METAL-ION BINDING-PROPERTIES OF SYNTHETIC VINYL RESINS

The synthesis of a water-insoluble chelating resin was carried out by radical copolymerization of 4-vinylpyridine and N-hydroxymethyl acryla mide with subsequent crosslinking. Both the crosslinked reference homo polymers of 4-vinylpridine and N-hydroxymethyl acrylamide were also sy nthesized. The resins were characterized by elemental analyses and FT- IR spectroscopy. The ability of these resins to bind copper(II), iron( II), iron(III) and uranyl ions as well as the elution of the metal ion s from the loaded resins were studied. For uranyl ions, pH 1 was the o ptimum sorption pH value for all the resins. Sorption selectivity from the binary mixture Cu(II) + U(VI) was studied at the optimum sorption pH value. Finally, the uranium(VI) sorption isotherms, binding consta nts, and DELTAG-degree, DELTAH-degree and DELTAS-degree corresponding to the uranium(VI) sorption process were calculated.