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Bipyridine-based UiO-67 as novel filler in mixed-matrix membranes for CO2-selective gas separation

Journal Contribution - Journal Article

© 2019 Elsevier B.V. Bipyridine-based UiO-67 Metal-Organic Frameworks (MOFs) are for the first time successfully applied as filler material in Matrimid mixed-matrix membranes (MMMs). Extensive characterization of fillers (via XRD, NMR, SEM, ATR-FTIR, CO 2 and N 2 physisorption) and membranes (via XRD, SEM, ATR-FTIR, DSC, TGA and PALS) were performed to gain insight in the MMM separation behavior. Lewis basic sites in the MMMs function as CO 2 -carriers, doubling CO 2 /CH 4 selectivity (from 38 for pristine Matrimid to 75 for the MMM with 10 wt% UiO-67-33), while the CO 2 permeability was simultaneously improved from 16 Barrer (Matrimid) up till 26 Barrer for the MMM with 10 wt% UiO-67-33 (+63%). Gas permeation experiments suggested a facilitated transport mechanism to be responsible for these high mixed-gas selectivities. The concentration of the filler inside the membrane could be increased to 30 wt%, resulting in a permeability increase of 350% without losing selectivity compared to the Matrimid membrane. Use of N-heterocyclic ligands proved to be an interesting strategy and good alternative for functionalization of MOF surfaces to obtain improved membrane performance.
Journal: Journal of Membrane Science
ISSN: 0376-7388
Volume: 576
Pages: 78 - 87
Publication year:2019
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:10
CSS-citation score:4
Authors:International
Authors from:Higher Education
Accessibility:Open