Liquid membranes using ionic liquids: the influence of water on solute transport

Raquel Fortunato, Maria Jesus González-Muñoz, Monika Kubasiewicz, Susana Luque, J. R. Alvarez, Carlos A. M. Afonso, Isabel M. Coelhoso, João G. Crespo

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


This work evaluates the use of room temperature ionic liquids (RTILs) in liquid membranes. Water possesses non-negligible solubility in room temperature ionic liquids, despite the fact that the latter may be water immiscible. This prompted us to study the potential role that water may play on the mechanism of solute transport between aqueous phases, separated by a supported liquid membrane with ionic liquids. Amino acids were chosen as case-study solutes and the role played by water in their mechanism of transport was evaluated. The assessment of the transport mechanism of amino acid derivatives, with potentially different affinities towards the RTILs is also of interest. As the liquid-liquid extraction of amino acids by RTILs is potentially lower than that of amino acid esters, given the fact that the latter are more hydrophobic due to the substitution of the acidic proton of amino acids by an alkyl group, amino acid esters were also selected for study.

Original languageEnglish
Pages (from-to)153-162
Number of pages10
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - 1 Mar 2005


  • Amino acids
  • Ionic liquids
  • Liquid membranes
  • Membrane transport
  • Water sorption and diffusion


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