All Issue

2011 Vol.48, Issue 4 Preview Page
31 August 2011. pp. 473-482
Abstract
For the concentration of uranium, anion exchange resin was synthesized using tetramethylammonium hydroxide pentahydrate (THP) and the adsorption/desorption efficiencies were compared with commercial Lewatit K6462. Uranium adsorption tests in 100 ml UO2(SO4)22- solution (21 ppm) with 0.26 g of ion exchange resins resulted in high adsorption efficiency of 93.8% with the synthetic resin whereas 98.9% with the commercial one at room temperature. Adsorption efficiencies were maintained up to 50℃ for the commercial resin whereas they were maintained up to 60℃ for the synthetic one. When the synthetic resin was added with nano-clay, Cloisite 93A, the gap between organized nano-clay became distant and clay particles are more dispersed. In this respect, the synthetic resin became thermally stabilized and the adsorption efficiencies were maintained up to 75℃. Although adsorption efficiencies with commercial and synthetic resin were very low (2%) under acidic conditions, they increased up to 96.2% and 97.5% respectively as pH reached to 12. This was thought to be due to the strong basic property of the quaternary ammonium functional group in resins. On the other hand, desorption efficiencies increased under strong acidic condition. Eventually, the synthetic resin gave 4.8% higher desorption efficiency than the case of commercial one in 3 mol/L HNO3 solution.
희박 우라늄의 농축을 위하여, tetramethylammonium hydroxide pentahydrate(THP)를 이용한 이온교환 수지를 합성하고, 우라늄 흡탈착능을 상용수지 Lewatit K6462와 비교하였다. 상온에서 100 ml의 UO2(SO4)22- 21 ppm 용액에 상용수지를 0.26 g 첨가시 최대 98.9%, 합성수지는 0.26 g 첨가시 최대 93.8%의 흡착능을 보였다. 한편 상용수지는 50℃, 합성수지는 60℃까지 흡착능을 유지하나, 나노클레이 Cloisite 93A를 첨가한 합성수지는 합성수지내 유기화된 클레이의 층간 거리가 확대되면서 수지내 분산성 증가로 인한 내열성 향상으로 75℃까지 흡착능을 유지하였다. 산성 분위기에서 상용 및 합성수지는 우라늄용액을 2%이상 흡착시키지 못하나 염기성증가에 따라 흡착능이 증가하여 pH 12의 상태에서는 각각 96.2%, 97.5%이상 흡착능을 보였다. 이러한 현상은 합성수지와 상용수지 모두 염기도가 강한 4급 암모늄을 기능기로 갖기 때문이라 사료된다. 또한 합성 및 상용수지 모두 약산보다는 강산에서 훨씬 높은 탈착율을 보이며, HNO3 3 mol/L 용액에서는 합성수지의 경우 상용수지보다 4.8% 높은 탈착율을 보였다.
References
  1. 국립환경연구원, 1999, “지하수 중 방사성물질 함유실태에 관한 조사연구,” 한국자원연구소 p. 338.
  2. Amaral, J. C.B.S. and Morais, C.A., 2010, “Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction,” Minerals Engineering, Vol. 23, pp. 498-503.
  3. Bazzicalupi, C., Bianchi, A., Berni ,E., Calabi, L., Giorgi, C., Mariani, P., Losi, P. and Valtancoli, B., 2002, “Complexation properties of a new macrocyclic polyaminic ligand (L) containing amidic pendant arms: crystal structure of [PbL] (ClO4)2,” Inorganica Chimica Acta, Vol. 329, pp. 93-99.
  4. Cheon, J.M., Jeong, B.Y., Yoo, J.S., Park, D.J., Bae, J.K. and Chun, J.H., 2007, “Synthesis and Characterization of Waterborne Polyurethane Using Nanoclay,” J. of Adhesion and Interface, Vol. 8, No. 4, pp. 1-7.
  5. Dicer tech info, 2004, “이온성 물질의 제거를 위한 이온교 환수지의 특성 및 종류,” DICER Techinfo Part 2, Vol. 3, No. 12, pp. 609-616.
  6. Egorov., V.V., Rakhmanko., E.M., Okaev., E.B., Pomelenok., E.V. and Nazarov., V.A., 2004, “Effects of ion association of lipophilic quaternary ammonium salts in ion-exchange and potentiometric selectivity,” Talanta, Vol. 63, pp. 119-130.
  7. Han, C., Kim, J.S., Lee, J.Y., Park, K.M., Bae, J.S. and Park, J.W., 2008, “다성분계 희토류 원소의 추출분리를 위한 수지의 합성방법(Synthesis Method of Extraction Resin for Separaton of Rare Earth Elements),” 출원번호: 10-2008-0019512, 공개번호 : 10-2009-0094528.
  8. Her, K.Y., Lim, S.H. and Kim, D.H., 2009, “Influence of Ultrasonic Treatment and Nano-Clay contect on the Properties of Nano-Clay/Polyurethane Foam,” Korean Chem. Eng. Res., Vol. 47, No. 2, pp. 208-212.
  9. Kim, J.T., Kim, H.J. and Kim, K.C., 2008, “Adsorption of U(IV), Pb(II), and Ce(III) Metal Ions on Cryptand Ion Exchang Resin,” J. Korea Society of Environmental Administration, Vol. 14, No. 2, pp. 63-72.  
  10. Lama, O.P., Heinemanna, F.W. and Meyer, K., 2010, “A new diamantane functionalized tris (aryloxide) ligand system for small ecule activation chemistry at reactive uranium complexes,” Comptes Rendus Chimie, Vol. 13, pp. 803-811.
  11. Marino G. Pieterse-Editor, 2008.10., “European uranium forum,” Uraniumletter International, http://www.goldletterint.com.
  12. Park, J.S., Cho, J.W., Kim, D.H. and Han, C., 2004, “Synthesis of Extraction Resin Containing Bis(2-Ethylhexyl)phosphnic Acid and Seperation of Heavy Rare Earth Elements (Gd, Tb),” J. of The Korean Society for Geosystem Engineering, Vol. 41, No. 1, pp. 69-76.
  13. Sadeghi, S. and Doostia, S., 2008, “Novel PVC membrane bulk optical sensor for determination of uranyl ion,” Sensors and Actuators B: Chemical, Vol. 135, pp. 139-144.
  14. Singh, D.P., Shishodia, N., Yadav, B.P. and Rana, V.B., 1997, “Synthesis and characterization of bivalent metal complexes of a tetradentate N6 macrocyclic ligand,” Polyhedron, Vol. 16, pp. 2229-2232.
  15. Srncik, M., Kogelnig, D., Stojanovic, A., Körner, W., Krachler, R. and Wallner, G., 2009, “Uranium extraction from aqueous solutions by ionic liquids,” Applied Radiation and Isotopes, Vol. 67, pp. 2146-2149.
  16. Suh, M.Y., Eom, T.Y., Suh, I.S. and Kim, S.J., 1987, “Chromatographic Behavior of Cryptand[2,2] Modified Resin on Metal Cations,” Bull. Korean Chem. Soc., Vol. 8, No. 5. pp. 336-372.
  17. Zeng. Q.H., Yu. A.B., (Max) Lu. G.Q. and Paul. D.R., 2005, “Clay-Based Polymer Nanocomposites: Research and Commercial Development,” J. Nanoscience and Nanotechnology, Vol. 5, pp. 1574-1592.
Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society for Geosystem Engineering
  • Journal Title(Ko) :한국지구시스템공학회지
  • Volume : 48
  • No :4
  • Pages :473-482