Highly hydrogen permselective ZIF-8 membranes supported on polydopamine functionalized macroporous stainless-steel-nets

Abstract

Inspired by the bio-adhesive ability of the marine mussel, highly hydrogen permselective ZIF-8 membranes were prepared on polydopamine functionalized stainless-steel-nets (SSNs). With polydopamine functionalization of SSNs under mild conditions, the nucleation and growth of well-intergrown ZIF-8 membranes were promoted through the formation of strong non-covalent and covalent bonds, which was helpful to enhance the membrane's separation selectivity while maintaining high permeance. For binary mixtures at 100 C and 1 bar, the mixture separation factors of H 2 -CO 2 , H 2 -N 2 , H 2 -CH 4 and H 2 -C 3 H 8 , were found to be 8.

An innovative approach for the preparation of confined ZIF-8 membranes by conversion of ZnO ALD layers

“…This compound is an attractive ultramicroporous material (pore limiting diameter $ 0.34 nm) [6] with exceptional thermal and chemical stability. ZIF-8 membranes have a huge potential for the extraction of H 2 from gas mixtures [7,8] and are also considered for alkene/alkane separations [9,10] either by molecular sieving mechanisms, selective adsorption or/and surface diffusion. Unfortunately the current membrane synthesis methods provide neither a sufficient reproducibility on commercial supports (tubular and multichannel), nor a competitive cost/ effectiveness ratio.…”

Polydopamine-based synthesis of a zeolite imidazolate framework ZIF-100 membrane with high H2/CO2 selectivity

“…Our recent study indicated that pre-modication of the support surface with PDA can be employed 38 as a simple and powerful strategy to improve the nucleation of MOFs and zeolites on the alumina support surface through the formation of strong covalent bonds with the MOF or zeolite crystals. [38][39][40] In the present work, therefore, we tried to prepare a dense ZIF-100 membrane on the premodied support with PDA. As shown in Fig.…”

“…[35][36][37] Recently, PDA-based synthesis of ZIF-8 and zeolite LTA membranes has been developed to improve their gas separation performance and reproducibility. [38][39][40] It can be expected, therefore, that ZIF-100 membranes prepared on PDA-functionalized supports will show higher gas separation performances and reproducibility of membrane preparation.…”

“…Yaghi and co-workers have developed a novel ZIF-100 structure with the composition Zn 20 (cbIM) 39 (OH) through the reaction of Zn(O 3 SCF 3 ) 2 with 5-chlorobenzimidazole (cbIM).…”

Facile synthesis of zeolite FAU molecular sieve membranes on bio-adhesive polydopamine modified Al2O3 tubes

“…Attributing to its adhesive ability through non-covalent adsorption and covalent reaction [42], PDA is very effective to attach precursor species onto supports for the facile synthesis of dense and selective ZIF-8 membrane [43,44] and zeolite LTA membrane [45]. In the present work, we extend and develop this concept for in-situ growth of dense zeolite FAU molecular sieve membranes on PDA-modified α-Al 2 O 3 tubes, as shown in Fig.…”