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Adsorption kinetic, isotherm and thermodynamic studies of Sr2+ onto hexagonal tungsten oxide |
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| Authors: | Xingliang Li Wanjun Mu Bijun Liu Wenbin Zhong Hongyuan Wei Yuan Jian Zhengkun Zhong Shunzhong Luo Shoujian Li |
| Institution: | 1. College of Chemistry, Sichuan University, 29# Wangjiang Road, Chengdu, 610064, Sichuan, China 2. Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, 64# Mianshan Road, Mianyang, 621900, Sichuan, China 3. Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, China |
| 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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