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Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts

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Title: Characterisation and properties of visible light-active bismuth oxide-titania composite photocatalysts
Authors: Ratova, M. Browse this author
Tosheva, L. Browse this author
Kelly, P. J. Browse this author
Ohtani, B. Browse this author →KAKEN DB
Keywords: Photocatalysis
Titanium dioxide
Bismuth oxide
Visible light
Magnetron sputtering
Issue Date: Dec-2019
Publisher: Elsevier
Journal Title: Sustainable materials and technologies
Volume: 22
Start Page: e00112
Publisher DOI: 10.1016/j.susmat.2019.e00112
Abstract: Bismuth oxide - titanium dioxide composite materials were produced by pulsed DC reactive magnetron sputtering onto two types of commercially available titanium dioxide nanoparticles. The use of an oscillating bowl enabled deposition of bismuth oxide uniformly onto loose powders, in contrast to solid substrates typically used for the conventional magnetron sputtering processes. Variation of the deposition time allowed the production of composite materials with different amounts of bismuth oxide. The composite materials, as well as uncoated titania powders, were extensively analysed by a range of analytical techniques, including SEM/EDX, XRD, BET, XPS, TEM and UV-visible diffuse reflectance spectroscopy. Photocatalytic properties of the materials were assessed under simulated visible light irradiation via degradation of acetone and methanol through measurements of carbon dioxide evolution. Additionally, the composite materials were characterised with a newly developed technique of reversed double-beam photoacoustic spectroscopy in order to obtain information on the distribution of electron traps. Bismuth oxide was found in crystalline beta-Bi2O3 form on both types of substrates without any additional heat treatment applied. Though the distribution of bismuth oxide on titanium dioxide was found to depend strongly on particle size and deposition time used, the composite materials exhibited significantly enhanced visible light photocatalytic activity compared to either of the commercial titania materials used as a substrate. (C) 2019 Elsevier B.V. All rights reserved.
Rights: © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Type: article (author version)
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)

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