Copolymer was synthesized by condensation of p-Cresol (p-C) and Adipamide (A) with Formaldehyde (F) in the presence of 2M HCl as catalyst with 4:1:5 molar ratios of reacting monomers. Water is the most important constituent of our body. Thus, its quality should be good and perfect because it directly affects our health. Water pollution due to arsenic leaching is one of the biggest problems all over the world. Ion-exchange studies of this purified copolymer resin were carried out for As3+ ions. ‘A’ proved to be a selective chelating ion-exchange copolymer for certain metals. Chelating ionexchange properties of this copolymer were studied for As3+ ions. Batch equilibrium method was employed to study the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The copolymer showed a higher selectivity for As3+ ions.

Many copolymers with reactive groups are now being synthesized, tested and used not only for the macromolecular properties, but also for the properties of functional groups. These functional groups provide an approach to a subsequent modification of the copolymers for specific end application (Atia et al., 2005). In recent years, some comprehensive work has been published on functional monomers and their copolymers (Nabi et al., 2005), the interaction of heavy metal ions (Liu et al., 2000) and chelating ionexchange resin containing 8-Hydroxyquinoline (8-HQ) . The resin has good selectivity to exchangeable adsorption of heavy metal ions indicating Cu (II), Hg (II), Pb (II) and Mg (II) under pH 5.0 and also suggests that the chelating ion-exchange resin containing 8-HQ could be used to enrich heavy metals in water and their analysis. Bekir ( 2002) has prepared modified 1, 4, 8, 11-tetraazocyclotridecane (cyclam) and with an Azobisisobutyronitrile (AIBN) initiator polymerized the modified cyclam. Cyclam containing polymer in bulk structure was removed from the suspension by filtration after washing and drying. The polymeric materials were used for transition metal ion adsorption and desorption of selected ions: Copper (Cu) (II), Nickel (Ni) (II), Cobalt (Co) (II), Cadmium (Cd) (II), and Lead (Pb) (II) from aqueous media containing different amounts of these metal ions at different pH values. The adsorption rates were high and the adsorption equilibrium was reached in about 30 min. The affinity order of the transition metal ions was Cu (II) > Ni (II) > Co (II) > Cd (II) > Pb for competitive adsorption. The chelating ionexchange properties of 8-Hydroxy maleimine formaldehyde (8-HQMF) (Gurnule et al., 2001) were studied for Cu+2, Ni+2, Co+2, Zinc (Zn+2), Cd+2, Iron (Fe+3) and Pb+2 ions. Batch equilibrium method was used to study the selectivity of the metal ion uptake by measuring the distribution of a metal ion between the resin sample and solution containing the metal ion. The study was carried out at different pH ranges and in a medium of different ionic strengths. The copolymer showed higher selectivity for Fe (III), Cu (II) and Ni (II) ions than Co (II), Zn (II), Cd (II) and Pb (II) ions. A chelating terpolymer resin was synthesized using an eco-friendly technique and was reported to have good binding capacity for Barium (Ba2+) and Zn2+ ions (Azarudeen et al., 2009). Recently, the chelating ability of the resin was synthesized by microwave irradiation technique involving salicylic acid and formaldehyde (Shah et al., 2008).

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