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J. Funct. Biomater. 2018, 9(3), 49; https://doi.org/10.3390/jfb9030049

Experimental and Theoretical Studies on the Adsorption Mechanisms of Uranium (VI) Ions on Chitosan

1
Department of Chemical System Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2
Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-Nocho, Nishi-ku, Niigata 950-2181, Japan
3
Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-Nocho, Nishi-ku, Niigata 950-2181, Japan
*
Author to whom correspondence should be addressed.
Received: 11 June 2018 / Revised: 4 August 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
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Abstract

An experiment on the adsorption of uranium (VI) by chitosan was conducted to investigate the efficiency of chitosan as an adsorbent for U(VI). The adsorption potential of U(VI) by chitosan was investigated with ICP-MS by varying the experimental conditions such as the pH in order to obtain the optimum conditions. Adsorption dependence on the pH was confirmed, and the highest uptake of U(VI) was observed at pH 5. In addition, to scrutinize the experimental results, quantum chemistry calculations were performed. The results, taking into account the experimental conditions, show that the adsorption efficiency increases as the total charge of the adsorbent and adsorbate species decreases if both of them are positively charged. It was also found that a slight change in the adsorption geometric configuration controls the adsorption efficiency. View Full-Text
Keywords: chitosan; uranium (VI) ions; quantum chemistry calculation; pH dependence; adsorption; charges; molecular geometries chitosan; uranium (VI) ions; quantum chemistry calculation; pH dependence; adsorption; charges; molecular geometries
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Mishima, K.; Du, X.; Miyamoto, N.; Kano, N.; Imaizumi, H. Experimental and Theoretical Studies on the Adsorption Mechanisms of Uranium (VI) Ions on Chitosan. J. Funct. Biomater. 2018, 9, 49.

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