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Equilibrium, Kinetic and Thermodynamic Studies Of Lead (II) Sorption on Hydrolyzed Starch Graft Copolymers

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Abstract

Hydrolyzed starch graft poly (acrylic acid) and starch graft poly(acrylonitrile) copolymers were used as a sorbents for the removal of Pb(II) from aqueous solution in batch process. The sorbents were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. The effect of contact time, initial concentration and temperature were assessed to optimize the conditions for maximum sorption of the metal ions. The experimental data were analyzed by Langmuir, Freundlich, Temkin, Dubinin Radushkevich and Sips isotherm models. The Freundlich and the Sips isotherms confirmed the applicability of the models. The sorption capacity of the sorbent was found to be 118.61 mg/g for starch graft poly (acrylic) acid and 115.83 mg/g for starch graft poly (acrylonitrile). The Sorption kinetics was assessed by Lagergren pseudo first order, pseudo second order, Elovich equation, Intraparticle diffusion and the liquid film diffusion models. The experimental data fitted very well with the Elovich equation and the Intraparticle kinetic models. The thermodynamic analysis showed that the sorption was a spontaneous and endothermic process. The results indicated that starch graft copolymers can be used as an effective sorbents for Pb (II) removal from aqueous media.

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Authors and Affiliations

  1. Department of Chemistry, Biomaterials Research Centre, University of Benin, Benin City, Nigeria

    Lawrence O. Ekebafe, David E. Ogbeifun & Felix E. Okieimen

  2. Polymer Technology Department, Auchi Polytechnic, Auchi, Nigeria

    Lawrence O. Ekebafe

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  1. Lawrence O. Ekebafe
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  2. David E. Ogbeifun
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  3. Felix E. Okieimen
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Correspondence to Lawrence O. Ekebafe.

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Ekebafe, L.O., Ogbeifun, D.E. & Okieimen, F.E. Equilibrium, Kinetic and Thermodynamic Studies Of Lead (II) Sorption on Hydrolyzed Starch Graft Copolymers. J Polym Environ 26, 807–818 (2018). https://doi.org/10.1007/s10924-017-0949-x

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