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    Mixed matrix membranes based on ionic liquids and porous organic polymers for selective CO2 separation

    Year: 2022

    Journal: J. Membr. Sci., Volume 660, OCT 15

    Authors: Nabais, Ana R.; Ahmed, Sadia; Younis, Muhammad; Zhou, Jin-Xiu; Pereira, Joao R.; Freitas, Filomena; Mecerreyes, David; Crespo, Joao G.; Huang, Mu-Hua; Neves, Luisa A.; Tome, Liliana C.

    Organizations: Fundacao para a Ciencia e a Tecnologia (FCT/MCTES) [SFRH/BD/136963/2018, 2020.01555.CEECIND]; Associate Laboratory for Green Chemistry - LAQV - FCT/MCTES [UIDB/50006/2020, UIDP/50006/2020]; Research Unit on Applied Molecular Biosciences-UCIBIO - FCT/MCTES [UIDP/04378/2020, UIDB/04378/2020]; Associate Laboratory Institute for Health and Bioeconomy-i4HB - FCT/MCTES [LA/P/0140/2020]; National Natural Science Foundation of China [21772013]; Beijing Natural Science Foundation [2202049]

    Keywords: Iongel; Porous organic polymers; Ionic liquids; Gas separation

    The development of more efficient materials is a crucial step in the development of gas separation membranes. In this work, we combine ionic liquids (ILs) and porous organic polymers (POPs) for the first time to fabricate a new type of mixed matrix iongel membranes, which are entirely composed of organic materials. The new azo-POPs reported in this work were specifically designed due to their CO2-philic feature to be incorporated in iongel materials. The membranes, comprising 80 wt% of [C2mim][TFSI] IL and 20 wt% of poly(ethylene glycol) diacrylate (PEGDA) network, were prepared using a solvent-free UV curing method. The unique properties of azoPOPs within the iongel material resulted in the fabrication of dense and defect-free membranes with improved gas separation performances, in terms of both CO2 permeability (62.3-90.6 barrer) and, CO2/CH4 (9.9-12.0), CO2/H2 (6.0-12.1) and CO2/N2 (16.8-53.1) ideal selectivities, with the latter revealing to be highly dependent on the morphological properties of the azo-POPs. Furthermore, iongel characterization in terms of morphology, chemical structure and thermal properties, confirmed the potential of the novel mixed matrix iongels for CO2 separation processes.
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