Abstract
The mesoporous silicas (MCM-41 and MCM-48) are synthesized by hydrothermal method, which are characterized by XRD and BET techniques. The application of mesoporous silicas for the sorption of U(VI) from aqueous solution are studied by using batch technique under ambient condition. The effects of contact time, solid-to-liquid ratio (m/V), solution pH, ionic strength and temperature are determined, and the results indicate that the sorption of U(VI) to MCM-41 or MCM-48 are strongly dependent on pH values but independent of ionic strength. Compared with Langmuir model, the sorption isotherms can be simulated by Freundlich model well according to the high relative coefficients. The parameters for Langmuir and Freundlich sorption isotherms are calculated from the temperature at 298, 318 and 338 K, respectively, and the results suggest that the sorption of U(VI) on MCM-41 or MCM-48 is a spontaneous and exothermic process. In contrast to its sorption capacity for U(VI), MCM-48 is a suitable material for the preconcentration of U(VI) from large volumes of aqueous solutions.
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Financial support from National Natural Science Foundation of China (21101082, J0630962).
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Chen, SW., Guo, BL., Wang, YL. et al. Study on sorption of U(VI) onto ordered mesoporous silicas. J Radioanal Nucl Chem 295, 1435–1442 (2013). https://doi.org/10.1007/s10967-012-1998-1
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DOI: https://doi.org/10.1007/s10967-012-1998-1
Keywords
- Mesoporous silicas
- Sorption
- U(VI)
- Freundlich model