Abstract
The performance of two generation-3 light-responsive metal-organic framework (MOF), namely JUC-62 and PCN-250, was investigated in a mixed matrix membrane (MMM) form. Both of them were incorporated inside the matrimid as the polymer matrix. Using our custom-designed membrane testing cell, it was observed that the MMMs showed up to 9% difference in CO2 permeability between its pristine and UV-irradiated condition. This shows that the light-responsive ability of the light-responsive MOFs could still be maintained. Thus, this finding is applicable in designing a smart material. Apart from that, the MMMs also has the potential to be applied for post-combustion carbon capture. At loadings up to 15 wt%, both CO2 permeability and CO2/N2 ideal selectivity could be significantly improved and surpassed the value exhibited by most of the MOF-matrimid MMM. Lastly the long term performance of the MMM was also evaluated and it was observed that both MMM could maintain their performance up to 1 month with only a slight decrease in CO2 permeability observed for 10 wt% PCN-250-matrimid. This study then opens up the possibility to fabricate a novel anti-aging multifunctional membrane material that is applicable as a smart material and also in post combustion carbon capture applications.
Highlights
Membranes have been widely investigated for various promising applications ranging from energy-related application to smart material[1,2]
JUC-62 and PCN-250 can be classified as ones of the most recent generation-3 light-responsive metal-organic framework (MOF) since they are built from a responsive framework
Both JUC-62 and PCN-250-matrimid mixed matrix membranes were characterized by using various characterization techniques such as PXRD, Fourier Transformed Infrared Spectroscopy (FTIR), Thermogravimetric analysis (TGA) and Scanning Electron Microscopy (SEM)
Summary
For the MOFs used in this study, the degradation of the framework was observed to start at around 300 °C where JUC-62 and PCN-250 underwent total and partial degradation, respectively This temperature is below the glass transition temperature of matrimid which is reported to be around 320 °C. Negligible loss of permeability exhibited by matrimid studied under this particular wavelength was quite important to later observe the switching phenomenon in the mixed matrix membrane This was further proven by another control experiment using 8 wt% ZIF-8-matrimid mixed matrix membrane. This importance of this control experiment was to observe the behaviour of a mixed matrix membrane that was loaded with MOF that does not have any light-responsive ability. Membrane Matrimid 8 wt% ZIF-8-matrimid 5 wt% JUC-62-matrimid 10 wt% JUC-62-matrimid 15 wt% JUC-62-matrimid 5 wt% PCN-250-matrimid 10 wt% PCN-250-matrimid
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