title: Strontium adsorption on tantalum-doped hexagonal tungsten oxide.
abstract: 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.
authors: 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. Electronic address: xingliang_li@163.com.
authors: Xingliang
authors: X
authors: Li
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Wanjun
authors: W
authors: Mu
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Xiang
authors: X
authors: Xie
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Bijun
authors: B
authors: Liu
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Hui
authors: H
authors: Tang
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Guanhong
authors: G
authors: Zhou
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China.
authors: Hongyuan
authors: H
authors: Wei
authors: 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.
authors: Yuan
authors: Y
authors: Jian
authors: Institute of Nuclear Chemistry and Physics, China Academy of Engineering Physics, Mianyang 621900, PR China. Electronic address: luoshzh@caep.ac.cn.
authors: Shunzhong
authors: S
authors: Luo
mesh_terms: D000327:Adsorption; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000302:isolation & purification*; D013635:Tantalum / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*
chemical_list: D010087:Oxides; D013635:Tantalum; C511604:tungsten oxide; D014414:Tungsten; D013324:Strontium
keywords: Adsorption; Hexagonal tungsten oxide; Radioactive waste; Sr(2+) ion; Ta-doped