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In relation to this article, we declare that there is no conflict of interest.
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Received August 24, 2014
Accepted March 10, 2015
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Enhanced copper(II) biosorption on SiO2-alginate gel composite: A mechanistic study with surface characterization

Chemistry Department, Faculty of Engineering, Istanbul University, Avcilar 34320, Istanbul, Turkey
Korean Journal of Chemical Engineering, October 2015, 32(10), 2116-2123(8), 10.1007/s11814-015-0051-9
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Abstract

A new SiO2-alginate biocomposite was synthesized with improved mechanical properties, showing chelation capability of divalent metal ions, especially Cu(II), through its carboxylic acid ends. The biocomposite was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) techniques. The adsorption of copper(II) onto both H- and Ca-forms of sorbent was investigated as a function of pH and contact time, and adsorption data were modeled with the aid of Langmuir and Freundlich isotherms. The release of Ca(II) ions accompanying copper(II) binding was evaluated by selective surface complexation concept involving ion-exchange. The IR spectra gave detailed information on complexation of carbonyl group with copper ions and on the relative contribution of SiO2 involved in copper uptake. The adsorption edge of copper was within the pH range 4.0-5.5, and the sorbent capacity was determined as 1.85 and 1.10mmolg.1 for H- and Ca-forms, respectively.

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