期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 103, 期 1, 页码 162-167出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2007.02.008
关键词
bismuth vanadate; selective synthesis; photocatalyst; visible-light
Tetragonal and monoclinic bismuth vanadate (BiVO4) powders were selectively synthesized by aqueous processes. The characterizations of the as-prepared BiVO4 powders were carried out by X-ray diffraction, nitrogen adsorption, scanning electron microscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic activities of different BiVO4 samples were determined by degradation of methylene blue solution under visible-light irradiation (lambda > 420 nm) and compared with that of TiO2 (Degussa P25). The band gaps of the as-prepared BiVO4 were determined from UV-vis diffuse reflectance spectra. It was found that monoclinic BiVO4 with a band gap of 2.34 eV showed higher photocatalytic activity than that of tetragonal BiVO4 with a band gap of 3.11 eV. (C) 2007 Elsevier B.V. All rights reserved.
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