Photoformed electron transfer from TiO₂ to metal clusters

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• 作者：Jacinto S&#xe1 ; Marcos Fern&#xe1 ; ndez-Garc&#xed ; a ; James A. Anderson
• 关键词：Photocatalysis ; Dye degradation ; Titania ; Metal clusters
• 刊名：Catalysis Communications
• 出版年：2008
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：10 June 2008
• 卷：9
• 期：10
• 页码：1991-1995
• 文件大小：522 K

摘要

Detection of mobile charge carriers consistent with a process involving electron transfer from TiO₂ to metal particle was measured by EPR and FTIR in the presence of a hole scavenger and under UV irradiation. The main role of the metal (Ag, Au or Cu) was to scavenge the photogenerated electrons leading to an improvement in charge separation with respect to unmodified TiO₂ alone. The improvement of charge separation yielded a greater number of holes that were available for surface reaction. A higher rate of reaction on the bleaching of Rhodamine 6G was measured when metal clusters were added to TiO₂. Monitoring of solution pH during the degradation of the dye suggest a range of products were formed, whose nature depended both on the presence of metal and on the particular metal present.