Removal of As(III) and As(V) from Water Using Magnetic Core-Shell Nanomaterial Fe3O4@Polyaniline (Pages: 54-64)
Qingxiang Zhou1, Jingjie Wang1,2, Xiangkun Liao3, Junping Xiao2 and Huili Fan2
1College of Geosciences, China University of Petroleum Beijing, Beijing 102249, China; 2College of Chemistry and bioengineering, University of Science and Technology Beijing, Beijing 100083, China and 3Environmental Protection Agency of Guangshan County, Guangshan 465400, Henan Province, China
Abstract: Arsenic pollution is an important hot topic in environmental field, and it is of great value to develop new methods for removal of arsenic pollution. Present study reported a magnetic core-shell material,polyaniline coated Fe3O4 (Fe3O4@PANI) synthesized using a simple two-step polymerization method, which was characterized by transmission electron microscopy(TEM), scanning electron microscope(SEM), FT-IR, X-ray diffraction(XRD), and a vibrating sample magnetometer(VSM) to confirm microstructure and morphology of the hybrid materials. As(III) and As(V) were used as the model analytes and the various parameters such as pH, adsorbent dosage, contact time, coexisting ions and humic acid were investigated. Under optimal conditions,the adsorption of arsenic followedpseudo-second-order kinetics, andthe adsorption isotherms conformed to Freundlich adsorption isotherm model. The adsorption capacity (qmax) of Fe3O4@PANI forarsenite and arsenate in terms of monolayer adsorption were1.066 and 1.385mg/g, respectively. The adsorption was spontaneous and exothermic process. These results indicatedthat present study provided a rapid, easy to separate, and low cost method for the removal of As(III) and As(V), and would have great prospect in the removal and remediation of pollutants.
Keywords: Fe3O4@polyaniline, magnetic core-shell material, arsenite, arsenate.