Preparation, Characterization, and Application of Graphene鈥揨inc Oxide Composites (G鈥揨nO) for the Adsorption of Cu(II), Pb(II), and Cr(III)

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• 作者：Xiaowei Zhao ; Bin Hu ; Juanjuan Ye ; Qiong Jia
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：58
• 期：9
• 页码：2395-2401
• 全文大小：370K
• 年卷期：v.58,no.9(September 12, 2013)
• ISSN：1520-5134

文摘

In the present study, graphene鈥搝inc oxide composites (G鈥揨nO) were prepared and applied to the adsorption of Cu(II), Pb(II), and Cr(III) from aqueous solutions. The synthesized composites were characterized by X-ray diffraction and transmission electron microscopy. Effects of pH and contact time were studied in batch experiments. Kinetics, adsorption isotherms, and thermodynamics were also examined. Kinetics experiments indicated that the processes could be simulated by a pseudo-second-order model. The experimental results of equilibrium adsorption were tested by Langmuir and Freundlich isotherms, indicating that the former fit the data better. Thermodynamic parameters, the Gibbs free energy change (螖G), enthalpy change (螖H), and entropy change (螖S), were calculated, indicating that the adsorption of heavy metals onto G鈥揨nO was spontaneous and endothermic in nature.