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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

PIM-1 TixUiO-66 (5 wt.%) membranes plotted against the Robeson Upper Bound7 (2008).Arrows highlight effect of UiO-66 inclusion and Ti exchange
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f8: PIM-1 TixUiO-66 (5 wt.%) membranes plotted against the Robeson Upper Bound7 (2008).Arrows highlight effect of UiO-66 inclusion and Ti exchange

Mentions: This work reports the study of the gas permeation performance of mixed matrix membranes developed specifically for improving CO2/N2 separation performance for the application of carbon capture and sequestration. The hypothesised amalgamation of PIM-1, a polymer already near the Robeson upper bound, and a previously demonstrated MOF of high CO2 affinity, Ti-exchanged UiO-66, generated a significant increase in membrane CO2 permeability (13500 Barrer, +274%). This improvement was achieved without selectivity loss, exceeding the CO2/N2 Robeson Upper bound (Figure 8) and the separation performance of a number of other high performance mixed matrix membranes. This study highlights the potential advantages of matching materials and tuning the surface of nanoparticles in polymeric mixed matrix membranes. The strong interaction between TixUiO-66's exposed metal centres to PIM-1 polymer has significant effects on the formation of interfacial free volume, generating a significant increase in permeability at the optimal loading of 5 wt.%, a loading significantly lower than peak performance of other MMM's (40–60%). This study also provides a validation for research involving transmetallation of MOFs as a route to further improve mixed matrix membrane performance.


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)

PIM-1 TixUiO-66 (5 wt.%) membranes plotted against the Robeson Upper Bound7 (2008).Arrows highlight effect of UiO-66 inclusion and Ti exchange
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f8: PIM-1 TixUiO-66 (5 wt.%) membranes plotted against the Robeson Upper Bound7 (2008).Arrows highlight effect of UiO-66 inclusion and Ti exchange
Mentions: This work reports the study of the gas permeation performance of mixed matrix membranes developed specifically for improving CO2/N2 separation performance for the application of carbon capture and sequestration. The hypothesised amalgamation of PIM-1, a polymer already near the Robeson upper bound, and a previously demonstrated MOF of high CO2 affinity, Ti-exchanged UiO-66, generated a significant increase in membrane CO2 permeability (13500 Barrer, +274%). This improvement was achieved without selectivity loss, exceeding the CO2/N2 Robeson Upper bound (Figure 8) and the separation performance of a number of other high performance mixed matrix membranes. This study highlights the potential advantages of matching materials and tuning the surface of nanoparticles in polymeric mixed matrix membranes. The strong interaction between TixUiO-66's exposed metal centres to PIM-1 polymer has significant effects on the formation of interfacial free volume, generating a significant increase in permeability at the optimal loading of 5 wt.%, a loading significantly lower than peak performance of other MMM's (40–60%). This study also provides a validation for research involving transmetallation of MOFs as a route to further improve mixed matrix membrane performance.

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