Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation
This study aims at developing a novel freestanding conjugated triazine-based membrane (ETM-1) with permanent porosity via a low-temperature superacid-promoted polymerization reaction. In this venue, we used the bifunctional 4-ethynylbenzonitrile (4-EBN) monomer featuring ethynyl (C≡CH) and nitrile (...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | Chemical Engineering Journal Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821122000758 |
| _version_ | 1818535858976849920 |
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| author | Sina Pourebrahimi Majid Pirooz |
| author_facet | Sina Pourebrahimi Majid Pirooz |
| author_sort | Sina Pourebrahimi |
| collection | DOAJ |
| description | This study aims at developing a novel freestanding conjugated triazine-based membrane (ETM-1) with permanent porosity via a low-temperature superacid-promoted polymerization reaction. In this venue, we used the bifunctional 4-ethynylbenzonitrile (4-EBN) monomer featuring ethynyl (C≡CH) and nitrile (C≡N) functionalities. At the same time, trifluoromethanesulfonic acid (CF3SO3H) served as both the catalyst and solvent. The cross-linked Polymer's physicochemical properties were systematically examined using TGA, BET, solid-state 13C CP-MAS NMR, ATR-FT-IR, and XPS spectroscopy techniques. With conjugated s-triazine (as a result of cyclotrimerization of nitrile) and CCH (as a result of cationic polymerization of ethynyl), the microporous ETM-1 membrane displayed a superior CO2 uptake capacity of up to 3.87 mmol g−1 (170.3 mg g−1) and enhanced ideal CO2/N2 and CO2/CH4 permselectivity values of 47 ± 2 and 21 ± 1 at 298 K and 1 bar, respectively. The notable selectivity of ETM-1 towards CO2 can be stated in terms of the molecular sieving (i.e., kinetic selection) characteristic of the microporous membrane, its electron-rich π-conjugated skeleton, and enhanced basicity, suitable for interacting with CO2 via dipole-quadrupole and acid-base interactions. Moreover, ETM-1 exhibited the isosteric heat of CO2 adsorption ranging from 28.1 to 34.3 kJ mol−1, implying strong physisorption of CO2 upon the high-affinity adsorption sites of the membrane. |
| first_indexed | 2024-12-11T18:30:32Z |
| format | Article |
| id | doaj.art-6616aa0be96c4212b53c3fa6c80d69ea |
| institution | Directory Open Access Journal |
| issn | 2666-8211 |
| language | English |
| last_indexed | 2024-12-11T18:30:32Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj.art-6616aa0be96c4212b53c3fa6c80d69ea2022-12-22T00:54:56ZengElsevierChemical Engineering Journal Advances2666-82112022-08-0111100315Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separationSina Pourebrahimi0Majid Pirooz1Centre for Research in Molecular Modeling (CERMM) and Department of Chemical and Materials Engineering, Concordia University, 7141 Sherbrooke Street West, Montréal, QC, H4B 1R6, Canada; Corresponding author.Research and Development Division, Pad Jam Polymer Development Company (PJPC) and Department of Chemical Engineering, University of Isfahan, Isfahan, Islamic Republic of IranThis study aims at developing a novel freestanding conjugated triazine-based membrane (ETM-1) with permanent porosity via a low-temperature superacid-promoted polymerization reaction. In this venue, we used the bifunctional 4-ethynylbenzonitrile (4-EBN) monomer featuring ethynyl (C≡CH) and nitrile (C≡N) functionalities. At the same time, trifluoromethanesulfonic acid (CF3SO3H) served as both the catalyst and solvent. The cross-linked Polymer's physicochemical properties were systematically examined using TGA, BET, solid-state 13C CP-MAS NMR, ATR-FT-IR, and XPS spectroscopy techniques. With conjugated s-triazine (as a result of cyclotrimerization of nitrile) and CCH (as a result of cationic polymerization of ethynyl), the microporous ETM-1 membrane displayed a superior CO2 uptake capacity of up to 3.87 mmol g−1 (170.3 mg g−1) and enhanced ideal CO2/N2 and CO2/CH4 permselectivity values of 47 ± 2 and 21 ± 1 at 298 K and 1 bar, respectively. The notable selectivity of ETM-1 towards CO2 can be stated in terms of the molecular sieving (i.e., kinetic selection) characteristic of the microporous membrane, its electron-rich π-conjugated skeleton, and enhanced basicity, suitable for interacting with CO2 via dipole-quadrupole and acid-base interactions. Moreover, ETM-1 exhibited the isosteric heat of CO2 adsorption ranging from 28.1 to 34.3 kJ mol−1, implying strong physisorption of CO2 upon the high-affinity adsorption sites of the membrane.http://www.sciencedirect.com/science/article/pii/S2666821122000758CO2 captureGas separationPermeabilitySelectivityFreestanding membraneCovalent triazine frameworks |
| spellingShingle | Sina Pourebrahimi Majid Pirooz Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation Chemical Engineering Journal Advances CO2 capture Gas separation Permeability Selectivity Freestanding membrane Covalent triazine frameworks |
| title | Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation |
| title_full | Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation |
| title_fullStr | Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation |
| title_full_unstemmed | Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation |
| title_short | Synthesis of a novel freestanding conjugated triazine-based microporous membrane through superacid-catalyzed polymerization for superior CO2 separation |
| title_sort | synthesis of a novel freestanding conjugated triazine based microporous membrane through superacid catalyzed polymerization for superior co2 separation |
| topic | CO2 capture Gas separation Permeability Selectivity Freestanding membrane Covalent triazine frameworks |
| url | http://www.sciencedirect.com/science/article/pii/S2666821122000758 |
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