文献类型：期刊文献

英文题名：Core-Shell Structural CdS@SnO2 Nanorods with Excellent Visible-Light Photocatalytic Activity for the Selective Oxidation of Benzyl Alcohol to Benzaldehyde

作者：Liu, Ya;Zhang, Ping;Tian, Baozhu[1];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：2015

卷号：7

期号：25

起止页码：13849

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20152701000258);WOS:【SCI-EXPANDED(收录号:WOS:000357436800015)】；

基金：This work has been supported by the National Natural Science Foundation of China (21277046, 21173077, 21377038, 21237003), the Shanghai Committee of Science and Technology (13NM1401000), the National Basic Research Program of China (973 Program, 2013CB632403), the Research Fund for the Doctoral Program of Higher Education (20120074130001), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：CdS@SnO2; selective oxidation; benzyl alcohol; benzaldehyde; photocatalytic activity

摘要：Core-shell structural CdS@SnO2 nanorods (NRs) were fabricated by synthesizing SnO2 nanoparticles with a solvent-assisted interfacial reaction and further anchoring them on the surface of CdS NRs under ultrasonic stirring. The morphology, composition, and microstructures of the obtained samples were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption. It was found that SnO2 nanoparticles can be tightly anchored on the surface of CdS NRs, and the thickness of SnO2 shells can be conveniently adjusted by simply changing the addition amount of SnO2 quantum dots. UV-vis diffuse reflectance spectrum indicated that SnO2 shell layer also can enhance the visible light absorption of CdS NRs to a certain extent. The results of transient photocurrents and photoluminescence spectra revealed that the core-shell structure can effectively promote the separation rate of electron-hole pairs and prolong the lifetime of electrons. Compared with the single CdS NRs, the core-shell structural CdS@SnO2 exhibited a remarkably enhanced photocatalytic activity for selective oxidation of benzyl alcohol (BA) to benzaldehyde (BAD) under visible light irradiation, attributed to the more efficient separation of electrons and holes, improved surface area, and enhanced visible light absorption of core-shell structure. The radical scavenging experiments proved that in acetonitrile solution, O-center dot(2)- and holes are the main reactive species responsible for BA to BAD transformation, and the lack of (OH)-O-center dot radicals is favorable to obtaining high reaction selectivity.