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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

Cross sectional SEM images of PIM-1 Ti5UiO-66 membranes 2.6 wt.% (A, B) and 15 wt.% (C, D), respectively.Highlighted regions of (A, C) are shown at higher magnification to identify MOF locations in images (B, D), respectively.
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f5: Cross sectional SEM images of PIM-1 Ti5UiO-66 membranes 2.6 wt.% (A, B) and 15 wt.% (C, D), respectively.Highlighted regions of (A, C) are shown at higher magnification to identify MOF locations in images (B, D), respectively.

Mentions: SEM images of PIM-1 Ti5UiO-66 membranes (Figure 5) exhibit surface topologies similar to previously reported mixed matrix membranes23344244, characteristic of particle interaction at the polymer interface. Images also reveal agglomeration of TixUiO-66 MOF at higher loadings, which increases effective particle size.


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)

Cross sectional SEM images of PIM-1 Ti5UiO-66 membranes 2.6 wt.% (A, B) and 15 wt.% (C, D), respectively.Highlighted regions of (A, C) are shown at higher magnification to identify MOF locations in images (B, D), respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Cross sectional SEM images of PIM-1 Ti5UiO-66 membranes 2.6 wt.% (A, B) and 15 wt.% (C, D), respectively.Highlighted regions of (A, C) are shown at higher magnification to identify MOF locations in images (B, D), respectively.
Mentions: SEM images of PIM-1 Ti5UiO-66 membranes (Figure 5) exhibit surface topologies similar to previously reported mixed matrix membranes23344244, characteristic of particle interaction at the polymer interface. Images also reveal agglomeration of TixUiO-66 MOF at higher loadings, which increases effective particle size.

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