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Acta Physico-Chimica Sinca  2016, Vol. 32 Issue (8): 2052-2058    DOI: 10.3866/PKU.WHXB201604213
ARTICLE     
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 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
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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 wordsTa      hex-WO3      Zeta potential      Sr2+      Adsorption mechanism     
Received: 29 February 2016      Published: 21 April 2016
MSC2000:  O647  
Fund:  The project was supported by the National Natural Science Foundation of China(21501159)
Corresponding Authors: Yuan JIAN,Shu-Ming PENG     E-mail: inpc207@163.com;pengsm01@163.com
Cite this article:

Yuan JIAN,Wan-Jun MU,Ning LIU,Shu-Ming PENG. Removal of Sr2+ Ions by Ta-Doped Hexagonal WO3: Zeta Potential Measurements and Adsorption Mechanism Determination. Acta Physico-Chimica Sinca, 2016, 32(8): 2052-2058.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201604213     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I8/2052

 
 
 
 
 
 
 
 
 
 
 
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