalum dissolved even without electrolysis. Tungsten was leached at 623 K in this system. Highly purifying tungsten could be obtained by dissolving the cooled molten salt in water and bringing it in contact with air to precipitate other metal ions. Therefore, the electrochemical process is expected to be used for separating tungsten from WC–Cos.

DOI： 10.1007/s10163-019-00962-x

Nickel–carbon composite plating using a Watts nickel electroplating bath 査読有り国際共著国際誌

Kamimoto Y., Okura S., Hagio T., Wada T., Tanaka H., Hara H., Deevanhxay P., Ichino R.

SN Applied Sciences 2 巻 ( 2 ) 2020年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SN Applied Sciences

Metal–carbon composite platings have potential applications in various fields. We previously reported the preparation of nickel–nanocarbon composite platings using a Wood’s bath. The maximum carbon content was 1.2 mass%, but the maximum current efficiency of plating was 12%. The present study focuses on improving the current efficiency of the electroplating process used to prepare nickel–carbon black composites in a Watts bath contained carbon black. The microstructure and carbon content in the nickel plating were evaluated. The current efficiency was greater than 90%, but the carbon content of the composite plating layer was approximately 0.6 mass%. The incorporation of carbon black particles into the plating layer was influenced by the adsorption of particles onto the cathode surface, the supply of particles to the surface, and the electrodeposition rate. The carbon content in the plating layer was highest near the cathode surface and decreased with increasing thickness of the plating layer. The grain size of electrodeposits with carbon black was larger than that of deposits without carbon black. The space between grains was increased with increasing grain size. The corrosion resistance was diminished, indicating that the boundary was the originating point of corrosion.

DOI： 10.1007/s42452-020-1991-1

Development of magnesium–iron layered double hydroxide and application to nitrate removal 査読有り国際共著国際誌

Kamimoto Y., Okamoto N., Hagio T., Yong-Jun J., Deevanhxay P., Ichino R.

SN Applied Sciences 1 巻 ( 11 ) 2019年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SN Applied Sciences

Nitrate is an important ion in agriculture and industry although it is known to cause eutrophication and affect human health. Removal of nitrogen by physicochemical treatment such as sedimentation and membrane separation remains difficult. The selectivity of commercial adsorbents for nitrate is among the lowest for anions, because the selectivity of an adsorbent as an ion exchange resin is based on the valence of the ion. Layered double hydroxide acts as an anion adsorbent, and the target anion adsorbs in the interlayer of cations. In this study, we focused on nitrate adsorption by magnesium-iron layered double hydroxide. The results indicate that the magnesium to iron ratio controlled the interlayer distance. The interlayer distance increased as the magnesium to iron ratio increased. The maximum adsorption capacity for nitrate of 1.80 mmol/g suggests the optimum magnesium to iron ratio is 3. The interlayer distance for a magnesium to iron ratio of 3 is similar in size to that of nitrate. The phosphate inhibition of nitrate adsorption suggests the formation of phosphate compounds on the adsorbent’s surface.

DOI： 10.1007/s42452-019-1240-7

Synthesis of MOR Zeolite/Magnetite Composite via Seed Assisted Method. 査読有り国際共著国際誌

Hagio T, Nijpanich S, Kunishi H, Yamaoka K, Phouthavong V, Kamimoto Y, Ichino R, Iwai K

Journal of nanoscience and nanotechnology 19 巻 ( 10 ) 頁： 6841 - 6848 2019年10月

Electrodeposition of rare-earth elements from neodymium magnets using molten salt electrolysis 査読有り国際誌

Kamimoto Y., Itoh T., Yoshimura G., Kuroda K., Hagio T., Ichino R.

Journal of Material Cycles and Waste Management 20 巻 ( 4 ) 頁： 1918 - 1922 2018年10月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Material Cycles and Waste Management

Rare-earth element is an important target for recycling in Japan. In our previous work, we demonstrated the selective leaching of rare-earth elements from waste neodymium magnets using chloride molten salt electrolysis. In this study, we investigated the electrodeposition of rare-earth elements using liquid metal as a cathode. The reduction potential obtained using a liquid-zinc electrode was higher than that obtained using a solid molybdenum electrode. A zinc–rare-earth alloy was formed as the electrodeposit. The total rare-earth element content of the electrodeposit was more than 99.8 mass% without zinc and other composition of electrolysis. The activity of rare-earth elements decreased upon alloy formation, suggesting that the oxidation rate of electrodeposited alloy will be decreased.

DOI： 10.1007/s10163-017-0682-5

Electrodeposition of copper/carbonous nanomaterial composite coatings for heat-dissipation materials 査読有り国際誌

Goto Y., Kamebuchi Y., Hagio T., Kamimoto Y., Ichino R., Bessho T.

Coatings 8 巻 ( 1 ) 頁： 1-10 2018年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Coatings

Carbonous nanomaterials are promising additives for composite coatings for heat-dissipation materials because of their excellent thermal conductivity. Here, copper/carbonous nanomaterial composite coatings were prepared using nanodiamond (ND) as the carbonous nanomaterial. The copper/ND composite coatings were electrically deposited onto copper substrates from a continuously stirred copper sulfate coating bath containing NDs. NDs were dispersed by ultrasonic treatment, and the initial bath pH was adjusted by adding sodiumhydroxide solution or sulfuric acid solution before electrodeposition. The effects of various coating conditions-the initial ND concentration, initial bath pH, stirring speed, electrical current density, and the amount of electricity-on the ND content of the coatings were investigated. Furthermore, the surface of the NDs was modified by hydrothermal treatment to improve ND incorporation. A higher initial ND concentration and a higher stirring speed increased the ND content of the coatings, whereas a higher initial bath pH and a greater amount of electricity decreased it. The electrical current density showed a minimum ND content at approximately 5 A/dm2. Hydrothermal treatment, which introduced carboxyl groups onto the ND surface, improved the ND content of the coatings. A copper/ND composite coating with a maximum of 3.85 wt % ND was obtained.

DOI： 10.3390/coatings8010005

Effect of the addition of molybdenum on the structure and corrosion resistance of zinc-iron plating 査読有り国際誌

Kosugi D., Hagio T., Kamimoto Y., Ichino R.

