Adsorption kinetic, isotherm and thermodynamic studies of Sr2+ onto hexagonal tungsten oxide

Hexagonal tungsten oxide ( hex -WO 3 ) with exchangeable sodium and ammonium cations located in hexagonal channel was synthesized by a facile hydrothermal treatment of sodium tungstate dihydrate in concentrated HCl solution in the presence of ammonium sulfate. An attempt was made to assess the poten...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2013-10, Vol.298 (1), p.47-53
Main Authors: Li, Xingliang, Mu, Wanjun, Liu, Bijun, Zhong, Wenbin, Wei, Hongyuan, Jian, Yuan, Zhong, Zhengkun, Luo, Shunzhong, Li, Shoujian
Format: Article
Language:English
Subjects:
Adsorption
Channels
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Isotherms
Mathematical models
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Sodium
Sodium tungstate
Thermodynamics
Tungsten oxides
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Summary:Hexagonal tungsten oxide ( hex -WO 3 ) with exchangeable sodium and ammonium cations located in hexagonal channel was synthesized by a facile hydrothermal treatment of sodium tungstate dihydrate in concentrated HCl solution in the presence of ammonium sulfate. An attempt was made to assess the potential of hex -WO 3 for the adsorption of Sr 2+ ions from acidic radioactive waste solutions. Adsorption of Sr 2+ reached equilibrium very quickly in 2 h in acidic aqueous solution. Maximum removal of Sr 2+ ions occurred at pH 4. Equilibrium studies showed that the extent of Sr 2+ ions uptake by hex -WO 3 was better described by the Freundlich isotherm in comparison with the Langmuir model. The thermodynamic parameters showed that the adsorption of Sr 2+ ions onto hex -WO 3 was spontaneous and exothermic under the studied conditions.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-013-2617-5