Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China; Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, PR China.
Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
J Hazard Mater. 2014 Jan 15;264:386-94. doi: 10.1016/j.jhazmat.2013.11.032. Epub 2013 Nov 22.
Hexagonal tungsten oxide (hex-WO3) has the potential to separate (137)Cs and (90)Sr from nuclear power plant or fission (99)Mo production waste. This study aims to increase the capacity of hex-WO3 to adsorb Sr(2+). 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 Sr(2+) adsorption capacity of Ta-doped hex-WO3 was significantly higher than that of hex-WO3. Sr(2+) adsorption reached equilibrium within 2h in acidic solution. Maximum Sr(2+) removal occurred at pH 4. Sr(2+) uptake by hex-WO3 was described better by the Freundlich model than by the Langmuir model. Sr(2+) adsorption on hex-WO3 was spontaneous under the studied conditions.
六方氧化钨（hex-WO3）有可能从核电站或裂变（99）Mo 生产废物中分离（137）Cs 和（90）Sr。本研究旨在提高 hex-WO3 吸附 Sr(2+)的能力。采用水热法在浓 HCl 存在下，由仲钨酸铵二水合物和四氯化钽合成 Ta 掺杂的六方氧化钨。Ta 掺入 WO3 骨架会导致层间距扩大，带隙向高能方向移动。Ta 掺杂的六方氧化钨对 Sr(2+)的吸附容量明显高于六方氧化钨。在酸性溶液中，Sr(2+)吸附在 2h 内达到平衡。最大 Sr(2+)去除发生在 pH 值为 4。Freundlich 模型比 Langmuir 模型更能描述 Sr(2+)在 hex-WO3 上的吸附。在研究条件下，Sr(2+)在 hex-WO3 上的吸附是自发的。
