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Adsorption of uranium from aqueous solution by graphene oxide nanosheets supported on sepiolite

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Abstract

Adsorptive behavior of uranium from aqueous solution on graphene oxide supported on sepiolite composites (GO@sepiolite composites) as a function of pH, ionic strength, temperature and initial uranium concentration was carried out by the batch techniques. GO@sepiolite composites was synthesized and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and potentiometric acid–base titration. According to XRD patterns and SEM images, the graphene oxide nanosheets were grafted on sepiolite surface successfully. The macroscopic results showed that the adsorption of uranium on GO@sepiolite composites was significantly depended on pH, whereas no effect of ionic strength on uranium adsorption at high pH and high ionic strength conditions was observed. The uptake equilibrium is best described by Langmuir adsorption isotherm, and the maximum adsorption capacity (Qe) of GO@sepiolite composites at pH 5.0 and T = 298 K were calculated to be 161.29 mg/g. Thermodynamic results indicated that the adsorption of uranium on GO@sepiolite composites is the spontaneous and exothermic process.

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Acknowledgments

Funding for this research was supported from National Natural Science Foundation of China (40372109, 41003015).

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Authors and Affiliations

  1. School of Water Resource and Environment, China University of Geoscience, Bei**g, 100083, People’s Republic of China

    Huangxin Cheng

  2. School of Public Administration, China University of Geoscience, Wuhan, 430074, Hubei, People’s Republic of China

    Kefeng Zeng

  3. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, People’s Republic of China

    Jitao Yu

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  1. Huangxin Cheng
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  2. Kefeng Zeng
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Correspondence to Jitao Yu.

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Cheng, H., Zeng, K. & Yu, J. Adsorption of uranium from aqueous solution by graphene oxide nanosheets supported on sepiolite. J Radioanal Nucl Chem 298, 599–603 (2013). https://doi.org/10.1007/s10967-012-2406-6

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