Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 31, Pages 15064-15073Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta03872d
Keywords
-
Funding
- National Natural Science Foundation of China [21676063, U1462103]
- Open Project of State Key Laboratory of Urban Water Resource and Environment (Harbin Institute Technology) [HC201706]
- HIT Environment and Ecology Innovation Special Funds [HSCJ201619]
Ask authors/readers for more resources
Both material choice and filler/organic interface are crucial in mixed matrix membranes (MMMs) for subnano- size gas separations and yet, the interface-performance relationship is still a subject of intense debate due to challenging interfacial detection. Herein, two UiO-66-type MOFs (amino-functionalized UiO-66-NH2 and isopropenyl-functionalized UiO-66-MA) are incorporated in cross-linked CO2-philic polyethylene oxide (PEO) matrix based on judicious material screening for CO2 capture. The reactive material UiO-66-MA is stitched together with methacrylate-capped PEO in situ during UV-induced copolymerization to generate highly efficient gas transport passages with conceivably good interfaces. Poor interface is observed by substituting UiO-66-MA with non-reactive UiO-66-NH2 in MPCM (MOF/ polymer composite membrane). The interfacial conditions of CO2-philic MPCMs are carefully assessed via advanced physicochemical characterizations for clarifying the correlation between interface and separation performance. The reactive material UiO-66-MA containing MPCM with good interface demonstrates higher gas permeability (up to 1450 barrers) with similar selectivity (up to 45.8 for CO2/N-2) when compared to non-reactive UiO-66-NH2 containing MPCM. The mixed gas test also shows high CO2 permeability of 1439 barrer and CO2/N-2 selectivity of 37.6 in our MPCM. We also observe unexpected suppressed plasticization/swelling behaviour in UiO-66-MA containing MPCM and enhanced plasticization in UiO-66-NH2 containing MPCM through analysis of gas separation performance in the range of 1-10 atm, which might be utilized as a potential interface assessment tool for nanocomposites. Moreover, the performances of our CO2-philic MPCMs can be optimized further to surpass the (2008) Robeson Upper Bound for highly efficient sustainable CO2 capture.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available