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Advances in Environmental Technology
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Volume Volume 3 (2017)
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barekat, A., Mirzaei, M. (2017). Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite. Advances in Environmental Technology, 3(4), 185-192. doi: 10.22104/aet.2017.621
afsaneh barekat; Masoomeh Mirzaei. "Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite". Advances in Environmental Technology, 3, 4, 2017, 185-192. doi: 10.22104/aet.2017.621
barekat, A., Mirzaei, M. (2017). 'Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite', Advances in Environmental Technology, 3(4), pp. 185-192. doi: 10.22104/aet.2017.621
barekat, A., Mirzaei, M. Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite. Advances in Environmental Technology, 2017; 3(4): 185-192. doi: 10.22104/aet.2017.621

Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite

Article 1, Volume 3, Issue 4, Autumn 2017, Page 185-192  XML PDF (1329 K)
Document Type: Research Paper
DOI: 10.22104/aet.2017.621
Authors
afsaneh barekat 1; Masoomeh Mirzaei2
1Department of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
2Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
Abstract
The study presented in this article investigated the removal of copper ions from aqueous solutions by a synthetic hydrogel-forming adsorbent polymer based on sodium alginate (SA) and hydroxy apatite (HA) nanoparticles. The effect of adding Zeolite on the adsorption performance of this hydrogel was also investigated, and the optimum amount of Zeolite was determined by changing its quantity. The FTIR spectrum determined the structure of the synthesized adsorbent; non-continuous adsorption tests were performed to study the kinetics and thermodynamics of adsorption and also the recovery of the adsorbent. The degree of adsorption of the synthesized nanocomposite was compared with that of Zeolite, and the results showed that the maximum adsorption capacities of Zeolite and the nanocomposite for Cu ions were 29.7 and 75.8 mg/g, respectively. The kinetic studies indicated that the process of adsorption of Cu ions on both absorbents followed a pseudo second order kinetic equation. It took the Zeolite and the hydrogel 90 and 120 minutes, respectively, to reach equilibrium. The thermodynamic studies showed that Cu absorption by both adsorbents matched the Langmuir isotherm very well (R2=0.99). Since adsorbent recovery and its lifespan are of significant importance in absorption processes, recovery was carried out by hydrochloric acid (2% by weight). The repulsion coefficient of the recovered adsorbent and its efficiency in five recovery cycles were measured. The results of the tests indicated that the repulsion coefficient of Cu was 70-82.75 percent and the adsorption efficiency of Cu after 5 recovery cycles was 75 percent of the initial adsorbent. 
Keywords
Copper; Hydrogel; Zeolite; Sodium alginate; Adsorption
Main Subjects
water and wastewater treatment
References
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