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Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

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Title: Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants
Authors: Wei, Z. Browse this author
Endo, M. Browse this author
Wang, K. Browse this author
Charbit, E. Browse this author
Markowska-Szczupak, A. Browse this author
Ohtani, B. Browse this author →KAKEN DB
Kowalska, E. Browse this author →ORCID
Keywords: Antimicrobial activity
Modified titania
Octahedral anatase particles
Plasmonic nanoparticles
Photocatalytic activity
Visible light-responsive photocatalysts
Issue Date: 15-Jun-2017
Publisher: Elsevier
Journal Title: Chemical engineering journal
Volume: 318
Start Page: 121
End Page: 134
Publisher DOI: 10.1016/j.cej.2016.05.138
Abstract: Octahedral anatase particles (OAPs) were prepared by hydrothermal (HT) reaction of titanate nanowires (TNWs). OAPs were modified with noble metals (Au, Ag, Cu and Pt) by two photodeposition methods: in the absence and in the initial presence of oxygen in the system. Photocatalytic activities for oxidative decomposition of acetic acid and anaerobic dehydrogenation of methanol under UV/vis irradiation and for oxidation of 2-propanol under visible light irradiation were investigated. Antibacterial activities for bacteria (Escherichia coli) and fungi (Candida albicans) were investigated in the dark and under UV irradiation and/or visible light irradiation. It was found that the kind of metal deposition significantly influenced the properties of photocatalysts obtained and thus their photocatalytic and antimicrobial activities. Modification of OAPs with metallic deposits resulted in enhanced photocatalytic activities for all tested systems. Pt-modified OAPs showed the highest activity for dehydrogenation of methanol due to their highest work function and lowest activation overpotential of hydrogen evolution. Cu-modified OAPs exhibited the highest activity for oxidative decomposition of acetic acid under UV/vis irradiation, probably due to the heterojunction between Cu oxides and TiO2. On the other hand, Au-modified OAPs showed the highest photocatalytic activity under visible light irradiation due to their plasmonic properties. Bare OAPs, prepared with various durations of the HT reaction, did not have any antibacterial properties in the dark, while their activity under UV/vis irradiation was correlated with their photocatalytic activities for dehydrogenation of methanol and decomposition of acetic acid. Antimicrobial activity of modified OAPs in the dark and under visible light irradiation was the highest for Ag-modified OAPs. Under UV irradiation, Cu-modified OAPs showed the highest activity for inactivation of both bacteria and fungi. (C) 2016 The Authors. Published by Elsevier B.V.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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