Preparation of magnetic Fe3O4@Cu/Ce microspheres for efficient catalytic oxidation co-adsorption of arsenic(Ⅲ)  

磁性Fe3O4@Cu/Ce微球催化氧化协同吸附重金属三价砷

作　　者：JIN Lin-feng CHAI Li-yuan SONG Ting-ting YANG Wei-chun WANG Hai-ying 金林锋;柴立元;宋婷婷;杨卫春;王海鹰(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,Changsha 410083,China;Beijing Urban Construction Design and Development Group Co.,Ltd.,Beijing 100037,China)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,Changsha 410083,China [3]Beijing Urban Construction Design and Development Group Co.,Ltd.,Beijing 100037,China

出　　处：《Journal of Central South University》2020年第4期1176-1185,共10页中南大学学报（英文版）

基　　金：Project(2018YFC1802204)supported by the National Key R&D Program of China;Project(51634010)supported by the Key Project of National Natural Science Foundation of China;Project(2018SK2026)supported by the Key R&D Program of Hunan Province,China。

摘　　要：Magnetic Fe3 O4@Cu/Ce microspheres were successfully prepared by one-step solvothermal approach and further utilized to remediate toxic arsenic(As(Ⅲ)) pollution. The effects of Cu/Ce elements co-doping on the crystal structure, catalytic oxidation and adsorption behaviors of magnetic microspheres were researched systematically. The results showed that with the aid of Cu/Ce elements, the grain size reduced, lattice defects increased, and the oxygen vacancies and surface hydroxyl groups were improved. Therefore, Cu/Ce elements endowed magnetic Fe3 O4@Cu/Ce microspheres with excellent As(III) removal performance, whose maximum adsorption capacity reached 139.19 mg/g. The adsorption mechanism mainly involved catalytic oxidant co-adsorption. This research developed a feasible strategy for the preparation of high efficiency magnetic adsorbent to enhance the removal of As(Ⅲ).本文通过一步溶剂法成功制备了磁性Fe3O4@Cu/Ce微球,并将其应用于毒性重金属三价砷的处理。系统考察了Cu/Ce元素共掺杂对复合材料结构晶型、催化氧化性能以及对三价砷的去除性能的影响。揭示了Cu/Ce元素的共掺杂效应可以显著降低磁性微球的晶粒尺寸,增加晶格缺陷,提高氧空缺位和丰富活性官能团。研究表明磁性Fe3O4@Cu/Ce微球对重金属三价砷具有较强的去除性能,最大吸附量可达139.19 mg/g。三价砷的去除机理主要涉及到催化氧化协同吸附,将三价砷氧化为五价砷的同时将其吸附在微球上。本文提出了一种可行的高性能磁性复合材料的制备方法,为三价砷的处理提供了技术思路。

关 键 词：Cu/Ce magnetic composites AS(III) catalytic oxidation adsorption 

分 类 号：X505[环境科学与工程—环境工程] TB332[一般工业技术—材料科学与工程] O647.3[理学—物理化学]