Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5409549 | Journal of Molecular Liquids | 2016 | 28 Pages |
Abstract
Herein, the hydrothermal method was adopted to synthesize Fe3O4@MnO2 hollow spheres for the removal of U(VI) from aqueous solution. The effects of contact time, pH, ionic strength, solid content and temperature were investigated by using a batch technique. The sorption of U(VI) was dependent on ionic strength at pHÂ <Â 7, suggesting that electrostatic interaction and/or outer-sphere surface complexation was the predominant sequestration mechanism within this pH range. In contrast, the ignorable effect of ionic strength on the sorption behaviors at pHÂ >Â 7 pointed to the occurrence of inner-sphere surface complexation. Typical sorption isotherms (Langmuir, Freundlich, Dubinin-Raduskevich) were determined for the mechanism of sorption process. The maximum sorption amount of U(VI) on Fe3O4@MnO2 hollow spheres reached to 13.95Â mg/g at 293Â K. The thermo-dynamic parameters were calculated from the temperature isotherms, and the results suggested that U(VI) sorption on Fe3O4@MnO2 hollow spheres was a spontaneous and endothermic process. The results might be important for the application for U(VI) pollution management.
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Authors
Jian Zhang, Zhiqiang Guo, Yuan Li, Shuhao Pan, Xinlei Chen, Jinzhang Xu,