title: Efficient As(III) removal by magnetic CuO-Fe3O4nanoparticles through photo-oxidation and adsorption under light irradiation.
abstract: A novel bifunctional CuO-Fe3O4magnetic material was synthesized and characterized, to remove As(III) through photo-oxidation and adsorption. Photo-oxidation of As(III), adsorption characteristics of CuO-Fe3O4nanoparticles, the effect of solution pH, ionic strength and coexisting ions on As(III) removal were investigated. Under light irradiation, As(III) could be completely oxidized to less toxic As(V) by CuO-Fe3O4nanoparticles within 60min in the photo-oxidation reaction. Simultaneously, As(V) could be adsorbed onto the surface of nanoparticles with high efficiency. The adsorption of As(V) was well fitted by the pseudo-second-order model and the Freundlich isotherm model, respectively, and the maximum adsorption capacities of the nanoparticles was 118.11mg/g at pH 7.0. As(III) could be effectively removed by CuO-Fe3O4nanoparticles at initial pH range from 4 to 8. Among all the common coexisting ions investigated, except for chloride and sulfate, carbonate, silicate and phosphate decreased the As(III) removal by competing with arsenic species for adsorption sites. The synthesized magnetic CuO-Fe3O4combined the photocatalytic property of CuO and the high adsorption capacity of both CuO and Fe3O4, which make it have significant potential applications in the arsenic wastewater treatment.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Tianyi
authors.initials: T
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Department of National Defense Architecture Planning and Environmental Engineering, Logistical Engineering University, Chongqing 401311, China. Electronic address: hit_zzw@163.com.
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Liang
authors.affiliation: Department of National Defense Architecture Planning and Environmental Engineering, Logistical Engineering University, Chongqing 401311, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Wenxin
authors.initials: W
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Fuyi
authors.initials: F
authors.lastname: Cui
keywords: Adsorption; As(III); As(V); CuO-Fe(3)O(4) nanoparticles; Magnetic separation; Photo-oxidation