Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 44, Pages 38575-38583Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12507
Keywords
ZIF-300; PEBA; mixed-matrix membranes; CO2 sorption; CO2/N-2
Funding
- National Natural Science Foundation of China [21406107, 21490585, 21301148, 21776125]
- National Key Basic Research Program [2017YFB0602500]
- Ministry of Education of China [IRT_17R54]
- Natural Science Foundation of Jiangsu Province [BK20140930]
- Topnotch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
- Innovation Project of Graduate Research by Jiangsu Province [KYLX_0764]
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Because of the high separation performance and easy preparation, mixed-matrix membranes (MMMs) consisting of metal-organic frameworks have received much attention. In this article, we report a novel ZIF-300/PEBA MMM consisting of zeolite imidazolate framework (ZIF-300) crystals and polyether block amide (PEBA) matrix. The ZIF-300 crystal size was effectively reduced by optimizing the hydrothermal reaction condition from similar to 15 to similar to 1 mu m. The morphology and physicochemical and sorption properties of the synthesized ZIF-300 crystals and as-prepared ZIF-300/PEBA MMMs were systematically studied. The results showed that ZIF-300 crystals with a size of similar to 1 mu m maintained excellent preferential CO2, sorption over N-2 without degradation of the crystal structure in the MMMs. As a result, uniformly incorporated ZIF-300 crystals highly enhanced both the CO2, permeability and the CO2/N-2 selectivity of pure PEBA membrane. The optimized ZIF-300-PEBA MMMs with a ZIF-300 loading of 30 wt % exhibited a high and stable CO, permeability of 83 Barrer and CO2/N-2 selectivity of 84, which are 59.2% and 53.5% higher than pure PEBA membrane, respectively. The obtained performance surpassed the upper bound of state-of-the-art membranes for CO2/N-2 separation. This work demonstrated that the proposed ZIF-300/PEBA MMM could be a potential candidate for an efficient CO2, capture process.
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