title: Fabrication of magnetic porous Fe-Mn binary oxide nanowires with superior capability for removal of As(III) from water.
abstract: Magnetic porous Fe-Mn binary oxide nanowires were successfully fabricated to efficient removal of As(III) from water. The adsorption capacity of the porous nanowires for As(III) obviously increased with increasing of manganese oxide in the composite, accompanying decrease of the saturation magnetization of the adsorbents. Magnetic porous Fe-Mn binary oxide nanowires with an initial Fe:Mn molar ratio of 1:3 exhibited the highest absorption capacity for As(III) and enable magnetic separation from water. The maximal adsorption capacity value is 171mgg(-1) at pH 7.0. In the initial pH range from 3 to 9, 200μgL(-1) of As(III) could be easily decreased to below 10μgL(-1) by the magnetic porous Fe-Mn binary oxide nanowires (0.05gL(-1)) within 75min, and the corresponding residual As was completely oxidized to less toxic As(V). The coexisting chloride, nitrate and sulfate had no significant effect on arsenic removal, whereas, phosphate and humic acid reduced the removal of As(III) by competing with arsenic species for adsorption sites. The resulting magnetic porous Fe-Mn binary oxide nanowires could be a promising adsorbent for As(III) removal from water.
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors.forename: Hao-Jie
authors.initials: HJ
authors.lastname: Cui
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China.
authors.forename: Jie-Kui
authors.initials: JK
authors.lastname: Cai
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Zhao
authors.affiliation: College of Civil Engineering, Huaqiao University, Xiamen, 361021, China.
authors.forename: Baoling
authors.initials: B
authors.lastname: Yuan
authors.affiliation: College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China.
authors.forename: Cui-Ling
authors.initials: CL
authors.lastname: Ai
authors.affiliation: Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: mlfu@iue.ac.cn.
authors.forename: Ming-Lai
authors.initials: ML
authors.lastname: Fu
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053770:Nanowires; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D011042:Poisons / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D006812:Humic Substances; D017895:Manganese Compounds; D010087:Oxides; D011042:Poisons; C000499:ferric oxide; C027424:manganese oxide; D001151:Arsenic
keywords: Adsorption; As(III); Fe–Mn binary oxides; Magnetic porous nanowires; Oxidation