文献类型：期刊文献

英文题名：The role of interfacial lattice Ag⁺ on titania based photocatalysis

作者：Yang, Hongyun;Chen, Feng[1];Jiao, Yanchao;Zhang, Jinlong

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：130

起止页码：218

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000314381700024)】；

基金：This work was supported by the National Nature Science Foundations of China (21177039) and the Innovation Program of Shanghai Municipal Education Commission (13ZZ042).

语种：英文

外文关键词：Ag-0; Ag+; TiO2; Photocatalysis; Interface

摘要：Ag-0/Ag+/TiO2 composites were prepared via alkalescent hydrothermal process in aqueous ammonia, and Ag+/TiO2 was prepared by eluting the Ag-0 cluster from the Ag-0/Ag+/TiO2 composites with K-3[Fe(CN)(6)]/aqueous ammonia. Methyl orange (MO) and Rhodamine B (RhB) were used to test the photocatalytic activity of the photocatalysts. The photocatalytic activity of the composites was greatly improved after eluting Ag-0 clusters from the Ag-0/Ag+/TiO2 composites. Interfacial lattice Ag+ cations but not Ag-0 clusters are responsible for improving the photocatalytic performance of the composites in this work. XPS measurement shows that the chemical state of the interfacial lattice Ag+ cation is different with the surface chemical adsorbed Ag+ cation. Surface chemical adsorbed Ag+ cation is invalid to promote the photocatalytic activity of TiO2 while Na+ cation can cancel the promotional effect of the interfacial lattice Ag+ cation by competitively occupying the interfacial lattice defects. The 2 h turn over numbers of the interfacial lattice Ag+ cations to the degradation of MO and RhB reach 8 and 10, respectively, which show that the interfacial lattice Ag+ cations act as recyclable catalytic sites but not one-time consumptive species. (c) 2012 Elsevier B.V. All rights reserved.