1. Ultrathin metal–organic framework membrane production by gel–vapour deposition
- Author
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Wanbin Li, Pengcheng Su, Jiaheng Zhang, Guoliang Zhang, Huase Ou, Fei Wang, Zehai Xu, Zhanjun Li, and Eddy Y. Zeng
- Subjects
Materials science ,Science ,General Physics and Astronomy ,Nanotechnology ,02 engineering and technology ,engineering.material ,Vapour deposition ,010402 general chemistry ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,Coating ,Deposition (phase transition) ,lcsh:Science ,Multidisciplinary ,technology, industry, and agriculture ,General Chemistry ,Microporous material ,Orders of magnitude (numbers) ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Membrane ,engineering ,Metal-organic framework ,lcsh:Q ,0210 nano-technology ,Selectivity - 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.
- Published
- 2017