文献类型：期刊文献

英文题名：Efficient removal of arsenate by versatile magnetic graphene oxide composites

作者：Sheng, Guodong[1,2];Li, Yimin[1];Yang, Xin[2];Ren, Xuemei[2];Yang, Shitong[2];Hu, Jun[2];Wang, Xiangke[2]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Key Lab Novel Thin Film Solar Cells, Inst Plasma Phys, Hefei 230031, Peoples R China

年份：2012

卷号：2

期号：32

起止页码：12400

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000312148500054)、、EI(收录号：20125115818343)、Scopus(收录号：2-s2.0-84871043775)、WOS

基金：Financial supports from 973 projects (2011CB933700), NSFC (21207092, 21071107, 20971126, 21107115), Doctoral Fund of Ministry of Education of China (20110111110002) and Natural Science Foundation of Anhui Province (Grant No: 1208085QB32) are acknowledged.

语种：英文

外文关键词：Graphene - Iron oxides - Magnetic separation - Magnetite - Nanomagnetics - Positive ions - Potable water - Water treatment

外文摘要：The magnetic graphene oxide (MGO) composites were prepared by coprecipitation of FeCl3 center dot 6H(2)O and FeCl2 center dot 4H(2)O on graphene oxide (GO) nanosheets and characterized in detail. The Fe3O4 was uniformly deposited on the surface of GO. The synthesized MGO composites were used as a versatile adsorbent for As(V) removal from aqueous solutions. The results showed that the adsorption of As(V) on MGO is an endothermic process and the adsorption kinetic fitted the pseudo-second-order model well. The MGO composites had a good adsorption capability for As(V) removal and the adsorption isotherms were described by the Langmuir model better than by the Freundlich model. The adsorption of As(V) on MGO decreased with ascending pH due to the electrostatic interaction. In addition, the adsorption of As(V) on MGO was greatly affected by the nature and concentration of coexisting cations and anions. The presence of coexisting anions showed an inhibiting effect on As(V) adsorption, which was more efficient at low pH, whereas the presence of coexisting cations showed an enhancing effect on As(V) adsorption, which was more efficient at high pH. The results of this work indicated that the combination of the excellent adsorption capacity of GO and the magnetic properties of Fe3O4 nanoparticles is very important in drinking water treatment due to the easy magnetic separation of MGO from aqueous solutions.