Coatings 7 巻 ( 12 ) 2017年12月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Coatings

Zn-Ni plating is indispensable in various industries because of its high corrosion resistance. However, Ni has been reported to trigger allergies; thus, an alternative Ni-free plating is desired. Zn-Fe plating is considered to be a promising candidate, albeit its corrosion resistance still needs to be improved. The corrosion resistance of Zn-Fe plating is expected to increase by the addition of Mo as the third alloying element as it is more noble than Zn and Fe. In this study, Zn-Fe-Mo plating with a corrosion resistance nearly equivalent to that of the Zn-Ni plating was fabricated. Zn-Fe-Mo plating was electrically deposited from continuously-agitated plating baths prepared by mixing ZnSO 4 , FeSO 4 , Na 2 MoO 4 , Na 3 C 6 H 5 O 7 , and Na 2 SO 4 using Fe or Ni plates as the substrate. The surface morphology, composition, crystal phase, and electronic state of Mo of the platings were investigated by scanning electron microscopy equipped with energy-dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion performance was evaluated by Tafel extrapolation method. Formation of plating comprising a Mo containing alloy phase was found to be crucial for improving corrosion resistance. The Zn-Fe-Mo plating demonstrates promise for replacing anti-corrosion Zn-Ni platings.

DOI： 10.3390/coatings7120235

Recovery of rare-earth elements from neodymium magnets using molten salt electrolysis 査読有り国際誌

Kamimoto Y., Itoh T., Kuroda K., Ichino R.

Journal of Material Cycles and Waste Management 19 巻 ( 3 ) 頁： 1017 - 1021 2017年7月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Material Cycles and Waste Management

Rare-earth elements are used in neodymium magnets, and these elements are critical to Japanese industry. In this study, we focused on the electrochemical behavior of neodymium magnets for the recovery of rare-earth elements using molten salt electrolysis. The influence of the rare-earth elemental composition of the neodymium magnets on their anodic polarization behavior and oxidation mechanism was studied. The use of potentiostatic electrolysis enabled selective leaching of rare-earth elements from neodymium magnets in the potential range from −1.8 to −0.8 V. The oxidation potential limits the oxidation stage, enabling rare-earth elements to be leached from mixed neodymium magnets simultaneously.

DOI： 10.1007/s10163-016-0563-3

Phosphorus removal and magnetic separation using magnetic schwertmannite 査読有り国際共著国際誌

Kamimoto Y., Yamauchi K., Hagio T., Ichino R., Min K.S., Kwon K.H., Kim Y.J., Jung Y.J.

Desalination and Water Treatment 63 巻頁： 463 - 468 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Desalination and Water Treatment

Phosphorus is an eutrophication agent for aquatic environment. An adsorption method is used for phosphorus removal; however, solid–liquid separation of adsorbent and the limit of adsorption relative to particle size are problematic. This study focused on phosphorus removal using schwertmannite combined with magnetite (magnetic schwertmannite). Magnetite is a ferromagnetic material. The magnetic schwertmannite with more than 33.7 mass% of magnetite content demonstrated good magnetic separation. The optimum adsorption pH was found to be 2.5, and the adsorption amount decreased with increase in solution pH. The maximum adsorption amount for phosphate was observed to be 1.42 mmol/g, and the adsorption isotherm was approximated by the Langmuir equation. The maximum adsorption amount was more than twice that previously reported because the particle size used in the current study was smaller than that used previously.

DOI： 10.5004/dwt.2017.11452

Removal properties of phosphate with ettringite 査読有り国際共著国際誌

Kamimoto Y., Onda K., Ichino R., Min K.S., Kwon K.H., Jung Y.J.

Desalination and Water Treatment 63 巻頁： 478 - 482 2017年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Desalination and Water Treatment

This work has performed the feasibility of utilizing synthetic ettringite as an adsorbent for phosphate removal in lab-scale experiments. Studies were focused on the influence of solution pH for the removal properties of phosphate. Ettringite was stable in the alkaline condition, and it was quickly decomposed in acid condition. Calcium and aluminum compound was formed at each pH condition. Phosphate removal performance was increased with the increase of solution pH. It was shown that the phosphate removal mechanism was influenced not only ion-exchange but also phosphate compound formation. The inside of large size ettringite residue was kept ettringite structure, and the phosphate was removed by ettringite surface only.

DOI： 10.5004/dwt.2017.11454

Ti<inf>3</inf>AlC<inf>2</inf> MAX Phase: A surprising candidate material for highly selective and efficient gold recovery from strong acid solutions 査読有り国際共著国際誌

Thaveemas P., Phouthavong V., Hagio T., Dechtrirat D., Chuenchom L., Nijpanich S., Chanlek N., Park J.H., Ichino R.

Separation and Purification Technology 343 巻 2024年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Separation and Purification Technology

Given the scarcity of natural gold sources and associated mining challenges, the recovery of gold from secondary sources, such as electronic equipment waste (e-waste), becomes imperative. E-waste is typically treated with aqua regia to obtain highly acidic gold-containing solutions, which are subsequently processed by various methods to recover gold. Gold recovery materials offer numerous benefits but often exhibit insufficient selectivity, efficiency, and cost-effectiveness. To address this problem, we herein used a nonmodified pristine Ti-Al-C MAX phase (Ti3AlC2) to realize the one-pot room-temperature recovery of gold from highly acidic solutions (pH < 1) in the form of easily collectable bulky ball-shaped Au0 aggregates. High gold selectivity (Kd = 2.03 × 106 mL/g) and extraction efficiency (∼99 %) were observed even in the presence of interfering metal ions (Pd2+, Pt4+, Co2+, Ni2+, Cu2+, Zn2+), and the maximum gold extraction capacity (>6000 mg/g) surpassed that of previously reported gold recovery materials. The recovered gold was highly pure (>90 mass%) and contained minimal amounts of the original MAX phase, which obviated the need for intensive postpurification. The results of instrumental analyses suggested that gold recovery relied on electron transfer, similar to cementation, and primarily involved the reduction of solution-phase Au3+ to Au0 via electron transfer from the Ti and Al of Ti3AlC2. Thus, our work demonstrates the significant potential of pristine Ti3AlC2 for the energy-efficient recovery of gold from highly acidic solutions and paves the way for the efficient valorization of e-waste.

