Characterization and Photocatalytic Properties of Porous BiVO4-SiO2 Composites
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.
Jinglong Bu, Zhengyi Jiang and Sihai Jiao
Y. D. Zhang et al., "Characterization and Photocatalytic Properties of Porous BiVO4-SiO2 Composites", Advanced Materials Research, Vols. 150-151, pp. 1267-1271, 2011