Advertisement

Journal of Radioanalytical and Nuclear Chemistry

, Volume 262, Issue 2, pp 455–459 | Cite as

Thermodynamics of the solvent extraction of thorium and europium nitrates by neutral phosphorylated ligands

  • M. R. Yaftian
  • R. Taheri
  • A. A. Zamani
  • D. Matt
Article

Abstract

Solvent extraction of tetravalent thorium and trivalent europium ions from nitrate media into dichloromethane solution of triphenylphosphine oxide (TPPO) has been studied. The extractant was shown to be more efficient for europium than for thorium. A conventional log-log analysis reveals that the extraction of both metal nitrates takes place via the formation of the species with 1 : 2 metal to ligand ratio. Thermodynamic parameters i.e., ΔG°, ΔH° and ΔS° of the extraction process using 1,2-dichloroethane as diluent have been calculated based on the influence of the temperature on extraction equilibria in the range 293-313 K. While the extraction of europium is controlled by enthalpy changes, the extraction of thorium is an endothermic process and is driven by entropy changes. A comparison of these data with those obtained for the extraction of europium and thorium nitrates by two other related phosphorylated ligands, tri-n-octylphosphine oxide (TOPO) and diphenyl-N,N-dimethylcarbamoylmethylphosphine oxide (DФDMCMPO), indicates that DФDMCMPO coordinates presumably as a chelating ligand.

Keywords

Thorium Phosphine Oxide TPPO Nitrate Medium Triphenylphosphine Oxide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    B. Weaver, Solvent Extraction in the Separation of Rare Earths and Trivalent Actinides, in Ion Exchange and Solvent Extraction, Vol. 6, J. A. Marinsky and Y. Marcus (Eds), Marcel Dekker, New York, 1974.Google Scholar
  2. 2.
    E. P. Horwitz, R. Chiarizia, in: Separation Techniques in Nuclear Waste Management, N. A. Chipmenand C. M. Wai (Eds), CRC, FL, 1996.Google Scholar
  3. 3.
    W. W. Schulz, L. L. Burger, J. D. Navratil (Eds), Science and Technology of Tributylphosphate, Vols I-III, CRC, Boca Raton, FL., 1984-1990.Google Scholar
  4. 4.
    E. P. Horwitz, D. G. Kalina, A. C. Muscatello, Separ. Sci. Technol., 16 (1981) 403.Google Scholar
  5. 5.
    E. P. Horwitz, D. G. Kalina, L. Kaplan, G. W. Mason, H. Diamond, Separ. Sci. Technol., 17 (1982) 1261.Google Scholar
  6. 6.
    E. P. Horwitz, K. A. Martin, H. Diamond, L. Kaplan, Solvent Extr. Ion Exch., 4 (1986) 449Google Scholar
  7. 7.
    E. P. Horwitz, D. G. Kalina, H. Diamond, G. F. Vandegrift, Solvent Extr. Ion Exch., 3 (1985) 75.Google Scholar
  8. 8.
    D. G. Kalina, Solvent Extr. Ion Exch., 2 (1984) 381.Google Scholar
  9. 9.
    T. Nakamura, C. Miyake, Solvent Extr. Ion Exch., 12 (1994) 931.Google Scholar
  10. 10.
    T. Takeuchi, S. Tanaka, M. Yamawaki, Solvent Extr. Ion Exch., 12 (1994) 987.Google Scholar
  11. 11.
    M. W. Peters, E. J. Werner, M. J. Scott, J. Inorg. Chem., 41 (2002) 1707.CrossRefGoogle Scholar
  12. 12.
    M. R. Yaftian, M. Burgard, C. Wieser, C. B. Dieleman, Solvent Extr. Ion Exch., 16 (1998) 1131.Google Scholar
  13. 13.
    M. R. Yaftian, L. Hassanzadeh, M. E. Eshraghi, D. Matt, Separ. Pur. Tech., 31 (2003) 261.CrossRefGoogle Scholar
  14. 14.
    M. R. Yaftian, M. E. Eshraghi, L. Hassanzadeh, Iran. Chem. Chem. Eng., 22 (2003) 71.Google Scholar
  15. 15.
    Z. Marczenko, Spectrophotometric Determination of Elements, Wiley, New York, 1976.Google Scholar
  16. 16.
    F. Arnaud-Neu, V. Böhmer, J.-F. Dozol, C. Grüttner, R. A. Jakobi, D. Kraft, O. Mauprivez, H. Roquette, M.-J. Schwing-Weill, N. Simon, W. Vogt, J. Chem. Soc., Perkin Trans. II, (1996) 1175.Google Scholar
  17. 17.
    M. R. Yaftian, R. Taheri, D. Matt, Phosphorus, Sulfur, Silicon, 178 (2003) 1225.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publisher/Akadémiai Kiadó 2004

Authors and Affiliations

  • M. R. Yaftian
    • 1
  • R. Taheri
    • 1
  • A. A. Zamani
    • 1
  • D. Matt
    • 2
  1. 1.Department of Chemistry, Faculty of SciencesZanjan UniversityZanjanIran E-mail
  2. 2.Laboratoire de Chimie Inorganique Moléculaire, UMR 7513 CNRSUniversité Louis PasteurStrasbourgFrance

Personalised recommendations