Covalent‐Linking‐Enabled Superior Compatibility of ZIF‐8 Hybrid Membrane for Efficient Propylene Separation. Issue 6 (16th December 2021)

• Record Type: Journal Article
• Authors: Wang, Ziyang; Wang, Wenjian; Zeng, Tao; Ma, Dan; Zhang, Panpan; Zhao, Siqi; Yang, Li; Zou, Xiaoqin; Zhu, Guangshan
• Is Part Of: Advanced materials. Volume 34:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-16
• Subjects: covalent linkages -- interfacial compatibility -- propylene separation -- ZIF‐8 membranes; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202104606
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: 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 C3 H6 /C3 H8 selectivity of ≈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 C3 H6 permeability of ≈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. Abstract : Superior interfacial compatibility in metal–organic framework (MOF) hybrid membranes is achieved by linking functionalized ZIF‐8 and polymeric PIM‐1 through chemical bonds. The fabricated membrane exhibits the highest C3 H6 permeability and remarkable selectivity for C3 H6 over C3 H8 among ZIF analogs, potentially for efficient propylene separation.