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Adsorption of Uranium (VI) Ion on the 1-Aza-12-Crown-4-Styrene-DVB Synthetic Resin Adsorbent  

Kim, Joon-Tae (Department of Chemistry, Chosun University)
Publication Information
Applied Chemistry for Engineering / v.19, no.3, 2008 , pp. 304-309 More about this Journal
Abstract
Cryptand series ion exchange resins were synthesized with 1-aza-12-crown-4 macrocyclic ligand attached to styrene (4 series dangerous matter) divinylbenzene (DVB) copolymer with crosslink of 1％, 2％, 4％ and 8％ by a substitution reaction. The synthesis of these resins was confirmed by content of chlorine, element analysis, electron micrograph, and IR-spectrum. The effects of pH, time, dielectric constant of solvent and crosslink on adsorption of uranium (${UO_2}^{2+}$) ion were investigated. The uranium ion showed a fast adsorption on the resins above pH 3. The optimum equilibrium time for adsorption of metallic ions was about two hours. The adsorption selectivity determined in ethanol was in increasing order uranium (${UO_2}^{2+}$) > nickel ($Ni^{2+}$) > gadolinium ($Gd^{3+}$) ion. The adsorption was in order of 1％, 2％, 4％, and 8％ crosslinked resin and adsorption of resin decreased in proportion to order of dielectric constant of solvents.
Keywords
cryptand; 1-aza-12-crown-4; crosslink; styrene; macrocyclic ligand;
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