Photophysical properties and photocatalytic activities under visible light irradiation of silver vanadates
作者： Ryoko Konta , Hideki Kato , Hisayoshi Kobayashi , Akihiko Kudo
DOI: 10.1039/B300179B
关键词:
摘要: α-AgVO3, β-AgVO3, Ag4V2O7 and Ag3VO4 prepared by precipitation solid-state reactions showed intense absorption bands in the visible light region due to band gap transitions. Comparison of a diffuse reflectance spectrum α-NaVO3 with that α-AgVO3 diopside-type structure revealed (2.5 eV) was 0.6 eV smaller than (3.1 α-NaVO3. The electronic study using plane-wave based density functional method indicated decrease Ag 4d orbitals which formed valence at more negative level O 2p orbitals. Among Ag3VO4, only photocatalytic activity for O2 evolution from an aqueous silver nitrate solution under irradiation. Holes photogenerated can migrate reaction sites on surface easily those other vanadates, because content forming is large. It resulted holes are able oxidize H2O form O2.
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