CO2-Philic [EMIM][Tf2N] modified silica in mixed matrix membrane for high performance CO2/CH4 separation

Siti Nur Alwani, Shafie and Wen, Xuan Liew and Nik Abdul Hadi, Md Nordin and Bilad, Muhammad Roil and Norazlianie, Sazali and Zulfan, Adi Putra and Mohd Dzul Hakim, Wirzal (2019) CO2-Philic [EMIM][Tf2N] modified silica in mixed matrix membrane for high performance CO2/CH4 separation. Advances in Polymer Technology, 2019 (2924961). pp. 1-10. ISSN 1098-2329. (Published)

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Separation of carbon dioxide (CO 2 ) from methane (CH 4 ) using polymeric membranes is limited by trade-off between permeability and selectivity as depicted in Robeson curve. To overcome this challenge, this study develops membranes by incorporating silica particles (Si) modified with [EMIM][Tf 2 N] ionic liquid (IL) at different IL:Si ratio to achieve desirable membrane properties and gas separation performance. Results show that the IL:Si particle has been successfully prepared, indicated by the presence of fluorine and nitrogen elements, as observed via Fourier-Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectrometer (XPS). Incorporation of the modified particles into membrane has given prominent effects on morphology and polymer chain flexibility. The mixed matrix membrane (MMM) cross-section morphology turns rougher in the presence of IL:Si during fracture due to higher loadings of silica particles and IL. Furthermore, the MMM becomes more flexible with IL presence due to IL-induced plasticization, independent of IL:Si ratio. The MMM with low IL content possesses CO 2 permeance of 34.60 ± 0.26 GPU with CO 2 /CH 4 selectivity of 85.10, which is far superior to a pure polycarbonate (PC) and PC-Sil membranes at 2 bar, which surpasses the Robeson Upper Bound. This higher CO 2 selectivity is due to the presences of CO 2 -philic IL within the MMM system.

Item Type: Article
Subjects: Q Science > QD Chemistry
Faculty/Division: Centre of Excellence: Centre of Excellence for Advanced Research in Fluid Flow
Faculty of Mechanical Engineering
Depositing User: Dr. Norazlianie Sazali
Date Deposited: 07 Aug 2019 06:12
Last Modified: 07 Aug 2019 06:12
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