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- Title
Removal of strontium and barium from aqueous solutions by adsorption onto expanded perlite.
- Authors
Torab-Mostaedi, Meisam; Ghaemi, Ahad; Ghassabzadeh, Hamid; Ghannadi-Maragheh, Mohammad
- Abstract
The adsorption of strontium and barium from aqueous solution onto expanded perlite (EP) has been investigated as a function of pH, contact time, adsorbent dosage, and temperature. Sorption experiments indicated that the sorption capacity was dependent on operating variables and the process was strongly pH-dependent. Equilibrium isotherm data were analysed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models. The adsorption was well described by Langmuir isotherm model. The maximum adsorption capacity was found to be 1.14 and 2.486 mg/g for Sr (II) and Ba (II) from the Langmuir isotherm model at 20°C, respectively. Two simplified kinetic models viz. pseudo-first-order and pseudo-second-order models were tested to describe the adsorption process. The kinetic data indicated that adsorption fitted well with the pseudo-second-order kinetic model. Using the equilibrium constant value obtained at four (20, 30, 40, and 50°C) different temperatures, the thermodynamic parameters of the adsorption (Δ G°, Δ H°, and Δ S°) were also determined. The results showed that the adsorption of Sr (II) and Ba (II) ions on EP was exothermic and spontaneous.
- Subjects
STRONTIUM; BARIUM; PERLITE; HYDROGEN-ion concentration; TEMPERATURE
- Publication
Canadian Journal of Chemical Engineering, 2011, Vol 89, Issue 5, p1247
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.20486