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Ultrathin metal-organic framework membrane production by gel-vapour deposition.


ABSTRACT: Ultrathin, molecular sieving membranes composed of microporous materials offer great potential to realize high permeances and selectivities in separation applications, but strategies for their production have remained a challenge. Here we show a route for the scalable production of nanometre-thick metal-organic framework (MOF) molecular sieving membranes, specifically via gel-vapour deposition, which combines sol-gel coating with vapour deposition for solvent-/modification-free and precursor-/time-saving synthesis. The uniform MOF membranes thus prepared have controllable thicknesses, down to ~17?nm, and show one to three orders of magnitude higher gas permeances than those of conventional membranes, up to 215.4?×?10-7?mol?m-2?s-1?Pa-1 for H2, and H2/C3H8, CO2/C3H8 and C3H6/C3H8 selectivities of as high as 3,400, 1,030 and 70, respectively. We further demonstrate the in situ scale-up processing of a MOF membrane module (30 polymeric hollow fibres with membrane area of 340?cm2) without deterioration in selectivity.MOF-based membranes have shown great promise in separation applications, but producing thin membranes that allow for high fluxes remains challenging. Here, the authors use a gel-vapour deposition strategy to fabricate composite membranes with less than 20 nm thicknesses and high gas permeances and selectivities.

SUBMITTER: Li W 

PROVIDER: S-EPMC5581339 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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Ultrathin metal-organic framework membrane production by gel-vapour deposition.

Li Wanbin W   Su Pengcheng P   Li Zhanjun Z   Xu Zehai Z   Wang Fei F   Ou Huase H   Zhang Jiaheng J   Zhang Guoliang G   Zeng Eddy E  

Nature communications 20170901 1


Ultrathin, molecular sieving membranes composed of microporous materials offer great potential to realize high permeances and selectivities in separation applications, but strategies for their production have remained a challenge. Here we show a route for the scalable production of nanometre-thick metal-organic framework (MOF) molecular sieving membranes, specifically via gel-vapour deposition, which combines sol-gel coating with vapour deposition for solvent-/modification-free and precursor-/ti  ...[more]

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