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Synthetic trends for BiVO4 photocatalysts: Molybdenum substitution vs. TiO2 and SnO2 heterojunctions


Kontic, R; Patzke, Greta R (2012). Synthetic trends for BiVO4 photocatalysts: Molybdenum substitution vs. TiO2 and SnO2 heterojunctions. Journal of Solid State Chemistry, 189:38-48.

Abstract

The influence of hydrothermal synthesis, thermal post-treatment at 500 °C and Mo content on a series of Bi1-x/3V1-xMoxO4 (0.02 < x < 0.15) photocatalysts was investigated for methylene blue (MB) degradation and O2 evolution. As Mo incorporation stabilizes the formation of tetragonal BiVO4 phases, only calcined Bi0.99V0.98Mo0.02O4 compounds showed good photocatalytic performance in MB decomposition. The Mo-induced blue shift of the band gap thus outweighs the positive influence of Mo-induced morphology stabilization and surface reactivity enhancement in Bi1-x/3V1-xMoxO4 materials. Both BiVO4@TiO2 and BiVO4:Mo@TiO2 heterojunction composites with TiO2 particle coatings in the 10 nm range were newly synthesized and displayed improved photocatalytic performance in MB degradation. Comparative studies with SnO2 heterojunctions revealed a superior influence of TiO2 deposition over SnO2 coating on both BiVO4 and Bi1-x/3V1-xMoxO4 oxide substrates. Different synthetic guidelines for BiVO4-based solid solutions and heterojunctions in photocatalytic wastewater treatment and water oxidation are discussed.

Abstract

The influence of hydrothermal synthesis, thermal post-treatment at 500 °C and Mo content on a series of Bi1-x/3V1-xMoxO4 (0.02 < x < 0.15) photocatalysts was investigated for methylene blue (MB) degradation and O2 evolution. As Mo incorporation stabilizes the formation of tetragonal BiVO4 phases, only calcined Bi0.99V0.98Mo0.02O4 compounds showed good photocatalytic performance in MB decomposition. The Mo-induced blue shift of the band gap thus outweighs the positive influence of Mo-induced morphology stabilization and surface reactivity enhancement in Bi1-x/3V1-xMoxO4 materials. Both BiVO4@TiO2 and BiVO4:Mo@TiO2 heterojunction composites with TiO2 particle coatings in the 10 nm range were newly synthesized and displayed improved photocatalytic performance in MB degradation. Comparative studies with SnO2 heterojunctions revealed a superior influence of TiO2 deposition over SnO2 coating on both BiVO4 and Bi1-x/3V1-xMoxO4 oxide substrates. Different synthetic guidelines for BiVO4-based solid solutions and heterojunctions in photocatalytic wastewater treatment and water oxidation are discussed.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Ceramics and Composites
Physical Sciences > Condensed Matter Physics
Physical Sciences > Physical and Theoretical Chemistry
Physical Sciences > Inorganic Chemistry
Physical Sciences > Materials Chemistry
Language:English
Date:2012
Deposited On:12 Mar 2012 17:57
Last Modified:23 Jan 2022 21:32
Publisher:Elsevier
ISSN:0022-4596
OA Status:Green
Publisher DOI:https://doi.org/10.1016/j.jssc.2011.11.050

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