Issue 6, 2015

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.

Graphical abstract: Enhanced removal performance of arsenate and arsenite by magnetic graphene oxide with high iron oxide loading

Supplementary files

Article information

Article type
Paper
Submitted
22 Oct 2014
Accepted
23 Dec 2014
First published
24 Dec 2014

Phys. Chem. Chem. Phys., 2015,17, 4388-4397

Author version available

Enhanced removal performance of arsenate and arsenite by magnetic graphene oxide with high iron oxide loading

F. Yu, S. Sun, J. Ma and S. Han, Phys. Chem. Chem. Phys., 2015, 17, 4388 DOI: 10.1039/C4CP04835K

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