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Constructing rapid water vapor transport channels within mixed matrix membranes based on two-dimensional mesoporous nanosheets

ABSTRACT: Membrane technology is an effective strategy for gas dehumidification and fuel cell humidification. In this study, cerium fluoride oxide (F-Ce) two-dimensional (2D) mesoporous nanosheets and their composite with 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) ionic liquids (ILs) (IL@F-Ce) are introduced as fillers into polyether block amide (PEBAX® 1074) to fabricate mixed matrix membranes (MMMs). The slit-shaped mesoporous structure of the nanosheets facilitates the construction of water vapor rapid transport channels in MMMs. The permeability and selectivity of water vapor for MMMs loaded with F-Ce nanosheets are greatly improved, and the performance of MMMs loaded with IL@F-Ce nanosheets are much better than the former. Particularly, the MMM with IL@F-Ce content of 4 wt.% achieves the highest H2O permeability of 4.53 × 105 Barrer, which is more than twice that of the pure PEBAX membrane, and the selectivity is increased by 83%. Thus, the MMMs based on 2D mesoporous nanosheets have considerable potential application in industrial-scale dehydration and humidification processes. Gas dehumidification with permeable membranes is typically a technique low in operating costs and environmental impact, making it preferable over condensation or adsorption methods, but membrane permeability and selectivity remain a trade-off. Here, the authors use cerium fluoride oxide mesoporous nanosheets in the ionic liquid [Emim][DCA] as a filler in the polyether block amide PEBAX to achieve a mixed matrix membrane with a water vapour permeability of 4.53 × 105 Barrer and a H2O/N2 selectivity of 1.69 × 105.

SUBMITTER: Wang F

PROVIDER: S-EPMC9814085 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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