Abstract
The removal of Th4+ ions from aqueous solutions was investigated using single-layer graphene oxide (GO) as a sorbent which was prepared by the modified Hummers’ method through batch adsorption experiments at room temperature. Structural characterizations of the sorbent were also investigated. The influences of the pH value of solution, contact time, sorbent dose, ionic strength, the initial metal ion concentration and temperature on the adsorption of Th4+ were also investigated. These results indicated that the adsorption of Th4+ was dependent on the pH and independent on the ionic strength. The sorbent provided significant Th4+ removal (>98.7 %) at pH 3.0 and the adsorption equilibrium was achieved after only 10 min. The Langmuir adsorption isotherm fit the absorption profile very closely, and indicated that a maximum adsorption capacity of 1.77 mmol g−1 of GO (411 mg g−1) after 2 h. The thermodynamic parameters showed that this adsorption process was endothermic and spontaneous. Moreover, the desorption level of Th4+ from GO, by using 0.1 mol L−1 H2SO4 as a stripping agent, was 84.2 ± 1.2 %, and that of 0.5 mol L−1 HNO3 as a stripping agent, was 79.8 ± 3.0 %.
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Acknowledgments
This research was financially supported by the International Collaboration Project of Science and Technology Program of Sichuan Province, China (Project no. 2010HH0008), the National Fund for Fostering Talents of Basic Science (J1210004), the Science and Technology Fund of CAEP (2011B0302052) and the National Natural Science Foundations of China (91023037).
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Pan, N., Guan, D., He, T. et al. Removal of Th4+ ions from aqueous solutions by graphene oxide. J Radioanal Nucl Chem 298, 1999–2008 (2013). https://doi.org/10.1007/s10967-013-2660-2
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DOI: https://doi.org/10.1007/s10967-013-2660-2