Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 457, Issue -, Pages 100-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2014.05.062
Keywords
Adsorption; Graphene oxide; Chromium; Kinetics; Thermodynamics; FTIR
Categories
Funding
- National Natural Science Foundation of China [21277159]
- National Basic Research Program of China [2011CB936001]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB14020202]
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The adsorption kinetics, isotherms and thermodynamics of Cr(III) on graphene oxide (GO) were studied. The adsorption kinetic data were well described with pseudo-second-order model and the equilibrium data were well fitted by Langmuir model. The calculated thermodynamic parameters indicated that the adsorption of Cr(III) on GO was spontaneous and endothermic. The maximum adsorption capacity of Cr(III) on GO at pH 5.0 and T=296 K was about 92.65 mg g(-1), which was higher than other reported adsorbents. It was found that the adsorption of Cr(III) on GO was strongly dependent on solution pH, but weakly dependent on ionic strength. Fourier transform infrared (FTIR) spectra suggested that Cr(III) was adsorbed on GO mainly through the formation of inner-sphere complexes with the O-containing functional groups on GO surface. Results in this study suggested that GO was a suitable material for the preconcentration and removal of Cr(III) from water. (C) 2014 Elsevier B.V. All rights reserved.
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