4.5 Article

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

Journal

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 317, Issue 3, Pages 1377-1385

Publisher

SPRINGER
DOI: 10.1007/s10967-018-6009-8

Keywords

Carboxymethylated chitosan; Na-bentonite; Composite membrane; U(VI); Adsorption

Funding

  1. National Natural Science Foundation [21366001, 21667001, 21706028]
  2. Key Research and Development Program
  3. Natural Science Fund Program of Jiangxi Province [20161BBF60059, S2017ZRMSB0473, 20171BAB213016]

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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 UO2 (2+) 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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