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

Document Type : Research Paper

Authors

1 Department of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran

2 Department 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. 

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References

[1] Liu, T., Yang, X., Wang, Z. L., Yan, X. (2013). Enhanced chitosan beads-supported Fe 0-nanoparticles for removal of heavy metals from electroplating wastewater in permeable reactive barriers. Water research, 47(17), 6691-6700.
[2] Hossain, M. A., Ngo, H. H., Guo, W. S., Setiadi, T. (2012). Adsorption and desorption of copper (II) ions onto garden grass. Bioresource technology, 121, 386-395.
[3] Qaiser, S., Saleemi, A. R., Umar, M. (2009). Biosorption of lead from aqueous solution by Ficus religiosa leaves: batch and column study. Journal of hazardous materials, 166(2), 998-1005.
[4] Wu, G., Kang, H., Zhang, X., Shao, H., Chu, L., Ruan, C. (2010). A critical review on the bio-removal of hazardous heavy metals from contaminated soils: issues, progress, eco-environmental concerns and opportunities. Journal of hazardous materials, 174(1), 1-8.
[5] Nayek, S., Gupta, S., Saha, R. N. (2010). Metal accumulation and its effects in relation to biochemical response of vegetables irrigated with metal contaminated water and wastewater. Journal of hazardous materials, 178(1), 588-595.
[6] Vijayaraghavan, K., Prabu, D. (2006). Potential of Sargassum wightii biomass for copper (II) removal from aqueous solutions: Application of different mathematical models to batch and continuous biosorption data. Journal of hazardous materials, 137(1), 558-564.
[7] Zhuang, Y., Yu, F., Chen, J., Ma, J. (2016). Batch and column adsorption of methylene blue by graphene/alginate nanocomposite: Comparison of single-network and double-network hydrogels. Journal of environmental chemical engineering, 4(1), 147-156.
[8] Mohammed, N., Grishkewich, N., Waeijen, H. A., Berry, R. M., Tam, K. C. (2016). Continuous flow adsorption of methylene blue by cellulose nanocrystal-alginate hydrogel beads in fixed bed columns. Carbohydrate polymers, 136, 1194-1202.
[9] Lawrie, G., Keen, I., Drew, B., Chandler-Temple, A., Rintoul, L., Fredericks, P., Grøndahl, L. (2007). Interactions between alginate and chitosan biopolymers characterized using FTIR and XPS. Biomacromolecules, 8(8), 2533-2541.
[10] An, B., Lee, H., Lee, S., Lee, S. H., Choi, J. W. (2015). Determining the selectivity of divalent metal cations for the carboxyl group of alginate hydrogel beads during competitive sorption. Journal of hazardous materials, 298, 11-18.
[11] Vijayalakshmi, K., Gomathi, T., Latha, S., Hajeeth, T., Sudha, P. N. (2016). Removal of copper (II) from aqueous solution using nanochitosan/sodium alginate/microcrystalline cellulose beads. International journal of biological macromolecules, 82, 440-452
Advances in Environmental Technology
Volume 3, Issue 4
October 2017
Pages 185-192

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History

  • Receive Date: 05 August 2017
  • Revise Date: 30 November 2017
  • Accept Date: 13 December 2017

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