title: A novel modified graphene oxide/chitosan composite used as an adsorbent for Cr(VI) in aqueous solutions.
abstract: A novel adsorbent for removal of hexavalent chromium (Cr(VI)) from aqueous solutions has been successfully prepared by modifying graphene oxide/chitosan composite with disodium ethylenediaminetetraacetate (EDTA-2Na) (GEC). This modified composite was characterized by various technologies; including scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Batch adsorption experiments were carried out to evaluate the adsorption of Cr(VI) by GEC under different conditions. The results indicate that the adsorption of Cr(VI) on GEC was highly pH-dependent, with the highest adsorption capacity (86.17mg/g) occurring at pH 2. The kinetics of adsorption exhibited pseudo-second-order behavior. The adsorption data were well described by the Freundlich isotherm model. The adsorption capacity increased with increasing temperature. The calculated thermodynamic parameters indicate that the adsorption is a spontaneous, endothermic and feasible process. The further regeneration experiments showed the adsorption capacity of GEC for Cr(VI) decreased 5% after 7 times reuse, indicating the potential of the as-prepared material for practical application.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster of Ministry of Education, Guangzhou 510006, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster of Ministry of Education, Guangzhou 510006, PR China. Electronic address: luohj@scut.edu.cn.
authors.forename: Hanjin
authors.initials: H
authors.lastname: Luo
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster of Ministry of Education, Guangzhou 510006, PR China.
authors.forename: Peipei
authors.initials: P
authors.lastname: Liu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster of Ministry of Education, Guangzhou 510006, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster of Ministry of Education, Guangzhou 510006, PR China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Geng
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010087:Oxides / Q000737:chemistry*; D012996:Solutions; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D010087:Oxides; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D002857:Chromium; C074702:chromium hexavalent ion; D006108:Graphite; D048271:Chitosan
keywords: Adsorption; Chitosan; Cr(VI); Graphene oxide; Modification