Abstract
ABSTRACT A new oxime containing polymer, Poly(salicylaldoxime-3,5-diyl (N,N′-dimethylethylenediamine N,N′-bismethylene)), polymer 1, was prepared through a Mannich-type condensation of salicylaldoxime with formaldehyde and N,N′-dimethylethylenediamine. Polymer 2, a crosslinked chelating ion exchange resin, was obtained by a similar Mannich condensation in presence of resorcinol as the crosslinker. The sorption properties of these polymers towards the divalent ions, Mg2+, Ca2+, Ni2+, Zn2+, Cd2+, and Cu2+ were studied by a batch equilibration technique as a function of contact time and pH. Crosslinking is found to have profound effects on the surface morphology and the chelation properties of these polymers. The crosslinked Polymer 2 exhibited improved chelation characteristics in comparison with Polymer 1 and displayed faster rates of metal ion uptake and relatively higher capacities and selectivities. These findings are in keeping with the observed increase in hydrophilic character upon crosslinking.
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