Abstract
The ability of ordered mesoporous carbon CMK-3 has been explored for the removal and recovery of thorium from aqueous solutions. The textural properties of CMK-3 were characterized using small-angle X-ray diffraction and N2 adsorption–desorption, and the BET specific surface area, pore volume and the pore size were 1143.7 m2/g, 1.10 cm3/g and 3.4 nm. The influences of different experimental parameters such as solution pH, initial concentration, contact time, ionic strength and temperature on adsorption were investigated. The CMK-3 showed the highest thorium sorption capacity at initial pH of 3.0 and contact time of 175 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir isotherm. The thermodynamic parameters, △G°(298 K), △H° and △S° were determined to be -0.74 kJ·mol−1, 9.17 kJ·mol−1 and 33.24 J·mol−1·K−1, respectively, which demonstrated the sorption process of CMK-3 towards Th(IV) was feasible, spontaneous and endothermic in nature. The adsorbed CMK-3 could be effectively regenerated by 0.02 mol/L HCl solution for the removal and recovery of Th(IV).
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Acknowledgments
We gratefully acknowledge the financial support provided by National Natural Science Foundation of China (Grant Nos. 21101024, 21201033), Key Project of Chinese Ministry of Education (Grant No. 211086), Natural Science Foundation of Jiangxi Province (Grant Nos. 20114BAB203002, 20122BAB203012), China Postdoctoral Science Foundation (Grant No. 20110490857), and Project of Jiangxi Provincial Department of Education (Grant Nos. GJJ13452), and the Open Project Foundation of the Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense of China (Grant No. RGET1218).
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Zhang, Zb., Zhou, Yd., Liu, YH. et al. Removal of thorium from aqueous solution by ordered mesoporous carbon CMK-3. J Radioanal Nucl Chem 302, 9–16 (2014). https://doi.org/10.1007/s10967-014-3304-x
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DOI: https://doi.org/10.1007/s10967-014-3304-x