Poly(ionic liquid)s as phase splitting promoters in aqueous biphasic systems

Karen G. João, Liliana C. Tomé, Mehmet Isik, David Mecerreyes, Isabel Maria Marrucho Ferreira

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Aqueous biphasic systems (ABSs) provide a sustainable and efficient alternative to conventional liquid-liquid extraction techniques with volatile organic solvents, and can be used for the extraction, recovery, and purification of diverse solutes. In this work, and for the first time, ABSs composed of poly(ionic liquid)s (PILs) and inorganic salts were measured at 25 °C and atmospheric pressure. New PILs having pyrrolidinium polycations combined with different counter-anions, namely acetate [Ac]-, trifluoroacetate [TFAc]-, hexanoate [Hex]-, adipate [Adi]-, and citrate [Cit]- were synthesized, by a simple and environmentally-friendly procedure, and characterized. The effect of the PIL features, namely molecular weight and anionic character, and other experimental variables, such as temperature, on the phase splitting ability was researched. The aptitude of the studied ABS to be implemented as separation technologies was also evaluated through the use of a model biomolecule, tryptophan.

Original languageEnglish
Pages (from-to)27462-27472
Number of pages11
JournalPhysical Chemistry Chemical Physics
Issue number41
Publication statusPublished - 2015


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