Continuous Flow Processing of ZIF-8 Membranes on Polymeric Porous Hollow Fiber Supports for CO₂ Capture

Abstract

We have utilized an environmentally friendly synthesis approach for the accelerated growth of a selective inorganic membrane on a polymeric hollow fiber support for postcombustion carbon capture. Specifically, continuous defect-free ZIF-8 thin films were grown and anchored using continuous flow synthesis on the outer surface of porous supports using water as solvent. These membranes demonstrated CO permeance of 22 GPU and the highest reported CO/N selectivity of 52 for a continuous flow synthesized ZIF-8 membrane.

Green Synthesis of Hierarchical Metal–Organic Framework/Wood Functional Composites with Superior Mechanical Properties

“…Integrating MOFs onto or into various substrates to produce shapeable and cost‐efficient materials constitutes one way to expand the potential applications of these functional materials. In this regard, MOFs have been deposited or grown on various polymer substrates by means of direct mixing, in situ growth, layer‐by‐layer, and continuous flow synthesis resulting in composite materials that exhibit a complex multilevel network of macropores, mesopores, and micropores, in which the macro‐ and mesoporous structures enhance the diffusion kinetics and accessibility to the active sites located in the micropores of MOFs …”

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

“…ZIFs possess the unique properties of high crystallinity, large surface area, exceptional chemical and functional tunability. As a result, ZIFs have gained considerable attention for their potential application in gas storage 2 , CO 2 capture 3,4 , separation 5,6 , sensing 7 , catalysis 8 , drug delivery 9,10 and water treatment 11,12 . Zeolitic imidazolate framework-8 (ZIF-8), with sodalite (SOD) topology constructed from Zn and Hmim, is one of the most investigated ZIF materials 13–15 .…”

A mini‐review and recent outlooks on the synthesis and applications of zeolite imidazolate framework‐8 (ZIF‐8) membranes on polymeric substrate

“…50 Another scenario is to flow both metal and ligand solutions separately, with the polymeric substrate acting as a barrier separating both solutions. [52][53][54] Differing from the first scenario, the second scenario offers more flexibility to grow the membrane on either side of the membrane, depending on the location of the metal reagent. 52,53 Various processing parameters can then affect the resulting ZIF-8 membrane formation in this scenario, such as solvent selection to dissolve the reagents, flow rate of the reagent solution, polymeric substrate porosity and heat pretreatment of polymeric substrate before membrane formation.…”