Enhancing the CO2 separation performance of polymer membranes via the incorporation of amine-functionalized HKUST-1 nanocrystals

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HKUST-1 nanocrystals with large accessible surface areas and high porosity were functionalized with amine groups and incorporated into polymer matrices to form mixed-matrix membranes for application in CO2 capture. This gas permeation study reveals that pristine HKUST-1 nanocrystals are able to increase the gas permeabilities of polymer membranes with no noticeable effect on CO2/N-2 selectivity as a result of their high porosity and large pore dimensions. Contrarily, 20 wt% amine-functionalized HKUST-1 can improve the CO2/N-2 selectivity of polymer membranes by as much as 38%. As shown in a detailed analysis of the diffusivity-solubility, the amine-functionalized HKUST-1 suppressed N-2 solubility and diffusivity but enhanced CO2 diffusivity. This resulted in an increased CO2/N-2 perm-selectivity. Meanwhile, the pristine HKUST-1 nanocrystals increased the diffusivity and solubility of both species in a non-selective manner. These results indicate the feasibility of tuning the CO2 separation performance of mixed-matrix membranes by introducing amine functionality into the filler.
Publisher
ELSEVIER
Issue Date
2019-12
Language
English
Article Type
Article
Citation

MICROPOROUS AND MESOPOROUS MATERIALS, v.290, pp.109680

ISSN
1387-1811
DOI
10.1016/j.micromeso.2019.109680
URI
http://hdl.handle.net/10203/268064
Appears in Collection
CBE-Journal Papers(저널논문)
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