Journal
POLYMERS & POLYMER COMPOSITES
Volume 29, Issue 9_SUPPL, Pages S707-S718Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/09673911211023303
Keywords
Mixed matrix membranes; metal organic frameworks; selectivity; mixed gases; gas separation
Categories
Funding
- MEMAR Lab at School of Chemical and Materials Engineering, National University of Sciences and Technology
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The addition of more filler can increase the gas permeability of ZIF membranes, but it can also cause structural defects and decrease tensile strength. When choosing high-loaded membranes, the selectivity is better, while the tensile strength of low-loaded membranes is higher, requiring a balance to choose the suitable membrane.
Dense and translucent CA/PEG 1000/ZIF membranes were synthesized in acetone, utilizing solution casting. Membrane characterization was carried out using FT-IR, SEM and tensile testing. SEM proved presence of dense membranes and increase in the filler amount may have formed voids, raising the permeability of both gases. Single and mixed gas (CO2/CH4) permeation testing showed an increased permeability, on addition of more filler, which is probably due to formation of nano-gaps. A maximum selectivity of 39.49 and 34.86 for single and mixed gases respectively, and maximum permeabilities of 49.7685 and 1.41 barrers were observed. Tensile testing showed that strength peaked then decreased on increased loading, due to agglomeration on adding more ZIF, which introduced defects in structure. To conclude, selectivity of higher loaded membranes is favourable whereas tensile strength of lower loaded membrane is superior, but we have a trade-off between selectivity and tensile strength, so a higher-loaded membrane is most suitable. [GRAPHICS] .
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