文献类型：期刊文献

英文题名：Sandwich-structured AgCl@Ag@TiO2 with excellent visible-light photocatalytic activity for organic pollutant degradation and E-coli K12 inactivation

作者：Tian, Baozhu[1,2];Dong, Rongfang[1,2];Zhang, Jingming[3];Bao, Shenyuan[1,2];Yang, Fan[1,2];Zhang, Jinlong[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Second Mil Med Univ, Sch Pharm, Dept Pharmacol, Shanghai 200433, Peoples R China

年份：2014

卷号：158

起止页码：76

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000339133500009)】；

基金：This work has been supported by the National Natural Science Foundation of China (21277046, 21047002, 21173077), the Shanghai Committee of Science and Technology (13NM1401000), the Shanghai Natural Science Foundation (10ZR1407400), the National Basic Research Program of China (973 Program, 2010CB732306), and the Project of International Cooperation of the Ministry of Science and Technology of China (2011DFA50530).

语种：英文

外文关键词：Sandwich-structure; Silver chloride; Photocatalytic degradation; Organic pollutants; E. coli K12

摘要：Sandwich-structured AgCl@Ag@TiO2 plasmonic photocatalyst was synthesized by a facile multistep route, including a controllable double-jet precipitation technique to fabricate cubic AgCl core, a gradual temperature-rise process to coat TiO2 shell layer, and UV light reduction to generate Ag nanoparticles (NPs) between AgCl core and TiO2 shell. The obtained samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS). Beneficial from the fact that Ag NPs can respond to visible light and sandwich-structure can effectively separate the photo-generated electrons and holes, AgCl@Ag@TiO2 exhibited excellent visible-light photocatalytic activity not only for the degradations of acid orange 7 and 2,4-dichlorophenol but also for the inactivation of Escherichia coli (E. coli) K12. The transient photocurrent tests proved that AgCl@Ag@TiO2 sandwich-structure has higher efficiency for the separation of photo-generated electrons and holes than AgCl@Ag core-shell structure. Electron spin resonance (ESR) tests with DMPO and the radical trapping experiments confirmed that center dot O-2-, center dot OH and Cl degrees are the reactive species responsible for the degradation of organic pollutants and bacteria. (C) 2014 Elsevier B.V. All rights reserved.