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Chelating exchanger for Removal of Calcium(II) and Magnesium (II) ions

Author Affiliations

  • 1School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala -686560, INDIA

Res. J. Recent Sci., Volume 3, Issue (ISC-2013), Pages 319-323, (2014)

Abstract

The NR/PEO block copolymeric hydrogel can act as chelating exchangers due to the presence of electron donor oxygen atoms of PEO. So they can form metal complexes and can remove metals from aqueous medium. The effect of initial metal ion concentration on the metal ion adsorption capacity was investigated for Ca2+ and Mg2+ metal ions from aqueous solution. The linear regression coefficient R was used to elucidate the best fitting isotherm model. Here from the linear regression coefficient it is found that Freundlich equation was best fit for both the metal ions and the 1/n value is approximately equal to 1 indicating linear adsorption leading to identical adsorption energies for all sites. The adsorption capacity of NR/PEO block copolymer increases with metal ion concentration and this trend is shown by calcium and magnesium. At 0.02M concentration magnesium shows highest adsorption capacity.

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