Encapsulated Amino Acid-Based Ionic Liquid for CO2 Separation Membranes

Liliana P. Silva, Eyad Qasem, Lakshmeesha Upadhyaya, Rebecca Esposito, Radosław Górecki, João A.P. Coutinho, Pedro J. Carvalho*, Suzana P. Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Membrane technology has been valuable for the transition to a fully sustainable economy. We demonstrate the application of amino-acid-based ionic liquids integrated into polymeric membranes for the preferential transport of carbon dioxide (CO2). This material has a high absorption capacity for CO2, increasing its solubility in the membrane and, consequently, permeability. The amino-acid-based ionic liquid is encapsulated in porous carbon capsules to avoid leaching out during the membrane operation. The selective layer polymer matrix was constituted by Pebax1657. The addition of 1 wt % of encapsulated amino-acid-base ionic liquid led to a more than 2-fold permeability enhancement while maintaining the ideal selectivity for CO2 over other light gases. The permeability was even higher when tested with humid mixed gases without compromising the selectivity.

Original languageEnglish (US)
Pages (from-to)300-309
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Issue number1
StatePublished - Jan 8 2024

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society


  • amino-acid-based ionic liquids
  • carbon capsules
  • carbon dioxide separation
  • composite membranes
  • Pebax1657

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Renewable Energy, Sustainability and the Environment


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