The effect of 3-dimensionally disordered mesoporous silica (DMS) was investigated on the transport of two different glassy polymer matrices, 6FDA-DAM:DABA (3:2) and polysulfone (PSf). More specifically, single gas (i.e. N2, CO2, CH4 and NF3) permeabilities of the mixed matrix membranes (MMMs) were characterized as a function of DMS volume fractions. Our permeation results demonstrated that both 6FDA-DAM:DABA (3:2)- and PSf-based MMMs with a nominal DMS weight fraction of 0.2 substantially improved all the single gas permeabilities mainly due to the diffusivity improvement. Such a significant increase in diffusivity is attributed to the 3-dimensionally interconnected pore structures of DMS particles. NF3, a missing greenhouse gas, exhibited the permeability improvement mechanism different from other gases. Besides, at the relatively lower DMS loading, difference in the extent of increase in permeability was observed for two different polymer cases. It was explained presumably by the effect of a high resistance zone-of-influence, or the rigidification of matrix polymer chains around inorganic particles. Our study suggests that 3-dimensional DMS particle-containing MMMs can provide a useful material platform for separating N2/NF3, CO2/CH4, and CO2/N2, by substantially increasing permeability, thereby cutting down the capital cost of membrane units.
Bibliographical noteFunding Information:
This work was supported by the KIST Institutional Programs (Project No. 2E23952 ), the Global Excellent Technology Innovation of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20135010100750 ) under the Ministry of Trade, Industry & Energy and by Energy Efficiency and Resources R&D Program ( 2012T100100528 ) under the Ministry of Knowledge Economy, Republic of Korea. We appreciate UNI-AM CO., LTD for their kind supply of DMS particles. Also, we appreciate Prof. Ryan P. Lively and Prof. William J. Koros for the personal communication.
© 2014 Elsevier B.V. All rights reserved.
- 3-D disordered mesoporous silica
- Greenhouse gas separations
- Mixed matrix membranes
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation