Dioxouranium(VI) extraction in microchannels using ionic liquids

Dimitrios Tsaoulidis, Valentina Dore, Panagiota Angeli*, Natalia V. Plechkova, Kenneth R. Seddon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


The extraction of uranium(VI) from aqueous nitric acid solutions by tributylphosphate {TBP; 30%(v/v)} dissolved in the ionic liquid 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide was investigated. The experiments were performed in a Teflon microchannel of 0.5mm internal diameter, while the dioxouranium(VI) concentrations in the aqueous and the ionic liquid phases were determined by UV-Vis spectroscopy. The effects of initial nitric acid concentration (0.01-3M), residence time, and phase flow rate ratio were studied. It was found that, with increasing nitric acid concentration, the percentage of dioxouranium(VI) extracted decreased and then increased again, while the extraction efficiency followed a slightly different trend. Overall mass transfer coefficients varied between 0.049s-1 and 0.312s-1.

Original languageEnglish
Pages (from-to)151-157
Number of pages7
JournalChemical Engineering Journal
Issue number3
Early online date04 Sep 2012
Publication statusPublished - 01 Jul 2013

Bibliographical note

Copyright 2012 Elsevier B.V., All rights reserved.


  • Dioxouranium(VI) nitrate
  • Ionic liquids
  • Liquid-liquid extraction
  • Microchannel
  • UV-Vis spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry


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