Faculty Profiles - ICHINO, Ryoichi

Papers - ICHINO, Ryoichi

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

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

Coatings Vol. 12 ( 9 ) 2022.9

Authorship：Last author Language：English Publisher：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

Scopus

Effect of Zn-Mg interlayer on the corrosion resistance of multilayer Zn-based coating fabricated by physical vapor deposition process Reviewed International coauthorship

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

Corrosion Science Vol. 202 2022.7

Language：English Publisher：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

Scopus

Electrodeposition of Amorphous Molybdenum Oxide on Iron-Group Element Based Plating and its Novel Application as a Corrosion Protective Coating Reviewed International coauthorship

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

Journal of the Electrochemical Society Vol. 169 ( 7 ) 2022.7

Language：English Publisher：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

Scopus

Simultaneous reduction and sequestration of hexavalent chromium by magnetic β-Cyclodextrin stabilized Fe<inf>3</inf>S<inf>4</inf> Reviewed International coauthorship International journal

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

Journal of Hazardous Materials Vol. 431 page： 128592 2022.6

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 Reviewed International coauthorship International journal

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

Environmental Technology and Innovation Vol. 26 2022.5

Impedance Characteristics of Monolayer and Bilayer Graphene Films with Biofilm Formation and Growth Reviewed International coauthorship

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 Vol. 22 ( 9 ) 2022.5

Language：English Publishing type：Research paper (scientific journal) Publisher：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

Scopus

PubMed

Photocatalytic Amino-Group Modification of Diamond and High Dispersion Composite Technique with Copper Substrate Reviewed

KATO Kazuki, ISHIDA Naoya, SUZUKI Norihiro, FUJIMOTO Kenjiro, HAGIO Takeshi, ICHINO Ryoichi, KONDO Takeshi, YUASA Makoto, UETSUKA Hiroshi, FUJISHIMA Akira, TERASHIMA Chiaki

Journal of The Surface Finishing Society of Japan Vol. 72 ( 12 ) page： 701 - 703 2021.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Surface Finishing Society of Japan

We strove to produce a microdiamond（MD）- copper composite by electroplating. Unfortunately, copper is naturally non-wetting with MD because of their chemical incompatibility. We achieved modification of the amino group for the MD surface using a photocatalytic treatment, followed by electroplating of the copper. Results demonstrated that the MD - copper composite material assisted by photocatalysis markedly improved their interfacial affinity and thermal conductivity.

DOI： 10.4139/sfj.72.701

CiNii Research

Preparation of amino group functionalized diamond using photocatalyst and thermal conductivity of diamond/copper composite by electroplating Reviewed International journal

Diamond and Related Materials Vol. 118 2021.10

Evenly distribution of amorphous iron sulfides on reconstructed Mg-Al hydrotalcites for improving Cr(VI) removal efficiency Reviewed International coauthorship International journal

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

Chemical Engineering Journal Vol. 417 2021.8

Electroplating of copper/microdiamond composites and the effect of diamond surface functionalization Reviewed International journal

Functional Materials Letters Vol. 14 ( 5 ) 2021.7

Effect of SiC formation temperature on improvement in thermal conductivity of electrodeposited SiC-coated diamond/Cu composite plating Reviewed International journal

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

Composite Interfaces Vol. 29 ( 3 ) 2021.6

The effect of bath pH on electrodeposition and corrosion properties of ternary Fe-W-Zn alloy platings Reviewed International journal

Journal of Solid State Electrochemistry Vol. 25 ( 6 ) page： 1901 - 1913 2021.6

Band Gap Engineering toward Wavelength Tunable CsPbBr<inf>3</inf>Nanocrystals for Achieving Rec. 2020 Displays Reviewed International coauthorship International journal

Chemistry of Materials Vol. 33 ( 10 ) page： 3575 - 3584 2021.5

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 Vol. 10 ( 11 ) page： 1 - 14 2020.11

Language：Japanese Publisher：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

