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

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。