DOI： 10.1016/j.seppur.2024.127113

Removal of heavy metals by BEA zeolite/Fe<inf>3</inf>O<inf>4</inf> composite prepared via dry-gel conversion method using agrowaste-derived raw material 査読有り国際共著

Phouthavong V., Hagio T., Park J.H., Nijpanich S., Duangkhai K., Rujiravanit R., Thaveemas P., Chounlamany V., Kong L., Li L., Ichino R.

Solid State Sciences 149 巻 2024年3月

担当区分：最終著者記述言語：英語出版者・発行元：Solid State Sciences

Using agrochemicals are considered as an anthropogenic source of heavy metal contamination in water, and ecofriendly remediation tools for removal is desired. Here, we demonstrate material circulation by converting SiO2 extracted from agrowaste: rice husk ash, into an easily collectable adsorbent: BEA zeolite/Fe3O4 composite, through dry-gel conversion technique. In addition, the synthesized BEA zeolite/Fe3O4 composite was tested for removal of heavy metals for the first time. Instrumental analyses confirmed that incorporated Fe3O4 particles inside BEA zeolites showed no severe effects on its morphologies. Pseudo-second order kinetic and Langmuir isotherm models were found best described the adsorption of three typical toxic heavy metals: Pb(II), Cu(II), Zn(II). Moderate adsorption capacities of 0.675, 0.310, and 0.308 mmol/g for Pb(II), Cu(II), and Zn(II), respectively, following the selectivity order: Pb(II) > Cu(II) ≈ Zn(II) were obtained. The composite adsorbent exhibits magnetic collectability, reusability and stability, indicating its practicality for removal of heavy metals from water.

DOI： 10.1016/j.solidstatesciences.2024.107473

Super hardening of Fe–W alloy plating by phase transformation of amorphous to metal carbides-dispersed nanocrystalline alloys and application as promising alternative for hard chromium plating 査読有り

Park J.H., Kim J.I., Shinohara Y., Hagio T., Umehara N., Ichino R.

Surface and Coatings Technology 477 巻 2024年2月

担当区分：最終著者記述言語：英語出版者・発行元：Surface and Coatings Technology

Despite the superior hardness, wear resistance, and corrosion resistance of hard chromium (Cr) plating using toxic hexavalent chromium (Cr6+), the gradual restriction on the use of Cr6+ in industrial fields necessitates the development of an alternative, harmless plating material with excellent performance. Here, we report the fabrication of super-hard plating by the simple annealing of electrodeposited Fe–W–C plating as a promising alternative for hard Cr plating. Amorphous-structured Fe–W–C plating, including co-deposited citric acid-derived carbon, forms uniformly dispersed ternary metal carbides inside the plating during annealing, which changes the plating structure from amorphous to nano-carbide-dispersed alloys. The phase-transformed, nanocrystalline Fe–W–C alloy annealed at 700 °C exhibited a maximum hardness of 20.5 GPa, which surpassed the hardness of hard Cr plating (12.5 GPa). The ball-on-disc tribo-test and corrosion test results further demonstrated the superior wear and anti-corrosion properties of the carbide-dispersed Fe–W–C alloy plating compared with hard Cr plating. This study develops the applicability of this super-hard plating as a new hard coating material that overcomes the limitations of conventional metal plating without using any toxic chemical.

DOI： 10.1016/j.surfcoat.2024.130388

c面配向六方晶酸化タングステン膜の分子ふるい型分離膜としての可能性査読有り国際共著国際誌

萩尾健史, 國司寛人, 和田慎太郎, 寺尾年弘, 木下空, プッタヴーンワンパサート, ニッチパーニッチスーピンヤー, パクジェヒョク, 市野良一

ゼオライト 41 巻 ( 1 ) 頁： 9 - 19 2024年1月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本ゼオライト学会

カーボンニュートラルおよび持続可能な社会の実現に向け，エネルギー消費の大きい分離プロセスの省エネルギー化や資源循環に貢献する分離膜は益々注目されている。その中で，膜材料の検討は分離特性を決定づける重要な研究要素の一つである。分子サイズのミクロ細孔を有する無機結晶（ミクロ多孔無機結晶）は分子ふるいとも呼ばれる有望な分離膜材料である。筆者らは，この分子ふるい型膜材料として新たに六方晶酸化タングステンの可能性を提案してきた。同材料は，結晶のc軸と並行な一軸細孔を有するため，そのc面配向膜は分子ふるい型分離膜として機能すると予想されるが，分離膜材料としては検討されてこなかった。本稿では，筆者らが種々の対策によって緻密なc面配向六方晶酸化タングステン膜の合成に挑戦し，液分離並びにガス分離への適用可否を検討した結果を紹介する。得られた膜は，水／酢酸の混合溶液から水を選択的に分離できることが確認された。また，各種液およびガス分子の透過特性を調査した結果，ミクロ細孔を利用した小分子向けの分子ふるい型分離膜として機能するであろうことを見出した。本発見は膜材料の選択肢拡大に寄与すると期待される。

DOI： 10.20731/zeoraito.41.1.9

Facile Synthesis of Spherical Porous Tricobalt Tetroxide and Metal Cobalt for High Quality Cobalt Production and Recycling 査読有り

Matsunaga S., Suzuki T., Hagio T., Park J.H., Kamimoto Y., Ichino R., Takeshita K., Sato F., Sasaya K., Iguchi T., Tsunekawa M.

