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

被引：1
|
作者：
Xingliang Li
Wanjun Mu
Bijun Liu
Wenbin Zhong
Hongyuan Wei
Yuan Jian
Zhengkun Zhong
Shunzhong Luo
Shoujian Li
机构：
[1] Sichuan University,College of Chemistry
[2] China Academy of Engineering Physics,Institute of Nuclear Chemistry and Physics
[3] Sichuan University,Institute of Nuclear Science and Technology
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2013年 / 298卷
关键词：
Adsorption; Hexagonal tungsten oxide; Radioactive waste; Sr; ion;
D O I：
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中图分类号：
学科分类号：
摘要：
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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页码：47 / 53
页数：6
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