文献类型：期刊文献

英文题名：Synthesis of core-shell structured CdS@CeO2 and CdS@TiO2 composites and comparison of their photocatalytic activities for the selective oxidation of benzyl alcohol to benzaldehyde

作者：Zhang, Ping;Liu, Ya;Tian, Baozhu[1];Luo, Yusheng;Zhang, Jinlong[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, 130 Mei Long Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Inst Fine Chem, 130 Mei Long Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：281

起止页码：181

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20164803067119);WOS:【SCI-EXPANDED(收录号:WOS:000390515800020)】；

基金：This work has been supported by the National Natural Science Foundation of China (21277046, 21573069, 21377038), the Shanghai Committee of Science and Technology (13NM1401000), and the National Basic Research Program of China (973 Program, 2013CB632403).

语种：英文

外文关键词：CdS@CeO2; Selective oxidation; Benzyl alcohol; Benzaldehyde; Photocatalysis

摘要：Core-shell structured CdS@CeO2 and CdS@TiO2 composites were fabricated, with the aim of systematically comparing the influence of shell layer composition on the photocatalytic activity of CdS. The obtained samples were characterized by the means of transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption, and UV-vis diffuse reflectance spectroscopy (DRS). It was found that the core-shell structured CdS@CeO2 and CdS@TiO2 have been successfully constructed and the absorption edge exhibits a slight blue-shift after coating CeO2 or TiO2 shell layer. The selective oxidation of benzyl alcohol indicates that the photocatalytic activities of the synthesized samples show an increasing tendency in the order of CeO2 < CdS < CdS@TiO2 < CdS@CeO2-90 < CdS@CeO2-180 (CdS@CeO2 samples treated at 90 degrees C and 180 degrees C were denoted as CdS@CeO2-90 and CdS@CeO2-180, respectively). It was revealed that the redox couple Ce4+/Ce3+ in CeO2 shell not only promotes the separation of electron-hole pairs but also favors the transfer of electrons from the inner layer of CeO2 shell to its outer layer. Hydrothermal treatment can increase the contents of Ce3+ and chemisorbed oxygen, by which the photocatalytic activity can be enhanced. The radical scavenging experiments proved that in acetonitrile solution O-center dot(2)- and hble are the main reactive species responsible for the transformation from benzyl alcohol to benzaldehyde. (C) 2016 Elsevier B.V. All rights reserved.