MATERIALS TRANSACTIONS 64 巻 ( 12 ) 頁： 2739 - 2747 2023年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本金属学会

Liquid-phase synthesis is suitable for controlling the morphological and structural properties of functional inorganic materials and such control is important because they strongly affect the functionality of the product. Cobalt-based materials is one group of materials that requires control of powder morphology and structure. Cobalt is an important metal element used in various industrial fields such as secondary batteries, superalloys, permanent magnets, hard metals, and catalysts. The ever-growing demand of cobalt highlights that there is an urgent necessity to develop high quality material synthesis methods and to secure cobalt resources for countries that rely on import like Japan. Especially, technologies to recycle cobalt in a form reusable for secondary batteries and catalysts are desired because further increase in demand is anticipated. Meanwhile, spherical porous tricobalt tetroxide secondary particles obtained by calcination of spherical cobalt carbonate precursors have been reported to be promising materials for battery applications. Moreover, porous metal cobalt obtained by hydrogen reduction of tricobalt tetroxide is known to be effective for catalyst applications. However, conventional methods to synthesize spherical cobalt carbonate requires addition of additives in the reaction mixtures or otherwise requires hydrothermal treatment in pressure vessels. These are unfavorable to develop a practical and sustainable process for cobalt-based material production and recycling. In this study, a facile room temperature synthesis method to prepare spherical cobalt carbonate precursors from solutions of cobalt chloride and ammonium hydrogen carbonate that does not require any additives or hydrothermal treatment is developed by optimizing the carbonate solution concentration, carbonate/cobalt salt molar ratio, and stirring time during reaction. Furthermore, we succeeded in obtaining porous tricobalt tetroxide and porous metal cobalt that carry on the exterior spherical morphology of the original cobalt carbonate precursor by calcination and hydrogen reduction. The developed process shall contribute to realize high quality cobalt-based material production and recycling.

DOI： 10.2320/matertrans.m-m2023809

AC Electromagnetic Field Controls the Biofilms on the Glass Surface by Escherichia coli & Staphylococcus epidermidis Inhibition Effect 査読有り

Aoyama N., Kanematsu H., Barry D.M., Miura H., Ogawa A., Kogo T., Kawai R., Hagio T., Hirai N., Kato T., Yoshitake M., Ichino R.

Materials 16 巻 ( 21 ) 2023年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Materials

Biofilms, mainly comprised of bacteria, form on materials’ surfaces due to bacterial activity. They are generally composed of water, extracellular polymeric substances (polysaccharides, proteins, nucleic acids, and lipids), and bacteria. Some bacteria that form biofilms cause periodontal disease, corrosion of the metal materials that make up drains, and slippage. Inside of a biofilm is an environment conducive to the growth and propagation of bacteria. Problems with biofilms include the inability of disinfectants and antibiotics to act on them. Therefore, we have investigated the potential application of alternating electromagnetic fields for biofilm control. We obtained exciting results using various materials’ specimens and frequency conditions. Through these studies, we gradually understood that the combination of the type of bacteria, the kind of material, and the application of an electromagnetic field with various low frequencies (4 kHz–12 kHz) changes the circumstances of the onset of the biofilm suppression effect. In this study, relatively high frequencies (20 and 30 kHz) were applied to biofilms caused by Escherichia coli (E. coli) and Staphylococcus epidermidis (S. epidermidis), and quantitative evaluation was performed using staining methods. The sample surfaces were analyzed by Raman spectroscopy using a Laser Raman spectrometer to confirm the presence of biofilms on the surface.

DOI： 10.3390/ma16217051

Gas permeation properties of c-plane aligned hexagonal tungsten oxide membranes formed by multi-stage synthesis 査読有り国際共著国際誌

Wada S., Hagio T., Kunishi H., Park J.H., Phouthavong V., Yamada Y., Terao T., Li X., Nijpanich S., Ichino R.

Journal of the Korean Ceramic Society 60 巻 ( 6 ) 頁： 967 - 978 2023年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Korean Ceramic Society

Crystalline microporous membranes are promising tools for gas separation because their molecular dimension pores allow us to accurately sieve molecules by size. Recently, microporous hexagonal WO3 was reported as a new potential membrane material and its membrane was found to enable separation of water from water/acetic acid mixtures. Pore size of hexagonal WO3 seemed to be also suitable for separation of small gasses; however, its gas permeation properties have not been reported. Additionally, densification of membranes by decreasing intercrystalline gaps are extremely important in gas separation. One effective method to densify polycrystalline membranes is to repeat membrane synthesis, namely multi-stage synthesis. Here, we attempt to prepare dense hexagonal WO3 membranes on porous tubular supports by multi-stage synthesis and examined their densification and gas permeation properties. Densification was confirmed by permeation of SF6 (gas molecule larger than pores of hexagonal WO3), and its potential for separating small gasses was considered from single gas permeation of He and He/SF6 permselectivity. The results indicated that the multi-stage synthesis is effective to densify the membranes and He/SF6 permselectivity reached 42.8 for three-stage synthesis under modified conditions, implying hexagonal WO3 is a potential membrane material for small gas separation.

DOI： 10.1007/s43207-023-00321-5

Synthesis of Sulfur-Doped Magnetic Iron Oxides for Efficient Removal of Lead from Aqueous Solutions 査読有り国際共著

Xu J., Pan M., Zou C., Huang X., Hagio T., Ichino R., Kong L., Li L.

Water (Switzerland) 15 巻 ( 20 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Water (Switzerland)

Heavy metal pollution poses an environmental risk, and its efficient removal and facile separation from water remains a challenge. Magnetic iron oxide, an eco-friendly, relatively stable, and easy-separation material, has been regarded as one of the most applicable adsorbents for water treatment. However, the limited adsorption capacity has restricted its applications. Herein, sulfur-doped magnetic Fe3O4 (Sx–Fe3O4) adsorbent was fabricated using a calcination method for the efficient removal of Pb(II) from water. In contrast to undoped Fe3O4, the introduction of doped sulfur greatly enhanced the adsorption performance of S–Fe3O4 over four times, with a maximum capacity of 333.33 mg g−1, which was synthesized at 300 °C with a raw molar ratio of S–Fe of 5. Based on the structure and morphology analysis, it was demonstrated that sulfur was successfully doped into the Fe3O4 structures, which resulted in Fe3O4 with active sulfur sites accordingly contributing to the adsorption enhancement through the combination of strong soft–soft interactions between soft base sulfur and soft acid Pb(II) along with surface adsorption. Sx–Fe3O4 could maintain the adsorption performance in the presence of competing ions. Furthermore, although the sulfur doping process exhibited slight side effects on the magnetic property, magnetic Sx–Fe3O4 maintained the high separation potential. This study presented a promising strategy to enhance the adsorption performance of Fe3O4 through sulfur doping for Pb(II) removal from water.

DOI： 10.3390/w15203667

Preparation and Characterization of TiO<inf>2</inf>-Coated Hollow Glass Beads for Functionalization of Deproteinized Natural Rubber Latex via UVA-Activated Photocatalytic Degradation 査読有り

Nijpanich S., Nimpaiboon A., Rojruthai P., Park J.H., Hagio T., Ichino R., Sakdapipanich J.

