Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 658, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2022.120712
Keywords
Mixed matrix membranes (MMMs); Metal organic framework (MOF); Ionic liquid (IL); IL; CuBTC composite; CO2 separation
Categories
Funding
- European Research Council under the European Union [756489]
- Koc University TUPRAS Energy Center (KUTEM)
- Koc University Surface Science and Technology Center (KUYTAM)
- European Research Council (ERC) [756489] Funding Source: European Research Council (ERC)
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In this study, a novel IL/MOF/polymer mixed matrix membrane was synthesized and characterized. The results showed that the composite membrane significantly improved the CO2 permeability and CO2/N2 selectivity of the polymer. Among them, the membrane with a 15% IL/MOF filler loading exhibited the highest CO2/N2 selectivity.
In this work, we synthesized an ionic liquid (IL)/metal organic framework (MOF) composite, 1-ethyl-3-methylimidazolium acetate/copper-1,3,5-benzenetricarboxylate ([EMIM][OAc]/CuBTC) and used it as a filler in a polymer, Pebax, to fabricate novel IL/MOF/polymer mixed matrix membranes (MMMs). CuBTC/Pebax and [EMIM][OAc]/CuBTC/Pebax MMMs having different filler loadings of 10, 15, and 20 wt.% were prepared by solution casting method and characterized using various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), and thermogravimetric analysis (TGA). Uniform dispersion of MOF and IL/MOF fillers in the MMMs was observed. Incorporation of IL/MOF composite into Pebax significantly improved CO2 permeability and CO2/N2 selectivity of the polymer by 2.5- and 5.5-times, respectively. Gas permeability measurements showed that the MMM having 15 wt.% IL/MOF loading exhibits significantly higher CO2 permeability of 335 Barrer and CO2/N2 selectivity of 176 than the Pebax membrane having CO2 permeability of 135 Barrer and CO2/N2 selectivity of 32. CO2/N2 selectivity of the [EMIM][OAc]/CuBTC/ Pebax MMM with 15 wt.% [EMIM][OAc]/CuBTC filler loading was the highest among the selectivity values reported for other types of IL/MOF/polymer MMMs in the literature. All the CuBTC/Pebax MMMs and [EMIM] [OAc]/CuBTC/Pebax MMMs that we fabricated in this work exceeded the Robeson's updated upper bound, showing the excellent potential of these novel membranes for CO2/N2 separation.
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