Carbon dioxide capture by aqueous ionic liquid solutions

Jairton Dupont, Nathalia M. Simon, Marcileia Zanatta, Francisco P. Dos Santos, Marta C. Corvo, Eurico J. Cabrita

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Confined water in aqueous solutions of imidazolium-based ionic liquids (ILs) associated with acetate and imidazolate anions react reversibly with CO2 to yield bicarbonate. Three types of CO2 sorption in these "IL aqueous solutions" were observed: physical, CO2-imidazolium adduct generation, and bicarbonate formation (up to 1.9mol(bicarbonate) mol(-1) of IL), resulting in a 10:1 (molar ratio) total absorption of CO2 relative to imidazolate anions in the presence of water 1:1000 (IL/water). These sorption values are higher than the classical alkanol amines or even alkaline aqueous solutions under similar experimental conditions.
Original languageEnglish
Pages (from-to)4927-4933
Number of pages7
Issue number24
Publication statusPublished - 22 Dec 2017


  • bicarbonate species
  • carbon dioxide capture
  • confined water
  • ionic liquids
  • nuclear magnetic resonance


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