Photooxidation reactions of polycyclic aromatic hydrocarbons over pure and Ag-loaded BiVO4 photocatalysts

被引：218

作者：

Kohtani, S ^{[1
]}

Tomohiro, M ^{[1
]}

Tokumura, K ^{[1
]}

Nakagaki, R ^{[1
]}

机构：

[1] Kanazawa Univ, Fac Pharmaceut Sci, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2005年 / 58卷 / 3-4期

关键词：

BiVO4; Ag-loaded BiVO4; silver loading; photooxidation; polycyclic aromatic hydrocarbons; visible light; OH radicals; reaction mechanism;

D O I：

10.1016/j.apcatb.2004.12.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：265 / 272

页数：8

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