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Adsorption of U(VI) onto the carboxymethylated chitosan/Na-bentonite membranes: kinetic, isothermic and thermodynamic studies

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Abstract

The carboxymethylated chitosan (CMC)/Na-bentonite (Na-Bt) composite membranes were prepared and throughly characterized. The Na-Bt/CMC mass ratio was optimized, and CB10 (membrane with Na-Bt/CMC mass ratio of 10%) was selected as the best membrane for U(VI) sorption. XPS analysis indicates that the main mechanism for UO22+ sorption onto CB10 is through inner-surface complexation. The sorption kinetics followed pseudo-second order model, indicating the chemisorption as the rate-controlling step. The U(VI) sorption on CB10 is endothermic and spontaneous, with the maximum mono-layer adsorption capacity of 115.6 mg/g at pH 5.0 and 298 K. Finally, the U(VI)-loaded CB10 can consecutively desorbed and reused for several cycles.

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation (21366001; 21667001; 21706028), the Key Research and Development Program and the Natural Science Fund Program of Jiangxi Province (20161BBF60059; S2017ZRMSB0473; 20171BAB213016).

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Authors and Affiliations

  1. State Key Laboratory for Nuclear Resources and Environment, East China University of Technology, 418 Guanglan Road, Nanchang, 330013, People’s Republic of China

    Limin Zhou, Jinbo Ouyang, Hamza Shehzad, Zhanggao Le & Zhao Li

  2. School of Chemical Sciences and Engineering, University of New South Wales, Sydney, 2035, Australia

    Limin Zhou & Adesoji A. Adesina

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  1. Limin Zhou
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  2. Jinbo Ouyang
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  3. Hamza Shehzad
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  4. Zhanggao Le
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  5. Zhao Li
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  6. Adesoji A. Adesina
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Correspondence to Limin Zhou.

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Zhou, L., Ouyang, J., Shehzad, H. et al. Adsorption of U(VI) onto the carboxymethylated chitosan/Na-bentonite membranes: kinetic, isothermic and thermodynamic studies. J Radioanal Nucl Chem 317, 1377–1385 (2018). https://doi.org/10.1007/s10967-018-6009-8

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  • DOI: https://doi.org/10.1007/s10967-018-6009-8

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