Photophysical properties and photocatalytic activities under visible light irradiation of silver vanadates

被引：299
作者：
Konta, R
Kato, H
Kobayashi, H
Kudo, A
机构：
[1] Sci Univ Tokyo, Fac Sci, Dept Appl Chem, Shinjyuku Ku, Tokyo 1628601, Japan
[2] Kurashiki Univ Sci & Arts, Dept Chem & Biosci, Okayama 7128505, Japan
[3] Japan Sci & Technol Corp, CREST, Kawaguchi, Saitama 3320012, Japan
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2003年 / 5卷 / 14期
关键词：
D O I：
10.1039/b300179b
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：
alpha-AgVO3, beta-AgVO3, Ag4V2O7 and Ag3VO4 prepared by precipitation and solid-state reactions showed intense absorption bands in the visible light region due to band gap transitions. Comparison of a diffuse reflectance spectrum of alpha-NaVO3 with that of alpha-AgVO3 with a diopside-type structure revealed that a band gap (2.5 eV) of alpha-AgVO3 was 0.6 eV smaller than that (3.1 eV) of alpha-NaVO3. The electronic band structure study using a plane-wave based density functional method indicated that the decrease in the band gap of alpha-AgVO3 was due to Ag 4d orbitals which formed a valence band at a more negative level than O 2p orbitals. Among alpha-AgVO3, beta-AgVO3, Ag4V2O7 and Ag3VO4, only Ag3VO4 showed a photocatalytic activity for O-2 evolution from an aqueous silver nitrate solution under visible light irradiation. Holes photogenerated in Ag3VO4 can migrate to the reaction sites on the surface more easily than those of other silver vanadates, because the content of silver forming a valence band is large. It resulted in that holes photogenerated in Ag3VO4 are able to oxidize H2O to form O-2.
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页码：3061 / 3065
页数：5
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