Oxygen vacancies induced visible-light photocatalytic activities of CaCu3Ti4O12 with controllable morphologies for antibiotic degradation
Hailili, R (Hailili, Reshalaiti); Wang, ZQ (Wang, Zhi-Qiang); Li, YX (Li, Yingxuan); Wang, YH (Wang, Yuanhao); Sharma, VK (Sharma, Virender K.); Gong, XQ (Gong, Xue-Qing); Wang, CY (Wang, Chuanyi)
2018
发表期刊Applied Catalysis B: Environmental
卷号221期号:2页码:422-432
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.

关键词Visible Light Photocatalyst Perovskite Molten Salt Synthesis Antibiotic Decomposition
DOI10.1016/j.apcatb.2017.09.026
收录类别SCI
WOS记录号WOS:000414109700043
引用统计
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/5067
专题中国科学院特殊环境功能材料与器件重点试验室
作者单位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
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Hailili, R ,Wang, ZQ ,Li, YX ,et al. Oxygen vacancies induced visible-light photocatalytic activities of CaCu3Ti4O12 with controllable morphologies for antibiotic degradation[J]. Applied Catalysis B: Environmental,2018,221(2):422-432.
APA Hailili, R .,Wang, ZQ .,Li, YX .,Wang, YH .,Sharma, VK .,...&Wang, CY .(2018).Oxygen vacancies induced visible-light photocatalytic activities of CaCu3Ti4O12 with controllable morphologies for antibiotic degradation.Applied Catalysis B: Environmental,221(2),422-432.
MLA Hailili, R ,et al."Oxygen vacancies induced visible-light photocatalytic activities of CaCu3Ti4O12 with controllable morphologies for antibiotic degradation".Applied Catalysis B: Environmental 221.2(2018):422-432.
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