Scopus

Floating Adsorbent for Organic Removal Fabricated Through Crystallization of Silicalite-1 on Hollow Glass Microspheres Reviewed International journal

Nijpanich Supinya, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

SCIENCE OF ADVANCED MATERIALS Vol. 12 ( 2 ) page： 173 - 179 2020.2

Investigation on Strontium Adsorption Selectivity of Hydrothermally Synthesized Layered Sodium Titanates Reviewed International journal

Kunishi Hiroto, Hagio Takeshi, Kamimoto Yuki, Ichino Ryoichi

SCIENCE OF ADVANCED MATERIALS Vol. 12 ( 2 ) page： 186 - 190 2020.2

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 Reviewed International journal

TANAKA Nana, KITAGAWA Shinya, OHTANI Hajime, IWAMA Yuki, KONDO Koichiro, ISHIGAKI Yuzo, SHIBATA Nobuyuki, KINOSHITA Takehiko, KAMIMOTO Yuki, ICHINO Ryoichi

CHROMATOGRAPHY Vol. 40 ( 2 ) page： 59 - 63 2019.6

Language：English Publishing type：Research paper (scientific journal) Publisher：The Society for Chromatographic Sciences

Continuous counter-current foam separation (CCFS) is a method for the recovery of valuable metals with high selectivity. It was developed as an organic solvent-free method, and the interaction of surfactants and metal ions in aqueous solution is a key precondition for the successful recovery. In this study, the interactions between the anionic complex of palladium(II) chloride and N,N’-dimethyl-N,N’-di-n-hexyl-thiodiglycolamide (MHTDA), which is an extraction agent for palladium(II), were investigated by capillary electrophoresis, in the presence of surfactants (sodium dodecyl sulfate (SDS) or polyoxyethylene mono-4-octylphenyl ether (POOPE)). The addition of MHTDA to an electrophoretic media containing SDS, resulted in electropherograms composed of two or three peaks. On the other hand, in the case of an electrophoretic media containing POOPE, the elimination of palladium (II) peak was observed due to MHTDA addition. This behavior suggested that the palladium-MHTDA neutral complex is rapidly captured in the POOPE micelles compared with the SDS micelles, and the use of POOPE is effective for the successful recovery of palladium(II) in CCFS.

DOI： 10.15583/jpchrom.2019.007

Web of Science

CiNii Research

Preparation of a Floating Photocatalyst via Electroless Ni-P-TiO2 Composite Plating on Polypropylene Balls for Wastewater Treatment Reviewed International coauthorship International journal

Nijpanich Supinya, Kamimoto Yuki, Hagio Takeshi, Ichino Ryoichi

Journal of Water and Environment Technology Vol. 17 ( 3 ) page： 131 - 140 2019

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment

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

Scopus

CiNii Research

Observation Report and Discussion on the Recovery and Reconstruction following the Great East Japan Earthquake Disaster Reviewed

Matsuda Satoshi, Itoh Hideaki, Toya Mitsuru, Ichino Ryoichi

Material Cycles and Waste Management Research Vol. 29 ( 5 ) page： 400 - 409 2018.9

Language：Japanese Publishing type：Research paper (other academic) Publisher：Japan Society of Material Cycles and Waste Management

In June 2016, the Tokai-Hokuriku branch of Japan Society of Material Cycles and Waste Management in Iwate Prefecture conducted an on-site inspection tour of three cities that were heavily damaged during the Great East Japan Earthquake of 2011. Although the scenarios and degrees of damage were different in these three cities of Ootsuchi, Yamada and Miyako, a vast amount of valuable information was obtained from the on-site inspection. This article presents a report of what was observed and the on-the-ground reality, while also providing a discussion regarding the various issues associated with the recovery and reconstruction process following the Great East Japan Earthquake disaster. The findings obtained here will be very helpful in preparing for any future earthquake disasters.

DOI： 10.3985/mcwmr.29.400

CiNii Research

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 Vol. 10 ( 5-6 ) page： 805-808 2018.5

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Papers - ICHINO, Ryoichi