Heterogeneous activation of persulfate by CuMgAl layered double oxide for catalytic degradation of sulfameter

作     者：Hongmin Zhang Qingzhu Jia Fangyou Yan Qiang Wang Hongmin Zhang;Qingzhu Jia;Fangyou Yan;Qiang Wang

作者机构：School of Marine and Environmental ScienceTianjin Marine Environmental Protection and Restoration Technology Engineering CenterTianjin University of Science and TechnologyTianjin300457China School of Chemical Engineering and Material ScienceTianjin University of Science and TechnologyTianjin300457China 

出 版 物：《Green Energy & Environment》 (绿色能源与环境（英文版）)

年 卷 期：2022年第7卷第1期

页      面：105-115页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0713[理学-生态学] 

基　　金：financially supported by the National Natural Science Foundation of China[No:21676203] Tianjin Universities“Youth Innovation Talent Training Program” 

主　　题：CuMgAl-LDO Heterogeneous catalysis Activated persulfate Sulfameter Reaction mechanism 

摘      要：In this study,a series of CuMgAl layered double oxides(CuMgAl-LDOs)were obtained via calcination of CuMgAl layered double hydroxides(CuMgAl-LDHs)synthesised via a co-precipitation method.The results show that CuMgAl-LDO can be prepared using an optimal Cu:Mg:Al molar ratio of 3:3:2,NaOH:Na_(2)CO_(3)molar ratio of 2:1,and calcination temperature of 600°C.CuMgAl-LDO is a characteristic of mesoporous material with a lamellar structure and large specific surface area.The removal efficiency of sulfameter(SMD)based on CuMgAl-LDO/persulfate(PS)can reach98%over a wide range of initial SMD concentrations(5–20 mg L^(-1)).The best removal efficiency of99.49%was achieved within 120 min using 10 mg L^(-1)SMD,0.3 g L^(-1)CuMgAl-LDO,and 0.7 mmol L^(-1)PS.Kinetic analysis showed that the degradation of SMD was in accordance with a quasi-first-order kinetic model.The stability of the CuMgAl-LDO catalyst was verified by the high SMD removal efficiency(97%within 120 min)observed after five recycling tests and low copper ion leaching concentration(0.89 mg L^(-1)),which is below drinking water quality standard of 1.3 mg L^(-1)permittable in the U.S.Radical scavenging experiments suggest that SO_(4)^(-)is the primary active species participating in the CuMgAl-LDO/PS system.Moreover,our mechanistic investigations based on the radical scavenging tests and X-ray photoelectron spectroscopy(XPS)results indicate that Cu^((II))-Cu^((III))-Cu^((II))circulation is responsible for activating PS in the degradation of SMD and the degradation pathway for SMD was deduced.Accordingly,the results presented in this work demonstrate that CuMgAl-LDO may be an efficient and stable catalyst for the activation of PS during the degradation of organic pollutants.