Polymers 15 巻 ( 19 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Polymers

The photochemical degradation of natural rubber (NR) is a prevalent method used to modify its inherent properties. Natural rubber, predominantly derived from the Hevea Brasiliensis tree, exhibits an exceptionally high molecular weight (MW), often reaching a million daltons (Da). This high MW restricts its solubility in various solvents and its reactivity with polar compounds, thereby constraining its versatile applications. In our previous work, we employed TiO2 in its powdered form as a photocatalyst for the functionalization of NR latex. However, the post-process separation and reuse of this powder present substantial challenges. In this present study, we aimed to functionalize deproteinized NR (DPNR) latex. We systematically reduced its MW via photochemical degradation under UVA irradiation facilitated by H2O2. To enhance the efficiency of the degradation process, we introduced TiO2-coated hollow glass beads (TiO2-HGBs) as photocatalysts. This approach offers the advantage of easy collection and repeated reuse. The modified DPNR showed a reduction in its number-average MW from 9.48 × 105 to 0.28 × 105 Da and incorporated functional groups, including hydroxyl, carbonyl, and epoxide. Remarkably, the TiO2-HGBs maintained their performance over seven cycles of reuse. Due to their superior efficacy, TiO2-HGBs stand out as promising photocatalysts for the advanced functionalization of NR across various practical applications.

DOI： 10.3390/polym15193885

Improvement in the corrosion resistance of electrodeposited Ni-W alloy by MWCNT co-deposition and prevention of metal-carbon interfacial corrosion by carbide formation 査読有り

Park J.H., Hagio T., Ichino R.

Journal of Alloys and Compounds 939 巻 2023年4月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Alloys and Compounds

Composite plating is an effective method which can enhance the properties of conventional metal plating by co-deposition of composite materials. In this study, multi-walled carbon nanotubes (MWCNTs) were used as a composite material to improve the corrosion resistance of Ni-W alloys, and the effect of the MWCNTs addition on the anti-corrosion properties was discussed. The corrosion current density of the Ni-W/MWCNTs composite decreased approximately 4 times from 16.6 to 4.6 μA·cm-2 in 3 wt% NaCl solution compared to the pristine Ni-W; this showed that the co-deposition of MWCNTs was effective for improvement in the corrosion resistance. However, the interfacial corrosion between the metal matrix and MWCNTs occurred in the high potential region and degraded the passivation properties of plating. This interfacial corrosion is caused by the high O content due to the hydroxyl groups on the acid-treated MWCNTs surface and the difference in W concentration between the interface of MWCNTs and the Ni-W matrix. Heat treatment in Ar atmosphere removes these hydroxyl groups and diffuses Ni and W into MWCNTs to form metal carbide (Ni6W6C), effectively alleviating interfacial corrosion. This study presents interfacial corrosion can be effectively mitigated by forming metal carbides at the interface of carbon materials in metal/carbon composites.

DOI： 10.1016/j.jallcom.2023.168788

Dry-gel conversion synthesis of magnetic BEA-type zeolites for antibiotics adsorption 査読有り国際共著

Phouthavong V., Hagio T., Nijpanich S., Park J.H., Hiraiwa M., Srihirunthanon T., Chantanurak N., Rujiravanit R., Kamimoto Y., Li X., Kong L., Li L., Ichino R.

Journal of Sol-Gel Science and Technology 105 巻 ( 2 ) 頁： 511 - 524 2023年2月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Sol-Gel Science and Technology

The dry-gel conversion method (DGC) is a promising synthesis protocol for preparing magnetic zeolite composites as it yields homogeneous composite particles with more rapid crystallization, smaller reactor volume, and less waste production than the conventional hydrothermal method. This work investigates the optimal conditions for preparing magnetic BEA-type zeolites using the DGC method, including the gel/water ratio, crystallization temperature and time. Precursor dry-gel incorporating well-dispersed magnetite was subjected to crystallization under water vapor atmosphere with a gel/water ratio of 0.5–2, crystallization temperature of 140–200 °C for 1.5–12 h, followed by characterization using X-ray diffraction and scanning electron microscopy. The optimum conditions were found to be gel/water ratio of 1 and crystallization at 180 °C for 12 h. Magnetic properties of collected samples were evaluated using a vibrating-sample magnetometer after calcination at 400–500 °C for 12 h. Products calcined below 450 °C showed good magnetic properties. Adsorption of sulfadiazine using the BEA and magnetic BEA-type zeolites was evaluated in a 10–50 mg/l range. Results revealed favorable multilayer-type adsorption of sulfadiazine onto both non-magnetic and magnetic BEA-type zeolites (Freundlich model). These indicate that DGC method is suitable for preparing high-silica magnetic BEA-type zeolites with potential for antibiotic removal. Graphical Abstract: [Figure not available: see fulltext.].

DOI： 10.1007/s10971-022-06025-2

Aluminum Electrodeposition on the Surface of Boron Carbide Ceramics by Use EMIC–AlCl<inf>3</inf> Ions Liquid 査読有り

Gou R., Park J.H., Yamashita S., Hagio T., Ichino R., Kita H.

Coatings 12 巻 ( 10 ) 2022年10月

記述言語：英語出版者・発行元：Coatings

Coating technology is decisively important for metallization of ceramic materials and ceramic metal sealing technology. Previous studies have shown that the network-like structure after penetration of molten aluminum can significantly improve the strength of joint components. However, the direct aluminum coating method is limited by the shape of the substrate. To obtain a dense aluminum film on the surface of B4C, in this study, aluminum was deposited by pulse electroplating in EMIC–AlCl3 ionic liquid. The deposited metals were observed and analyzed by SEM–EDS and XRD. A Vickers hardness tester was adopted as an auxiliary equipment to clarify the film quality. The results show that frequency and duty cycle have significant effects on crystal orientation. The content of oxides in the contact gap reduces the bonding strength of the deposited metal, which provides experimental basis for metal electrodeposition on B4C.

