Abstract
Terpolymer resin 4-ASAUF was synthesized by the condensation of 4-aminosalicylic acid (4-ASA) and urea (U) with formaldehyde (F) in the presence of 2 N hydrochloric acid. The structure of the resin was characterized by various spectral techniques like infrared (FTIR) and nuclear magnetic resonance (1H and 13C-NMR) spectroscopy. The empirical formula and empirical weight of the resin were determined by elemental analysis. The physiochemical properties of terpolymer resin were determined. The morphological feature of the 4-ASAUF terpolymer resin was studied by scanning electron microscopy (SEM). The chelating ion-exchange property of this copolymer was studied for eight metal ions, namely, Fe3+, Cu2+, Ni2+, Co2+, Hg2+, Zn2+, Cd2+, and Pb2+ ions by using batch equilibrium method. The chelating ion-exchange study was carried out over a wide pH range at different time intervals using different electrolyte of various ionic strengths.
Highlights
Ion-exchange process is efficient and eco-friendly extraction technique for the separation of metal ions and recovery of toxic heavy metal ions from the industrial wastes, tannery effluents and sewages, and so forth [1, 2]
The chemically modified silica gel N-(1-carboxy6 hydroxy) benzylidenepropylamine was used as an ionexchanger for the removal and preconcentration of hazardous metal ions such as Cr, Mn, Cd, and Pb in natural water samples using batch equilibrium method and atomic absorption spectroscopy (AAS) technique [7]
The present paper explored the newly synthesized terpolymer resin 4-aminosalicylic acid-urea-formaldehyde (4ASAUF) in the light of its physiochemical, spectral, and chelating ion-exchange study
Summary
Ion-exchange process is efficient and eco-friendly extraction technique for the separation of metal ions and recovery of toxic heavy metal ions from the industrial wastes, tannery effluents and sewages, and so forth [1, 2]. The metal absorption of copolymer gel poly(HPMA-co-IA) and poly(HPMA-co-CA) increases with pH and study proved that poly(HPMA-co-IA) and poly(HPMA-co-CA) could be used as metal absorbents for Cd2+ and Pb2+ ions [8]. Rahangdale et al and Tarase et al investigated the chelation ion-exchange properties of resin prepared from 2,4-dihydroxyacetophenone-biuretformaldehyde terpolymers and 2,4-dihydroxybenzaldehyde, oxamide, and formaldehyde, respectively [9, 10]. The chelation ion-exchange properties of copolymer resin derived from 8-hydroxyquinoline 5-sulfonic acid, oxamide, and formaldehyde indicated that the copolymer had greater selectivity for Fe2+, Cu2+, and Ni2+ ions than for Co2+, Zn2+, Cd2+, and Pb2+ ions [11]. The metal ion-binding properties of a copolymer resin derived from o-aminophenol, melamine, and formaldehyde have been reported for the metal ions Fe3+, Zn2+, Cu2+, Pb2+, Cd2+, and Hg2+ [12].
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