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...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).展开更多
This study focuses on the effectiveness of hydrous manganese dioxides （ζMnO2） removing arsenite （As（Ⅲ）） from aqueous solution. Effects of such factors as permanganate oxidation, pH, humic acid and Ca^2＋ on As...This study focuses on the effectiveness of hydrous manganese dioxides （ζMnO2） removing arsenite （As（Ⅲ）） from aqueous solution. Effects of such factors as permanganate oxidation, pH, humic acid and Ca^2＋ on As removal and possible mechanisms involved in have been investigated. Permanganate oxidation increases As removal to a certain extent; the higher pH results in the formation of more easily adsorbed As species, contributing to higher As removal; hmnic acid occupies adsorbing sites and decreases ζ potential of ζMnO2, therefore inhibiting As removal; Ca^2＋ facilitates As adsorption on ζMnO2, mainly through increasing ζ potential and decreasing repulsive forces between As and surface sites.ζMnO2 exhibits oxidative and adsorptive potential for As（Ⅲ）, and may be employed as adsorbents or filter coating for As removal in water treatment process.展开更多
基金Project(2018YFC1802204)supported by the National Key R&D Program of ChinaProject(51634010)supported by the Key Project of National Natural Science Foundation of ChinaProject(2018SK2026)supported by the Key R&D Program of Hunan Province,China。
文摘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).
文摘This study focuses on the effectiveness of hydrous manganese dioxides （ζMnO2） removing arsenite （As（Ⅲ）） from aqueous solution. Effects of such factors as permanganate oxidation, pH, humic acid and Ca^2＋ on As removal and possible mechanisms involved in have been investigated. Permanganate oxidation increases As removal to a certain extent; the higher pH results in the formation of more easily adsorbed As species, contributing to higher As removal; hmnic acid occupies adsorbing sites and decreases ζ potential of ζMnO2, therefore inhibiting As removal; Ca^2＋ facilitates As adsorption on ζMnO2, mainly through increasing ζ potential and decreasing repulsive forces between As and surface sites.ζMnO2 exhibits oxidative and adsorptive potential for As（Ⅲ）, and may be employed as adsorbents or filter coating for As removal in water treatment process.
