The adsorption efficiency of Sr2+ and Ba2+ from aqueous solutions by zeolite 4A was investigated. Adsorption studies were carried out both in single and binary component systems. The single ion equilibrium adsorption data were fitted to three isotherm models: Langmuir, Freundlich and Dubinin–Radushkevich. The Langmuir model represents the equilibrium data better than the Freundlich model in the studied initial metal concentration (0.3–25 mmol L−1) in both the single and binary component systems. The obtained RL (separation factor or Langmuir parameter) values were in the range of 0–1 indicating that Sr2+ and Ba2+ sorption were favorable. The obtained mean free energy value for adsorption of Ba2+ and Sr2+ was 8.45 kJ mol−1 and 9.12 kJ mol−1, respectively, indicating that both ions were uptaken through an ion exchange process. The maximum adsorption capacities (Qmax) were 2.25 mmol g−1 and 2.34 mmol g−1 for Ba2+ and Sr2+ ions, respectively. Also, the study of the competitive sorption of ions in the binary system showed that zeolite 4A preferentially adsorbs cations in the following order: Ba2+ < Sr2+.
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Research Article|
December 23 2015
Removal of barium and strontium from aqueous solution using zeolite 4A
Manel Araissi;
Manel Araissi
1Materials, Environment and Energy Laboratory (UR14ES26), Science Faculty of Gafsa, University of Gafsa, Gafsa 2112, Tunisia
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Imen Ayed;
Imen Ayed
1Materials, Environment and Energy Laboratory (UR14ES26), Science Faculty of Gafsa, University of Gafsa, Gafsa 2112, Tunisia
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Elimame Elaloui;
Elimame Elaloui
1Materials, Environment and Energy Laboratory (UR14ES26), Science Faculty of Gafsa, University of Gafsa, Gafsa 2112, Tunisia
2Science Faculty of Gafsa, University of Gafsa, Gafsa 2112, Tunisia E-mail: [email protected]
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Younes Moussaoui
Younes Moussaoui
2Science Faculty of Gafsa, University of Gafsa, Gafsa 2112, Tunisia E-mail: [email protected]
3Physical Organic Chemistry Laboratory (UR11ES74), Science Faculty of Sfax, University of Sfax, Sfax 3018, Tunisia
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Water Sci Technol (2016) 73 (7): 1628–1636.
Article history
Received:
April 25 2015
Accepted:
December 08 2015
Citation
Manel Araissi, Imen Ayed, Elimame Elaloui, Younes Moussaoui; Removal of barium and strontium from aqueous solution using zeolite 4A. Water Sci Technol 7 April 2016; 73 (7): 1628–1636. doi: https://doi.org/10.2166/wst.2015.640
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