Journal
ADVANCED MATERIALS
Volume 34, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202104606
Keywords
covalent linkages; interfacial compatibility; propylene separation; ZIF-8 membranes
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21971035]
- 111 Program [B18012]
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A covalent-linking strategy was used to enhance the interface compatibility of a ZIF-8-based membrane for propylene separation. The resulting ZIF-8-CN@tPIM-1 membrane showed significantly improved propylene permeation property and selectivity, with high C3H6 permeability.
The interface is a critical issue for metal-organic-framework hybrid membranes in propylene separation. Here, a covalent-linking strategy is reported for strikingly reinforcing the interfacial compatibility in a ZIF-8-based membrane. A functionalized ZIF-8 material named ZIF-8-CN is synthesized using the mixed-ligand approach. ZIF-8-CN has an identical crystalline structure to ZIF-8, and the 4,5-dicyanoimidazole ligand is available for further functionalization. Covalent linkage of ZIF-8-CN with PIM-1 is driven by the thermal reaction of the cyano groups on both entities, which strengthens the filler-polymer connection in the ZIF-8-CN@tPIM-1 membrane. ZIF-8-CN@tPIM-1 exhibits remarkably enhanced propylene permeation property with C3H6/C3H8 selectivity of approximate to 28, which is 350% and 180% higher than those on non-treated ZIF-8-CN/PIM-1 and non-functionalized ZIF-8@tPIM-1, respectively. Additionally, ZIF-8-CN@tPIM-1 shows the highest C3H6 permeability of approximate to 370 Barrer among all relevant ZIF-8 membranes. This strategy opens an avenue for precise interface engineering in membranes and the resultant high performance is appealing in the propylene separation industry.
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