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In relation to this article, we declare that there is no conflict of interest.
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Received November 19, 2013
Accepted February 5, 2014
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Few-layered graphene oxides as superior adsorbents for the removal of Pb(II) ions from aqueous solutions

Nanjing University of Aeronautics & Astronautics, 29 Yudao Street, Nanjing 210016, China 1New Star Institute of Applied Technology, No. 451 Huangshan Road, Hefei, Anhui 230031, China
jiawb422@163.com, jiawb@nuaa.edu.cn
Korean Journal of Chemical Engineering, July 2014, 31(7), 1265-1270(6), 10.1007/s11814-014-0045-z
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Abstract

Few-layered graphene oxides (GOs) were successfully synthesized from graphite using Hummers’ method. The synthesized GOs were characterized in detail by SEM, AFM, XRD, and FTIR spectroscopy. The prepared GOs were used as adsorbents to preconcentrate Pb(II) ions from large volumes of aqueous solutions. The effects of pH, ionic strength and temperature on the removal of Pb(II) ions from solution to GOs were investigated. The sorption of Pb(II) on GOs was dependent on pH values and independent of ionic strength, which suggested that Pb(II) sorption on GOs was mainly dominated by strong inner-sphere surface complexation. The maximum adsorption capacities (Csmax) of Pb(II) on GOs were calculated to be 344 mg/g at 293 K, 487 mg/g at 308 K, and 758 mg/g at 333 K, respectively. The Csmax values are the highest sorption capacities of today’s materials for the sorption of Pb(II) ions from aqueous solutions. The thermodynamic parameters were calculated from the temperature-dependent sorption isotherms, and the results indicated that Pb(II) sorption on GOs was spontaneous and endothermic. The results suggested that the GOs were promising materials for the preconcentration of Pb(II) and other kinds of heavy metal ions from aqueous solutions in environmental pollution cleanup in real work.

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