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

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• 作者：Fumiaki Amano ; Akira Yamakata ; Kohei Nogami ; Masatoshi Osawa ; Bunsho Ohtani
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：December 31, 2008
• 年：2008
• 卷：130
• 期：52
• 页码：17650-17651
• 全文大小：157K
• 年卷期：v.130,no.52(December 31, 2008)
• ISSN：1520-5126

文摘

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.