DOI： 10.3390/coatings12101535

Facile synthesis of amine-functionalized three-dimensional graphene composites for CO2 capture 査読有り国際共著

Sun Hefei, Zhang Qinggang, Hagio Takeshi, Ryoichi Ichino, Kong Long, Li Liang

SURFACES AND INTERFACES 33 巻 2022年10月

Amine-Modified Small Pore Mesoporous Silica as Potential Adsorbent for Zn Removal from Plating Wastewater 査読有り

Phouthavong V., Park J.H., Nishihama T., Yoshida S., Hagio T., Kamimoto Y., Ichino R.

Coatings 12 巻 ( 9 ) 2022年9月

担当区分：最終著者記述言語：英語出版者・発行元：Coatings

The removal of Zn from wastewater generated from the Zn-based electroplating manufacturing process is essential because the regulation limit of Zn concentration in wastewater is becoming stricter in Japan. However, achieving this through conventional methods is difficult, especially for small and medium enterprises in the plating industry. Therefore, a suitable Zn-removal method with a low cost but high performance and Zn selectivity is required. The application of adsorbents is one possible solution. Mesoporous silica (MS) is a well-known adsorbent with controllable pore size, high specific surface area (SSA), high acid resistance, and ease of surface modification. In this study, we modified the surfaces of MSs with different initial pore sizes by amino groups and investigated their Zn removal performances. The effect of pore size on amine modification using (3-aminopropyl)triethoxysilane and on adsorption performance in a single system was investigated along with Zn adsorption selectivity in the Zn–Ni binary system. Amine-modified MS prepared from MS with an initial pore size of 1.9 nm showed drastically lower performance compared to those prepared from MS with an initial pore size larger than 2.8 nm. Zn-selectivity in the Zn–Ni binary system, containing equal amounts of Zn and Ni, was found to reach a maximum of 21.6 when modifying MS with an initial pore size of 2.8 nm.

DOI： 10.3390/coatings12091258

Effect of Zn-Mg interlayer on the corrosion resistance of multilayer Zn-based coating fabricated by physical vapor deposition process 査読有り国際共著

Park J.H., Ko K.P., Hagio T., Ichino R., Lee M.H.

Corrosion Science 202 巻 2022年7月

記述言語：英語出版者・発行元：Corrosion Science

A novel Zn/Zn-Mg/Zn multilayer coating is prepared on steel plate by PVD. The effect of the multilayer structure comprising Zn-Mg interlayer on the corrosion resistance is discussed. The corrosion resistance is evaluated by the salt spray test, and the corrosion progression is analyzed by electrochemical impedance spectroscopy and corrosion products observation. Eluted Mg ions from the Zn-Mg interlayer form a porous Mg corrosion product layer that permeates chlorine ions, assists the coating transform to Zn5(OH)8Cl2·H2O phase. Improved corrosion resistance of the coating can be explained by the rapid increasement of the impedance by the formation of the protective Zn5(OH)8Cl2·H2O phase.

DOI： 10.1016/j.corsci.2022.110330

Electrodeposition of Amorphous Molybdenum Oxide on Iron-Group Element Based Plating and its Novel Application as a Corrosion Protective Coating 査読有り国際共著

Park J.H., Hagio T., Nijpanich S., Chanlek N., Chaiprapa J., Songsiriritthigul C., Songsiriritthigul P., Ichino R.

Journal of the Electrochemical Society 169 巻 ( 7 ) 2022年7月

記述言語：英語出版者・発行元：Journal of the Electrochemical Society

The corrosion resistance of materials composed of metal is an essential property for preventing material deterioration caused by corrosion. In this study, we demonstrate that corrosion resistance can be significantly improved through the electrodeposition of molybdenum oxide onto a metal plating containing iron-group elements. Mo oxide can be electrodeposited using a simple plating bath, low current density, and short deposition time, exhibiting a fascinating metallic gloss appearance. GI-XRD and XPS analyses revealed that amorphous Mo oxide adhered to the substrate by a seed layer partially reduced to metallic Mo by the iron-group element in the substrate, based on the principle of "induced co-deposition."A Mo oxide coating with a thickness of approximately 100 nm decreases the corrosion current density of Ni-W plating by approximately 5 times and the passivation current density by approximately 10 times in a 3 mass% NaCl solution. Mo oxide coatings represent an attractive strategy for improving the corrosion resistance of various metal materials containing iron-group elements.

DOI： 10.1149/1945-7111/ac7e78

Simultaneous reduction and sequestration of hexavalent chromium by magnetic β-Cyclodextrin stabilized Fe<inf>3</inf>S<inf>4</inf> 査読有り国際共著国際誌

Kong L., Yan R., Liu M., Xu J., Hagio T., Ichino R., Li L., Cao X.

Journal of Hazardous Materials 431 巻頁： 128592 2022年6月

A tri-layer floating photocatalyst/adsorbent for the removal of organic compounds from wastewater: Layer-by-layer deposition of silicalite-1 and titania on hollow glass microspheres 査読有り国際共著国際誌

Nijpanich S., Hagio T., Murase K., Park J.H., Kamimoto Y., Sakdapipanich J., Terashima C., Chanlek N., Ichino R.

Environmental Technology and Innovation 26 巻 2022年5月

Impedance Characteristics of Monolayer and Bilayer Graphene Films with Biofilm Formation and Growth 査読有り国際共著

Nakagawa R., Saito K., Kanematsu H., Miura H., Ishihara M., Barry D.M., Kogo T., Ogawa A., Hirai N., Hagio T., Ichino R., Ban M., Yoshitake M., Zimmermann S.

Sensors 22 巻 ( 9 ) 2022年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Sensors

Biofilms are the result of bacterial activity. When the number of bacteria (attached to materials’ surfaces) reaches a certain threshold value, then the bacteria simultaneously excrete organic polymers (EPS: extracellular polymeric substances). These sticky polymers encase and protect the bacteria. They are called biofilms and contain about 80% water. Other components of biofilm include polymeric carbon compounds such as polysaccharides and bacteria. It is well-known that biofilms cause various medical and hygiene problems. Therefore, it is important to have a sensor that can detect biofilms to solve such problems. Graphene is a single-atom-thick sheet in which carbon atoms are connected in a hexagonal shape like a honeycomb. Carbon compounds generally bond easily to graphene. Therefore, it is highly possible that graphene could serve as a sensor to monitor biofilm formation and growth. In our previous study, monolayer graphene was prepared on a glass substrate by the chemical vapor deposition (CVD) method. Its biofilm forming ability was compared with that of graphite. As a result, the CVD graphene film had the higher sensitivity for biofilm formation. However, the monolayer graphene has a mechanical disadvantage when used as a biofilm sensor. Therefore, for this new research project, we prepared bilayer graphene with high mechanical strength by using the CVD process on copper substrates. For these specimens, we measured the capacitance component of the specimens’ impedance. In addition, we have included a discussion about the possibility of applying them as future sensors for monitoring biofilm formation and growth.

