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Post-synthetic Ti exchanged UiO-66 metal-organic frameworks that deliver exceptional gas permeability in mixed matrix membranes.

Smith SJ, Ladewig BP, Hill AJ, Lau CH, Hill MR - Sci Rep (2015)

Bottom Line: Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs.As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities.The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.

View Article: PubMed Central - PubMed

Affiliation: 1] Monash University, Department of Chemical Engineering, Clayton, VIC 3800, Australia [2] CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia.

ABSTRACT
Gas separation membranes are one of the lowest energy technologies available for the separation of carbon dioxide from flue gas. Key to handling the immense scale of this separation is maximised membrane permeability at sufficient selectivity for CO2 over N2. For the first time it is revealed that metals can be post-synthetically exchanged in MOFs to drastically enhance gas transport performance in membranes. Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs. As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities. These membranes exhibit exceptional CO2 permeability enhancement of as much as 153% when compared to the non-exchanged UiO-66 mixed-matrix controls, which places them well above the Robeson upper bound at just a 5 wt.% loading. The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.

No MeSH data available.


Related in: MedlinePlus

Ti-exchange of UiO-66 MOF increases the interaction with PIM-1 polymer, leading to a drastic increase in CO2 permeability in comparison to a UiO-66 PIM-1 membrane.
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f1: Ti-exchange of UiO-66 MOF increases the interaction with PIM-1 polymer, leading to a drastic increase in CO2 permeability in comparison to a UiO-66 PIM-1 membrane.

Mentions: Recently, we showed that the porous additive PAF-1 can be used to intercalate with the side chains of the polymer, stopping physical aging within the membrane19. A promising approach for improving polymeric membranes is to add filler particles, forming mixed matrix membranes (MMMs)202122. Inorganic fillers such as SiO2232425 or TiO226272829 have been widely explored, and depending on particle agglomeration, can drastically enhance gas transport and separation properties of MMMs. However, owing to the additional gas transport pathways through the pores of porous materials, the incorporation of porous materials into polymer matrices can improve gas transport and separation properties better than their non-porous analogues (Figure 1)303132. Unfortunately, high particle content is usually required to generate optimal separation enhancement, which impacts application costs and can compromise mechanical durability of the composite.


Post-synthetic Ti exchanged UiO-66 metal-organic frameworks that deliver exceptional gas permeability in mixed matrix membranes.

Smith SJ, Ladewig BP, Hill AJ, Lau CH, Hill MR - Sci Rep (2015)

Ti-exchange of UiO-66 MOF increases the interaction with PIM-1 polymer, leading to a drastic increase in CO2 permeability in comparison to a UiO-66 PIM-1 membrane.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4296298&req=5

f1: Ti-exchange of UiO-66 MOF increases the interaction with PIM-1 polymer, leading to a drastic increase in CO2 permeability in comparison to a UiO-66 PIM-1 membrane.
Mentions: Recently, we showed that the porous additive PAF-1 can be used to intercalate with the side chains of the polymer, stopping physical aging within the membrane19. A promising approach for improving polymeric membranes is to add filler particles, forming mixed matrix membranes (MMMs)202122. Inorganic fillers such as SiO2232425 or TiO226272829 have been widely explored, and depending on particle agglomeration, can drastically enhance gas transport and separation properties of MMMs. However, owing to the additional gas transport pathways through the pores of porous materials, the incorporation of porous materials into polymer matrices can improve gas transport and separation properties better than their non-porous analogues (Figure 1)303132. Unfortunately, high particle content is usually required to generate optimal separation enhancement, which impacts application costs and can compromise mechanical durability of the composite.

Bottom Line: Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs.As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities.The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.

View Article: PubMed Central - PubMed

Affiliation: 1] Monash University, Department of Chemical Engineering, Clayton, VIC 3800, Australia [2] CSIRO, Private Bag 33, Clayton South MDC, VIC 3169, Australia.

ABSTRACT
Gas separation membranes are one of the lowest energy technologies available for the separation of carbon dioxide from flue gas. Key to handling the immense scale of this separation is maximised membrane permeability at sufficient selectivity for CO2 over N2. For the first time it is revealed that metals can be post-synthetically exchanged in MOFs to drastically enhance gas transport performance in membranes. Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs. As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities. These membranes exhibit exceptional CO2 permeability enhancement of as much as 153% when compared to the non-exchanged UiO-66 mixed-matrix controls, which places them well above the Robeson upper bound at just a 5 wt.% loading. The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.

No MeSH data available.


Related in: MedlinePlus