합성수지를 이용한 U(VI), NiI(II), Nd(III) 금속이온들의 흡착에 관한 연구

A Study on the Adsorption of U(VI), NiI(II), Nd(III) Metal Ions Using Synthetic Resin

클로로메틸화된 스틸렌, 1,4-디비닐벤젠과 동공의 크기를 달리한 여러 가지 거대고리 화합물을 개시제로 하여 공중합법에 의하여 1%, 2%, 10% 및 20%의 가교도를 가진 새로운 이온 교환수지를 합성하였다. 그리고 이들 수지에 대한 우라늄(VI), 니켈(II) 및 네오듐(III) 금속에 대한 흡착특성을 검토하였다. 이 수지들은 강산, 강염기 및 열에 대해서 안정하였으며, pH 4.0 이상에서는 $UO_2^{2+}$ 이온에 대한 겉보기용량이 가장 크게 나타났고, 합성수지들은 네오듐(III) 금속이온에 대하여 선택성을 보였다.

Several new ion exchange resins have been synthesized from chloromethyl styrene-l,4-divinylbenzine with 1%, 2%, 10% and 20%-crosslink 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 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. The $UO_2^{2+}$ was 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 two hours and adsorptive power decreased in proportion to crosslink size of the resins and order of dielectric constants of solvents used and the selective sequence for metal cations was in the order of $UO_2^{2+}$, $Ni{2+}$ and $Nd{3+}$.