Metal–Organic Framework/PVDF Composite Membranes with High H2 Permselectivity Synthesized by Ammoniation1. Issue 19 (24th March 2015)

• Record Type: Journal Article
• Authors: Li, Wanbin; Meng, Qin; Zhang, Congyang; Zhang, Guoliang
• Is Part Of: Chemistry. Volume 21:Issue 19(2015)
• Page Start: 7224
• Page End: 7230
• Publication Date: 2015-03-24
• Subjects: hydrogen -- membranes -- metal–organic frameworks -- nanoparticles -- polymers; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201500007
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Herein we report a new ammoniation‐based chemical modification strategy for synthesis of continuous and uniform metal–organic framework (MOF)/polyvinylidene fluoride (PVDF) membranes with attractive performance. Ammoniation can promote the support PVDF membrane to produce amino groups, form a nanoparticle structure, and be well cross‐linked; therefore, the high‐density heterogeneous nucleation sites for MOFs growth were provided and the thermal stability and chemical resistance of composite membranes can be greatly improved. The high‐quality layers of representative Cu‐BTC and ZIF‐8 were synthesized on the chemically modified PVDF membranes. By ammoniation, ZIF‐7 can even be grown under harsh synthetic conditions such as in DMF precursor solutions at 403 K. The fabricated MOF/PVDF composite membranes with excellent hollow fiber structures and enhanced structural stability exhibited high H2 permselectivities for H2 /CO2 and H2 /N2 . Abstract : PVDF‐based MOFs : Polyvinylidene fluoride (PVDF) hollow fibers were ammoniated to produce amino groups, form nanoparticle structures that are well cross‐linked, and then provide the high‐density heterogeneous nucleation sites for the growth of metal–organic frameworks (MOFs; see figure). The fabricated MOF/PVDF composite membranes exhibited high H2 permselectivities for H2 /CO2 and H2 /N2 .