Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (8): 2052-2058.doi: 10.3866/PKU.WHXB201604213

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Removal of Sr2+ Ions by Ta-Doped Hexagonal WO3: Zeta Potential Measurements and Adsorption Mechanism Determination

Yuan JIAN1,2,*(),Wan-Jun MU2,Ning LIU1,Shu-Ming PENG1,2,*()   

  1. 1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, P. R. China
    2 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China
  • Received:2016-02-29 Published:2016-07-29
  • Contact: Yuan JIAN,Shu-Ming PENG E-mail:inpc207@163.com;pengsm01@163.com
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21501159)

Abstract:

The adsorption of Sr2+ ions onto Ta-doped hex-WO3 nanomaterials was studied by measuring the zeta potentials of the powder nanoparticles and by determining the adsorption isotherm and adsorption mechanism. Five important results were obtained: (1) the zeta potential values of the Ta-doped hex-WO3 suspensions in different electrolyte solutions, within the studied pH ranges, increased with an increase in electrolyte valence; and (2) the zeta potential of the Ta-doped hex-WO3 suspensions increased with an increase in ionic strength. (3) Sr2+ ion adsorption increased with a decrease in temperature and ionic strength. (4) The adsorption enthalpy was calculated as-47 kJ·mol-1, and the interaction between the Ta-doped hex-WO3 surface and Sr2+ ions was concluded to be chemical in nature. (5) The adsorption of Sr2+ ions onto the Ta-doped hex-WO3 was attributed to surface chemical adsorption and ion exchange (in tunnels).

Key words: Ta, hex-WO3, Zeta potential, Sr2+, Adsorption mechanism

MSC2000: 

  • O647