文献类型：期刊文献

英文题名：Layered nanostructured ferroelectric perovskite Bi5FeTi3O15 for visible light photodegradation of antibiotics

作者：Hailili, Reshalaiti[1,2];Wang, Zhi-Qiang[3,4];Xu, Meiyue[5];Wang, Yuanhao[1];Gong, Xue-Qing[3,4];Xu, Tao[5];Wang, Chuanyi[1]

机构：[1]Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Urumqi 830011, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Ctr Computat Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China;[5]Northern Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA

年份：2017

卷号：5

期号：40

起止页码：21275

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20174304288029);WOS:【SCI-EXPANDED(收录号:WOS:000413189100023)】；

基金：The authors are grateful to the financial support of the National Nature Science Foundation of China (Grant Nos 21473248 and 21421004), the CAS/SAFEA International Partnership Program for Creative Research Teams. T. Xu also acknowledges the financial support from the U.S. National Science Foundation (CBET-1150617).

语种：英文

外文关键词：Antibiotics - Organic carbon - Free radical reactions - Organic pollutants - Decay (organic) - Hydrothermal synthesis - Light - Perovskite - Water pollution - Ferroelectricity - Health risks - Light absorption - Water treatment - Bismuth compounds - Free radicals - Photodegradation - Photolysis - Solutions - Carrier lifetime - Irradiation - Density functional theory - Photoluminescence - Rate constants

摘要：Solar photocatalytic degradation of organic pollutants is a promising cheap way for waste water disinfection. There are two weaknesses in the photocatalytic process: inadequate utilization of light energy and fast charge recombination. Effective surface-interface control over morphological tailoring can provide a large surface area, and prevent quick recombination of carriers, resulting in efficiency enhancement. In this work, we focus on enhancing the critical elemental photocatalytic steps via innovation in material chemistry. A diverse series of nanostructured ferroelectric Bi5FeTi3O15 with enhanced charge separation originating from their ferroelectric nature were synthesized by varying the pH value during the hydrothermal synthesis. Their photocatalytic properties can also be tailored to best fit the degradation of hazardous antibiotics (e.g. tetracycline) in aqueous solution, including light absorption in the solar spectrum, charge separation, structure and surface charge for effective mass transport. The photodegradation of tetracycline follows first-order kinetics, and a significantly enhanced photooxidation performance is observed for 3D flower-like Bi5FeTi3O15 with a degradation rate constant of 1.97 x 10(-1) min(-1), much faster than that reported in the literature for Fe-based visible light active photocatalysts towards tetracycline degradation. Density functional theory calculations indicate that the higher electron densities in [Bi3FeTi3O13](2-) layers can favor the transport of photogenerated electrons and holes in alternate layers, promoting a longer charge carrier lifetime from 3.4 ns to 7.1 ns, as revealed by time-resolved photoluminescence spectra. The photodegradation mechanism is supported by theoretical calculation and experimentally identified by free radical and spin trapping experiments, LC-MS, and reduced total organic carbon analysis with approximately 94.88% removal, all of which testify to the complete mineralization of the antibiotics.