文献类型：期刊文献

英文题名：Oxygen vacancies induced visible-light photocatalytic activities of CaCu3Ti4O12 with controllable morphologies for antibiotic degradation

作者：Hailili, Reshalaiti[1,2];Wang, Zhi-Qiang[3,4];Li, Yingxuan[1];Wang, Yuanhao[1];Sharma, Virender K.[5];Gong, Xue-Qing[3,4];Wang, Chuanyi[1]

机构：[1]Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China;[2]Chinese Acad Sci, Grad Sch, 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]Texas A&M Univ, Sch Publ Hlth, Dept Environm & Occupat Hlth, Program Environm & Sustainabil, College Stn, TX 77843 USA

年份：2018

卷号：221

起止页码：422

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20173904201504);WOS:【SCI-EXPANDED(收录号:WOS:000414109700043)】；

基金：The authors are grateful to the financial support of the National Nature Science Foundation of China (Grant Nos. 21473248, 21421004) and the CAS/SAFEA International Partnership Program for Creative Research Teams. Z. -Q. W and X. -Q. G also thank the National Super Computing Center in Jinan for computing time.

语种：英文

外文关键词：Visible light photocatalyst; Perovskite; Molten salt synthesis; Antibiotic decomposition

摘要：Searching photocatalysts with sufficient utilization of sunlight and elucidating relevant reaction mechanism are still grand challenges in the field of semiconductor photocatalysis. Herein, we developed a strategy towards morphology tailoring in conjunction with oxygen vacancy in the structure of double perovskite CaCu3Ti4O12. Cube, polyhedron, nanorod and octahedron shaped CaCu3Ti4O12 morphologies were obtained by varying the salt composition during molten salt synthesis, and their visible-light photocatalytic capacities were tested for degrading an antibiotic, tetracycline. The degradation process follows a first-order kinetics, and excellent photo-oxidation performance was observed for octahedron and nanorod shaped CaCu3Ti4O12 giving degradation rate constants of 1.14 x 10(-1) min(-1) and 8.40 x 10(-2) min(-1), respectively, much higher than those of polyhedron and cube shapes (their rate constants were 5.10 x 10(-2) min(-1) and 2.80 x 10(-2) min(-1), respectively). The improved photoefficiency could be attributed to high abundant oxygen vacancies, surface properties, charge transfer and enhanced carrier separation due to the synergetic roles of active species, as is supported by active species trapping experiments and theoretical simulations. The detailed mechanism was proposed on the basis of crystal structure, unique morphology and spin trapping experiment, which reveals the roles of various active species for efficiency enhancement. The enhanced efficiency was further elucidated by theoretical investigations of density functional theory (DFT) calculations on the adsorption between tetracycline and CaCu3Ti4O12. The findings reported here not only provide a green and rational design of high-performance photocatalysts but also show the applications ranged from catalysis to mitigation of polluted environment.