title: Enhanced removal performance of arsenate and arsenite by magnetic graphene oxide with high iron oxide loading.
abstract: Magnetic iron oxide/graphene oxide (MGO) with high iron loading (51 wt%) has been successfully synthesized using the co-precipitation method, and then used as adsorbents for the removal of arsenate and arsenite from aqueous solutions. The resulting MGO possesses desirable magnetic properties (12.8 emu g(-1)) and excellent adsorption properties for the removal of As(III) and As(IV) with significantly enhanced adsorption capacities of 54.18 mg g(-1) and 26.76 mg g(-1), respectively. These values are much higher than those of other GO-based composites reported previously. The kinetic, equilibrium and environmental effects (pH, ionic strength, coexist anion) of MGO were obtained experimentally. A synchrotron-based X-ray fluorescent microprobe was used to generate elemental distribution maps of adsorbents; the results suggest that As(v) became preferentially associated with iron oxides during the adsorption process, and that the distribution of Fe is directly correlated with the distribution of As.
authors.affiliation: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai 201418, China. hansheng654321@sina.com.
authors.forename: Fei
authors.initials: F
authors.lastname: Yu
authors.forename: Sainan
authors.initials: S
authors.lastname: Sun
authors.forename: Jie
authors.initials: J
authors.lastname: Ma
authors.forename: Sheng
authors.initials: S
authors.lastname: Han
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000302:isolation & purification*; D018053:Arsenites / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053758:Nanoparticles; D009994:Osmolar Concentration; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D001149:Arsenates; D018053:Arsenites; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; D014867:Water; C000499:ferric oxide; D006108:Graphite; C015001:arsenite; C025657:arsenic acid