Adsorption kinetic, isotherm and thermodynamic studies of Sr2+ onto hexagonal tungsten oxide

作者：Li Xingliang; Mu Wanjun; Liu Bijun; Zhong Wenbin; Wei Hongyuan; Jian Yuan; Zhong Zhengkun; Luo Shunzhong; Li Shoujian^*

来源：Journal of Radioanalytical and Nuclear Chemistry, 2013, 298(1): 47-53.

DOI：10.1007/s10967-013-2617-5

• Adsorption
• Hexagonal tungsten oxide
• Radioactive waste
• Sr2+ ion

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.

• 出版日期2013-10
• 单位四川大学