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KMID : 1059519880320040358
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Journal of the Korean Chemical Society
1988 Volume.32 No. 4 p.358 ~ p.370
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Studies on the New Analytical Methods for Separation and Recovery of Rare Earth Metals (I) : Adsorption Characteristics of U(VI) Ion by New Synthetic Resins with Macrocyclic Compounds
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Jung Oh-Jin
Jung Hak-Jin
Kim Joon-Tae
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Abstract
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Several new ion exchange resins have been synthesized from chloromethyl styrene-1,4-divinylbenzene(DVB) with 1%, 2%, 4%, and 10%-crosslinking and macrocyclic ligands of cryptand type by interpolymerization method. The adsorption characteristics and the pH, time, solvents and concentration dependence of the adsorption of metal ions by this resin were studied. The correlation between the separation characteristics of uranium, rare earths and transition metal on the resins and the stability constants of complexes with macrocyclic ligands have been examined. The resins were very stable in both acidic and basic media and have good resistance to heat at 280℃. The UO22+ aqueous solution are not adsorbed on the resins below pH 3.0, but the power of adsorption of UO22+ increased rapidly above pH 4.0. The optimum equilibrium time for adsorption of metallic ions was twenty minutes and adsorptive power decreased in proportion to crosslinking size of the resins and order of dielectric constants of solvents used and the selective sequence for metal cations is in the order of UO22+, Cu2+ and Nd3+.
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