Synthesis of amino functionalized magnetic graphenes composite material and its application to remove Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II) from contaminated water

•Graphenes magnetic composite nanoparticles (Fe3O4-GS) were used to adsorb metal ions.•The adsorption of metal ions onto Fe3O4-GS could be well interpreted by the Freundlich equation.•The adsorption of metal ions onto Fe3O4-GS fit pseudo-second order kinetic model.•Thermodynamic studies illustrated...

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Bibliographic Details
Published in:Journal of hazardous materials 2014-08, Vol.278, p.211-220
Main Authors: Guo, Xiaoyao, Du, Bin, Wei, Qin, Yang, Jian, Hu, Lihua, Yan, Liangguo, Xu, Weiying
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherm
Adsorption kinetics
Applied sciences
Biological and physicochemical phenomena
Chelation
Chemical engineering
Composite materials
Endothermic reactions
Exact sciences and technology
Fe3O4-GS
Ferrosoferric Oxide - chemistry
Graphene
Graphite - chemistry
Heavy metal ions
Ion exchange
Ion exchangers
Magnetic fields
Metals, Heavy - chemistry
Natural water pollution
Pollution
Sorbents
Sorption
Thermodynamics
Waste Disposal, Fluid - methods
Water Pollutants, Chemical - chemistry
Water treatment and pollution
X-ray photoelectron spectroscopy
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Summary:•Graphenes magnetic composite nanoparticles (Fe3O4-GS) were used to adsorb metal ions.•The adsorption of metal ions onto Fe3O4-GS could be well interpreted by the Freundlich equation.•The adsorption of metal ions onto Fe3O4-GS fit pseudo-second order kinetic model.•Thermodynamic studies illustrated that the adsorption process was endothermic and spontaneous in nature. In the present study, a kind of graphenes magnetic material (Fe3O4-GS) was prepared by compositing graphene sheet with ferroferric oxide, and shown to be effictive for removing Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II) ions from aqueous solution. The synthesized sorbent was characterized by SEM, TEM, FTIR, XRD, XPS and BET, respectively. The pHZPC value of the sorbent was estimated to be 3.5 by alkaline-titration methods. Fe3O4-GS can be simply recovered from water with magnetic separation at low magnetic field within one minute. The sorption capacities of the metals were 17.29, 27.95, 23.03, 27.83 and 22.07mgg−1 for Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II), respectively. Kinetic data showed good correlation with pseudo-second-order equation and the Freundlich model was found to fit for the isotherm data of all the heavy metal ions. It was found that the metals sorption was accomplished mainly via chelation or ion exchange. The results of thermodynamic studies illustrate that the adsorption process was endothermic and spontaneous in nature.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2014.05.075