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Removal of Cu2+ and Pb2+ ions from aqueous solutions by starch-graft-acrylic acid/montmorillonite superabsorbent nanocomposite hydrogels

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Abstract

In this study, the removal of copper(II) and lead(II) ions from aqueous solutions by Starch-graft-acrylic acid/montmorillonite (S-g-AA/MMT) nanocomposite hydrogels was investigated. For this purpose, various factors affecting the removal of heavy metal ions, such as treatment time with the solution, initial pH of the solution, initial metal ion concentration, and MMT content were investigated. The metal ion removal capacities of copolymers increased with increasing pH, and pH 4 was found to be the optimal pH value for maximum metal removal capacity. Adsorption data of the nanocomposite hydrogels were modeled by the pseudo-second-order kinetic equation in order to investigate heavy metal ions adsorption mechanism. The observed affinity order in competitive removal of heavy metals was found Cu2+ > Pb2+. The Freundlich equations were used to fit the equilibrium isotherms. The Freundlich adsorption law was applicable to be adsorption of metal ions onto nanocomposite hydrogel.

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Acknowledgments

This work was supported by Research Fund of the İstanbul University, Project Number 418 and a part of the master thesis named ‘‘Preparation of the Starch Based Nanocomposite Hydrogels and Their Applications,’’ prepared at Istanbul University Institute of Science.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Istanbul University, Avcılar, 34320, Istanbul, Turkey

    Gamze Güçlü, Ebru Al, Serkan Emik, Tülin B. İyim & Saadet Özgümüş

  2. Department of Chemistry, Faculty of Engineering, Istanbul University, Avcılar, 34320, Istanbul, Turkey

    Mustafa Özyürek

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  1. Gamze Güçlü
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  2. Ebru Al
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  3. Serkan Emik
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  4. Tülin B. İyim
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  5. Saadet Özgümüş
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  6. Mustafa Özyürek
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Correspondence to Gamze Güçlü.

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Güçlü, G., Al, E., Emik, S. et al. Removal of Cu2+ and Pb2+ ions from aqueous solutions by starch-graft-acrylic acid/montmorillonite superabsorbent nanocomposite hydrogels. Polym. Bull. 65, 333–346 (2010). https://doi.org/10.1007/s00289-009-0217-x

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  • DOI: https://doi.org/10.1007/s00289-009-0217-x

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