Abstract
Hexagonal tungsten oxide (hex-WO3) with exchangeable sodium and ammonium cations located in hexagonal channel was synthesized by a facile hydrothermal treatment of sodium tungstate dihydrate in concentrated HCl solution in the presence of ammonium sulfate. An attempt was made to assess the potential of hex-WO3 for the adsorption of Sr2+ ions from acidic radioactive waste solutions. Adsorption of Sr2+ reached equilibrium very quickly in 2 h in acidic aqueous solution. Maximum removal of Sr2+ ions occurred at pH 4. Equilibrium studies showed that the extent of Sr2+ ions uptake by hex-WO3 was better described by the Freundlich isotherm in comparison with the Langmuir model. The thermodynamic parameters showed that the adsorption of Sr2+ ions onto hex-WO3 was spontaneous and exothermic under the studied conditions.
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The financial support from the National Natural Science Foundation of China (Grant 41103077) and China Academy of Engineering Physics is gratefully acknowledged.
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Li, X., Mu, W., Liu, B. et al. Adsorption kinetic, isotherm and thermodynamic studies of Sr2+ onto hexagonal tungsten oxide. J Radioanal Nucl Chem 298, 47–53 (2013). https://doi.org/10.1007/s10967-013-2617-5
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DOI: https://doi.org/10.1007/s10967-013-2617-5