DOI： 10.3390/s22093548

光触媒を用いたダイヤモンドのアミノ基修飾と銅基質に対する高分散複合化技術査読有り

加藤華月, 石田直哉, 鈴木孝宗, 藤本憲次郎, 萩尾健史, 市野良一, 近藤剛史, 湯浅真, 上塚洋, 藤嶋昭, 寺島千晶

表面技術 72 巻 ( 12 ) 頁： 701 - 703 2021年12月

Preparation of amino group functionalized diamond using photocatalyst and thermal conductivity of diamond/copper composite by electroplating 査読有り国際誌

Diamond and Related Materials 118 巻 2021年10月

Evenly distribution of amorphous iron sulfides on reconstructed Mg-Al hydrotalcites for improving Cr(VI) removal efficiency 査読有り国際共著国際誌

Yan R., Feng X., Kong L., Wan Q., Zheng W., Hagio T., Ichino R., Cao X., Li L.

Chemical Engineering Journal 417 巻 2021年8月

Electroplating of copper/microdiamond composites and the effect of diamond surface functionalization 査読有り国際誌

Functional Materials Letters 14 巻 ( 5 ) 2021年7月

Effect of SiC formation temperature on improvement in thermal conductivity of electrodeposited SiC-coated diamond/Cu composite plating 査読有り国際誌

Naruse Yuto, Park Jae-Hyeok, Hagio Takeshi, Kamimoto Yuki, Bessho Takeshi, Ryoichi Ichino

COMPOSITE INTERFACES 29 巻 ( 3 ) 2021年6月

The effect of bath pH on electrodeposition and corrosion properties of ternary Fe-W-Zn alloy platings 査読有り国際誌

Journal of Solid State Electrochemistry 25 巻 ( 6 ) 頁： 1901 - 1913 2021年6月

Band Gap Engineering toward Wavelength Tunable CsPbBr<inf>3</inf>Nanocrystals for Achieving Rec. 2020 Displays 査読有り国際共著国際誌

Chemistry of Materials 33 巻 ( 10 ) 頁： 3575 - 3584 2021年5月

Electrodeposition of ni-w/cnt composite plating and its potential as coating for pemfc bipolar plate

Park J.H., Wada T., Naruse Y., Hagio T., Kamimoto Y., Ryoichi I.

Coatings 10 巻 ( 11 ) 頁： 1 - 14 2020年11月

記述言語：日本語出版者・発行元：Coatings

In this study, Ni-W/carbon nanotube (CNT) composite platings are electrodeposited onto steel plate as a possible coating material for the polymer electrolyte membrane fuel cell (PEMFC) bipolar plate, which requires high corrosion resistance under acidic environment and low contact resistance. The dispersibility of CNT in the plating bath is improved by surface modification of CNT through hydrothermal treatment in mixed acid solution. The change in electrodeposition behavior of Ni-W plating by CNT addition is investigated by cathodic polarization measurement. The corrosion resistance under acidic environment is evaluated using 0.5M H2 SO4 solution and contact resistance of the composite platings is measured and compared with Ni and Ni-W plating. The surface modification of CNT through hydrothermal treatment is found to increase the CNT content in the Ni-W/CNT composite plating up to 0.33 mass.% and sufficient incorporation of hydrothermally treated CNT in Ni-W plating results in low contact resistance and enhanced corrosion resistance than pristine Ni-W plating.

DOI： 10.3390/coatings10111095

Floating Adsorbent for Organic Removal Fabricated Through Crystallization of Silicalite-1 on Hollow Glass Microspheres 査読有り国際誌

Nijpanich Supinya, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

SCIENCE OF ADVANCED MATERIALS 12 巻 ( 2 ) 頁： 173 - 179 2020年2月

Investigation on Strontium Adsorption Selectivity of Hydrothermally Synthesized Layered Sodium Titanates 査読有り国際誌

Kunishi Hiroto, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

SCIENCE OF ADVANCED MATERIALS 12 巻 ( 2 ) 頁： 186 - 190 2020年2月

Evaluation of the Interactions Between Palladium(Ⅱ) and N,N'-Dimethyl-N,N'-di-n-hexyl-thiodiglycolamide in the Presence of Surfactants Using Capillary Electrophoresis 査読有り国際誌

Tanaka Nana, Kitagawa Shinya, Ohtani Hajime, Iwama Yuki, Kondo Koichiro, Ishigaki Yuzo, Shibata Nobuyuki, Kinoshita Takehiko, Kamimoto Yuki, Ichino Ryoichi

CHROMATOGRAPHY 40 巻 ( 2 ) 頁： 59 - 63 2019年6月

Preparation of a floating photocatalyst via electroless Ni-P-TiO2 composite plating on polypropylene balls for wastewater treatment 査読有り国際共著国際誌

Nijpanich S., Kamimoto Y., Hagio T., Ichino R.

Journal of Water and Environment Technology 17 巻 ( 3 ) 頁： 131 - 140 2019年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本水環境学会

Application of photocatalysts is among the most promising methods to eliminate organic pollutants in wastewater. A photocatalytic reaction, which involves the generation of reactive radicals from the reaction on the photocatalyst's surface and their interaction with organic molecules, can degrade organic pollutants. Titanium dioxide (TiO2) is a well-known photocatalyst because it has low toxicity and cost including high chemical stability. However, it cannot be efficiently activated in water because of the difficulty in adsorbing ultraviolet light. In this work, a floating photocatalyst was prepared by combining TiO2, Ni-P plating, and a polypropylene (PP) hollow ball substrate. An Ni-P coating was electrolessly deposited on the PP hollow ball in the presence of TiO2. The prepared photocatalyst was characterized using X-ray diffraction and scanning electron microscopy-energy-dispersive X-ray spectroscopy. The PP hollow ball substrate was sufficiently covered with the Ni-P coating and Ti was confirmed to be contained in the Ni-P coating. The obtained specimen floated when placed in aqueous solutions and its photocatalytic activity was confirmed through degradation of methylene blue. In addition, the Ni-P plating was found to protect PP from degrading by photocatalytic activity of the TiO2.

