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Extraction of uranium(VI) from nitric acid medium by 1.1M tri-n-butylphosphate in ionic liquid diluent

  • P. Giridhar
  • K. A. Venkatesan
  • T. G. Srinivasan
  • P. R. Vasudeva Rao
Article

Summary

A systematic study on the extraction of U(VI) from nitric acid medium by tri-n-butylphosphate (TBP) dissolved in a non-traditional diluent namely 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6) ionic liquid (IL) is reported. The results are compared with those obtained using TBP/n-dodecane (DD). The distribution ratio for the extraction of U(VI) from nitric acid by 1.1M TBP/bmimPF6 increases with increasing nitric acid concentration. The U(VI) distribution ratios are comparable in the nitric acid concentration range of 0.01M to 4M, to the ratios measured using 1.1M TBP/DD. In contrast to the extraction behavior of TBP/DD, the D values continued to increase with the increase in the concentration of nitric acid above 4.0M. The stoichiometry of uranyl solvate extracted by 1.1M TBP/IL is similar to that of TBP/DD system, wherein two molecules of TBP are associated with one molecule of uranyl nitrate in the organic phase. Ionic liquid alone also extracts uranium from nitric acid, albeit to a small extent. The exothermic enthalpy accompanying the extraction of U(VI) in TBP/bmimPF6 decreases with increasing nitric acid and with TBP concentrations.

Keywords

Uranium Nitric Acid Ionic Liquid Distribution Ratio Hexafluorophosphate 
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.

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • P. Giridhar
    • 1
  • K. A. Venkatesan
    • 2
  • T. G. Srinivasan
    • 3
  • P. R. Vasudeva Rao
    • 4
  1. 1.Fuel Chemistry Division, Chemical Group, Indira Gandhi Centre for Atomic Research
  2. 2.Fuel Chemistry Division, Chemical Group, Indira Gandhi Centre for Atomic Research
  3. 3.Fuel Chemistry Division, Chemical Group, Indira Gandhi Centre for Atomic Research
  4. 4.Fuel Chemistry Division, Chemical Group, Indira Gandhi Centre for Atomic Research

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