Strontium adsorption on tantalum-doped hexagonal tungsten oxide

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• 作者：Xingliang Li ; Wanjun Mu ; Xiang Xie ; Bijun Liu ; Hui Tang ; Guanhong Zhou ; Hongyuan Wei ; Yuan Jian ; Shunzhong Luo
• 关键词：Adsorption ; Ta-doped ; Hexagonal tungsten oxide ; Radioactive waste ; Sr2+ ion
• 刊名：Journal of Hazardous Materials
• 出版年：15 January, 2014
• 年：2014
• 卷：264
• 期：Complete
• 页码：386-394
• 全文大小：1991 K

文摘

Hexagonal tungsten oxide (hex-WO₃) has the potential to separate ¹³⁷Cs and ⁹⁰Sr from nuclear power plant or fission ⁹⁹Mo production waste. This study aims to increase the capacity of hex-WO₃ to adsorb Sr²⁺. Ta-doped hex-WO₃ was synthesized by the hydrothermal treatment of sodium tungstate dihydrate and tantalum chloride in concentrated HCl, in the presence of ammonium sulfate. Incorporating Ta into the WO₃ framework caused the interlayer spacing to expand, and the band gap to shift to higher energy. The Sr²⁺ adsorption capacity of Ta-doped hex-WO₃ was significantly higher than that of hex-WO₃. Sr²⁺ adsorption reached equilibrium within 2 h in acidic solution. Maximum Sr²⁺ removal occurred at pH 4. Sr²⁺ uptake by hex-WO₃ was described better by the Freundlich model than by the Langmuir model. Sr²⁺ adsorption on hex-WO₃ was spontaneous under the studied conditions.