Characterization and Photocatalytic Properties of Porous BiVO₄-SiO₂ Composites

Abstract:

Visible-light-induced BiVO4-SiO2 composites photocatalysts with monoclinic scheelite structure were successfully synthesized via a sol-gel method, and were characterized with XRD, XPS, DRS, SEM and BET. The result indicated that BiVO4-SiO2 composite photocatalysts exhibited relatively high BET surface areas, consisting of primary nanocrystals with average size of 44 nm. The band gap of the sample was estimated to be 2.56 eV, representing an obvious blue-shift compared with that of the SSR-BiVO4 sample. The photocatalytic activities were also evaluated by decolorization of methylene blue (MB) under blue light. The photodegradation rate of BiVO4-SiO2 composite photocatalysts was quite high, up to 69% in 2 h, which was much better than that of the reference sample prepared by solid-state reaction (5.5%) under the same conditions.

• Periodical: Advanced Materials Research (Volumes 150-151)
• Pages: 1267-1271
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.150-151.1267
• Online since: October 2010
• Authors: Yu Dong Zhang, Xun Jia Su, Gen Liang Hou, Song Bi, Feng Guo, Zhen Xing Mei
• Keywords: BiVO₄-SiO₂ Composite, Photocatalytic, Photodegradation, Visible Light

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