In-situ formation of asymmetric thin-film, mixed-matrix membranes with ZIF-8 in dual-functional imidazole-based comb copolymer for high-performance CO2 capture
- Authors
- Lee, Chang Soo; Kang, Miso; Kim, Ki Chul; Kim, Jong Hak
- Issue Date
- Feb-2022
- Publisher
- ELSEVIER
- Keywords
- Carbon dioxide; Comb copolymer; Molecular dynamic simulation; Mixed-matrix membranes; Thin film
- Citation
- JOURNAL OF MEMBRANE SCIENCE, v.642
- Journal Title
- JOURNAL OF MEMBRANE SCIENCE
- Volume
- 642
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21040
- DOI
- 10.1016/j.memsci.2021.119913
- ISSN
- 0376-7388
- Abstract
- Despite numerous studies on free-standing, mixed-matrix membranes (MMMs), the development of thin-film MMMs with high permeance is still an ongoing challenge. Here, the successful fabrication of ultra-highpermeance thin-film MMMs on a porous polymer substrate is described based on a highly porous zeolitic imidazole framework (ZIF-8) and a dual-functional imidazole-based comb copolymer. The copolymer of poly (vinyl imidazole)-poly(oxyethylene methacrylate) (PVI-POEM) is synthesized via free-radical polymerization, and it exhibits CO2-philicity, strong adhesion, and good interactions with fillers. In contrast to commercial benchmark membranes such as Pebax, the use of the PVI-POEM comb copolymer results in significant improvement in the CO2 permeance without significant loss of selectivity even at high ZIF-8 loadings and low thickness. It is attributed to the in-situ formation of inverse, asymmetric morphology of MMMs and partial infiltration of PVI-POEM chains into ZIF-8 particles. Optimization of the preparation process, such as ZIF-8 loading, substrate type, and coating layer thickness, leads to an extremely high CO2 permeance of 4474 GPU with high CO2/N-2 and CO2/CH4 ideal selectivities of 32.0 and 12.4, respectively, which is far beyond the current trade-off limit for membranes. The mechanism behind the exceptionally high CO2 separation performance is delineated by exploring molecular dynamic simulation through morphology, structural, and energetic analyses.
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