Enhancing the Gas Separation Selectivity of Mixed-Matrix Membranes Using a Dual-Interfacial Engineering Approach
| Autor: | Tao Li, Yue-Biao Zhang, Yanhang Ma, Yong Jin Lee, Fang Wang, Sanfeng He, Xiaowen Zhao, Kexin Zhang, Hongliang Wang, Yu Tao, Songwei Zhang, Chunhui Wu, Yaqi Fan |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Chemistry Shell (structure) General Chemistry Polymer 010402 general chemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences Colloid and Surface Chemistry Membrane Chemical engineering Phase (matter) Metal-organic framework Gas separation Crystallite Selectivity |
| Zdroj: | Journal of the American Chemical Society. 142(43) |
| ISSN: | 1520-5126 |
| Popis: | We report a dual-interfacial engineering approach that uses a sub-20 nm polycrystalline MOF-74 shell as a transition phase to engineer the MOF-polymer interface. The application of a shell MOF layer divides the original single interface problem into two interfaces: MOF-MOF and MOF-polymer, which can be individually addressed. The greater external surface area created by the uneven MOF-74 shell containing high-density open metal sites allows the MOF to interact with 300% polymer at the interface compared to traditional MOF, thereby ensuring good interfacial compatibility. When applied on UiO-66-NH2, its respective mixed-matrix membranes exhibit a simultaneous increase of CO2/CH4 separation selectivity and CO2 permeability with increasing MOF loading, implying a defect-free interface. When applied on MOF-801, the mixed-matrix membranes exhibit an ethylene/ethane separation selectivity up to 5.91, a drastic 76% increase compared to that of the neat polymer owing to a "gas focusing" mechanism promoted by the preferred pore orientation in the MOF-74 layer. This represents one of the most selective ethylene/ethane separation membranes reported to date. |
| Databáze: | OpenAIRE |
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