Visible Light Responsive Pristine Metal Oxide Photocatalyst: Enhancement of Activity by Crystallization under Hydrothermal Treatment

被引：220

作者：

Amano, Fumiaki ^{[1
,2
]}

Yamakata, Akira ^{[1
,2
]}

Nogami, Kohei ^{[2
]}

Osawa, Masatoshi ^{[1
,2
]}

Ohtani, Bunsho ^{[1
,2
]}

机构：

[1] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0010021, Japan

[2] Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido 0600810, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 52期

关键词：

D O I：

10.1021/ja807438z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Photocatalytic activities of amorphous and crystal bismuth tungstate (Bi2WO6)were investigated using oxidative decomposition of gaseous acetaldehyde under visible light irradiation (>400 nm). Here, for the first time, negligible photocatalytic activity of amorphous Bi2WO6 owing to the fast recombination of electron-hole pairs and the high quantum efficiency of Bi2WO6 crystallites under visible light were demonstrated by action spectrum analysis and time-resolved infrared absorption measurements. Crystallization of the amorphous phase provided a red shift of the photoabsorption edge and marked increase in the lifetime of photoexcited electrons, resulting in an increase of photocatalytic activity.

引用

页码：17650 / +

页数：3

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