DOI： 10.2965/jwet.18-039

東日本大震災復興現場の視察報告と考察査読有り

松田智, 伊藤秀章, 戸谷満, 市野良一

廃棄物資源循環学会誌 29 巻 ( 5 ) 頁： 400 - 409 2018年9月

記述言語：日本語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：一般社団法人廃棄物資源循環学会

2016 年 6 月に，廃棄物資源循環学会東海・北陸支部では，東日本大震災復興現場の視察を実施した。本報では，その内容の報告と，それに基づくいくつかの考察を述べる。この現地視察の主な目的は，① 東日本大震災で大規模な被害を被った岩手県大槌町・山田町・宮古市の復興現場を視察するとともに，現地で復興事業に携わっている行政・企業体の担当者から貴重な体験談と今後の課題について説明を受ける，② 大震災による被害が時間とともに忘れ去られていく中で，現在進行中の復興事業が直面しているインフラ整備 (巨大防波堤建設や高台移転等のハード面) と住民によるコミュニティ形成等 (ソフト面) の，両面からの課題を考える，の 2 点であった。さらに，現地の実情に身をさらし肌で感じることにより，この震災の歴史的意味を考え，今後の環境教育を考えるよすがとすることも目的とした。本報ではさらに，今後の震災対策として重要な，災害廃棄物の処理・処分に関して，現地での見聞を基に考慮すべき諸点について論じた。

DOI： 10.3985/mcwmr.29.400

くえん酸ニッケルめっき浴からのパルス電解法による膜組織および硬度への影響査読有り

Development of Metal-Carbon Black Composite Plating with Wood's Bath

Kamimoto Yuki, Ohkura Shintaro, Tanaka Hidekazu, Hara Hideki, Hagio Takeshi, Deevanhxay Phengxay, Ichino Ryoichi

NANOSCIENCE AND NANOTECHNOLOGY LETTERS 10 巻 ( 5-6 ) 頁： 805-808 2018年5月

Seed-Assisted Synthesis of Magnetic Faujasite-Type Zeolite and Its Adsorption Performance

Hagio Takeshi, Kunishi Hiroto, Yamaoka Keiichi, Kamimoto Yuki, Ichino Ryoichi

NANOSCIENCE AND NANOTECHNOLOGY LETTERS 10 巻 ( 5-6 ) 頁： 862-867 2018年5月

Synthesis of Magnetic Activated Carbon Based on a Magnetite/Butyl Glycidyl Ether-Diluted Bisphenol A/Diethylenetriamine Epoxy Resin System

Nijpanich Supinya, Morihashi Ryo, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

NANOSCIENCE AND NANOTECHNOLOGY LETTERS 10 巻 ( 5-6 ) 頁： 843-848 2018年5月

Synthesis of Magnetic Activated Carbon Based on a Magnetite/Butyl Glycidyl Ether-Diluted Bisphenol A/Diethylenetriamine Epoxy Resin System 査読有り

S. Nijpanich, R. Morihashi, T. Hagio, Y. Kamimoto, R. Ichino

Nanoscience and Nanotechnology Letters 10 巻 ( 5-6 ) 頁： 843-848 2018年5月

Seed-Assisted Synthesis of Magnetic Faujasite-Type Zeolite and Its Adsorption Performance 査読有り

T. Hagio, H. Kunishi, K. Yamaoka, Y. Kamimoto, R. Ichino

Nanoscience and Nanotechnology Letters 10 巻 ( 5-6 ) 頁： 862-867 2018年5月

三宅猛司, 高松輝, 市野良一

表面技術 68 巻 ( 7 ) 頁： 409 - 411 2017年7月

Recovery of rare-earth elements from neodymium magnets using molten salt electrolysis 査読有り

Y. Kamimoto, T. Itoh, K. Kuroda, R. Ichino

Journal of Material Cycles and Waste Management 19 巻 ( 3 ) 頁： 1017-1021 2017年7月

Phosphorus removal and magnetic separation using magnetic schwertmannite 査読有り

Yuki Kamimoto, Kazushige Yamauchi, Takeshi Hagio, Ryoichi Ichino, Kyung Sok Min, Koo Ho Kwon, Ye Jin Kim, Yong Jun Jung

Desalination and Water Treatment 63 巻頁： 463-468 2017年

Removal properties of phosphate with Ettringite, 査読有り

Yuki Kamimoto, Keita Onda, Ryoichi Ichino, Kyung-Sok Min, Koo-Ho Kwon, Yong-Jun Jung

Desalination and Water Treatment 63 巻頁： 478-482 2017年

磁性化Mg-Fe系層状複水酸化物による有害陰イオンの除去

上寺啓太, 神本祐樹, 萩尾健史, 市野良一

廃棄物資源循環学会研究発表会講演集 28 巻 ( 0 ) 頁： 213 2017年

記述言語：日本語出版者・発行元：一般社団法人廃棄物資源循環学会

リンは富栄養化の原因物質であるとともに、資源としての枯渇が危惧されるため、除去ならびに回収が必要である。層状複水酸化物(以下LDH)は安価で容易に合成可能なアニオン吸着材であり、リン吸着材として期待される。しかしながら、LDHは粉末状で用いられるため、ろ過や沈殿分離による回収は困難である。そこでLDH合成時に強磁性体であるマグネタイトを添加することにより磁性LDHを合成した。磁性LDHはマグネタイトを43.1～57.8mass%含有していた。リンの吸着実験は、層間の炭酸イオンを焼成により除去したLDHを用いて行った。焼成によりマグネタイトの一部がヘマタイトに変態することが分かった。磁性LDHのリン吸着特性を評価したところ、pH4.0ではLDHと同程度の吸着量を示した。また、磁性LDHはLDHと比較し、ネオジム磁石を用いることで高速に回収できることが分かった。

DOI： 10.14912/jsmcwm.28.0_213