Copolymer resin (2,4-DHBEDF) has been synthesized by the condensation polymerization of 2,4-dihyroxybenzoic acid and ethylene diamine with formaldehyde in the presence of acid catalyst, was proved to be selective chelation ion-exchange resin for certain heavy metals. The chelating ion-exchange properties of these copolymer was studied for Fe(III), Cu(II), Ni(II), Co(II), and Pb(II) ions in the form of their metal nitrate solutions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range, shaking time and in media of various ionic strengths of different electrolytes. The ion-exchange capacity of metal ions has also been determined experimentally and compared with other commercial resins. Besides ion-exchange properties, the copolymer resin was also characterized by viscometric measurements in dimethyl sulphoxide (DMSO), UV-visible absorption spectra in non-aqueous medium, infra-red spectra, nuclear magnetic resonance spectra and C13 NMR spectra. The physico-chemical and spectral methods were used to elucidate the structures of 2,4-DHBEDF resin. The morphology of the copolymer was studied by scanning electron microscopy; showing amorphous nature of the resins therefore can be used as a selective ionexchanger for certain metal ions.
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