期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 58, 期 3-4, 页码 265-272出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2004.12.007
关键词
BiVO4; Ag-loaded BiVO4; silver loading; photooxidation; polycyclic aromatic hydrocarbons; visible light; OH radicals; reaction mechanism
Photooxidative degradations of nine polycyclic aromatic hydrocarbons (PAHs) using pure and Ag-loaded BiVO4 photocatalysts have been examined in acetonitrile under visible light irradiation. Photoproducts have been identified by means of gas chromatography-mass spectrometry (GC-MS). Silver fine particles loaded on BiVO4 surface improved the reaction rates of all PAHs degradations. In particular, anthracene and benz[a]anthracene (Bz[a]A) are efficiently oxidized to anthraquinone and benz[a]anthracene-7,12-dione, respectively. Photooxidation mechanism of anthracene and Bz[a]A has been clarified by the GC-MS analyses by the use of (H2O)-O-18 as a reactant. It has been proved that OH radicals are generated through the oxidation of water by valence band holes on the Ag-BiVO4 surface in acetonitrile, and greatly contribute to the degadations of these PAHs. The OH radical attack to PAHs probably determines the overall rates of oxidation of PAHs on Ag-BiVO4 photocatalyst. (c) 2004 Elsevier B.V. All rights reserved.
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