Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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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

희토류금속 분리 및 회수를 위한 분석화학적 연구 (제1보) : 우라늄(VI)의 분리회수를 위한 선택이온교환수지 합성과 우라늄(VI) 금속이온의 흡착특성

  • Jung Oh Jin (Department of Chemistry, Chosun University) ;
  • Hak Jin Jung (Department of Chemistry, Chosun University) ;
  • Joon Tea Kim (Department of Chemistry, Chosun University)
  • 정오진 (조선대학교 자연과학대학 화학과) ;
  • 정학진 (조선대학교 자연과학대학 화학과) ;
  • 김준태 (조선대학교 자연과학대학 화학과)
  • Published : 1988.08.20
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Abstract

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 $280^{\circ}C$. The $UO_2^{+2}$ aqueous solution are not adsorbed on the resins below pH 3.0, but the power of adsorption of $UO_2^{2+}$ 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 $UO_2^{2+},\;Cu^{2+}\;and\;Nd^{3+}$.

클로로메칠화된 스틸렌, 1,4-디비닐벤젠과 동공의 크기를 달리한 여러가지 거대고리화합물을 개시제로 하여 공중합법에 의하여 1%, 2%, 4% 및 10%의 다리결합도를 가진 새로운 이온교환수지를 합성하였다. 그리고 이들 수지에 대한 우라늄(VI), 구리(II), 및 희토류(III) 금속에 대한 흡착특성을 검토하였다. 이 수지들은 강산, 강염기 및 열에 대해서 안정하였으며 pH 4.0이상에서는 $UO_2^{+2}$의 흡착력이 증가하였다. U(Ⅵ)금속이온의 최적흡착시간은 20분이상이였으며 금속이온흡착력은 수지의 다리결합도와 흡착시 사용한 용액의 유전상수크기에 반비례하였다. 그리고 1% 다리결합도수지의 $UO_2^{2+}$이온에 대한 겉보기 용량이 가장 크게 났으며 U(VI)금속이온은 희토류(III)금속이온에 대하여 선택성을 보였다.

Keywords

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