文献类型：期刊文献

英文题名：Photocatalytic reactivity of Ce-intercalated layered titanate prepared with a hybrid method based on ion-exchange and thermal treatment

作者：Gu, Xiaona;Chen, Feng[1];Zhao, Bin;Zhang, Jinlong

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

年份：2011

卷号：50

期号：2

起止页码：107

外文期刊名：SUPERLATTICES AND MICROSTRUCTURES

收录：;EI(收录号：20112914158016);WOS:【SCI-EXPANDED(收录号:WOS:000293721600003)】；

基金：This work was financially supported by the National Nature Science Foundation of China (20777015) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Titanate; Photocatalysis; Cerium ion; Reactivity; Ion-exchange

摘要：Ce-intercalated layered titanate (CeTO) was synthesized through an ion-exchange process combined with thermal treatment. According to X-ray diffraction (XRD) analysis, the interlayer shrinkage, lattice cell contraction and lattice dislocation of CeTO occur during the ion-exchange process. The ion-exchange process lengthens the bond length of Ti-O in the a-axis direction, which results in a bathochromic shift of titanate in UV-vis spectrum. Calcination treatment intensifies the interlayer shrinkage and reduces the lattice dislocation via lattice rearrangement. The photocatalytic reactivity of CeTO is significantly improved with thermal treatment at 400 degrees C. EPR study shows that most of the intercalated cerium ions are oxidized to Ce4+ after intercalation, while thermal treatment changes little the chemical valence of cerium ion. It is suggested that lattice dislocation but not chemical valence of cerium ion plays an important role in determining the photocatalytic activity of CeTO. Further, the photocatalytic reactivity of CeTO is much higher than cerium doped sodium titanate prepared by solid-state reaction (SSR) method. (C) 2011 Elsevier Ltd. All rights reserved.