Tortuous mixed matrix membranes: A subtle balance between microporosity and compatibility
| Autor: | Ivo F.J. Vankelecom, Machiel van Essen, Raymond Thür, Menno Houben, Zandrie Borneman, Kitty Nijmeijer |
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| Přispěvatelé: | Membrane Materials and Processes, EIRES Eng. for Sustainable Energy Systems, EIRES Chem. for Sustainable Energy Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Engineering Chemical Materials science Polymer Science THERMAL-STABILITY Zeolitic imidazolate frameworks Filtration and Separation 02 engineering and technology 010402 general chemistry Thermal diffusivity 01 natural sciences Biochemistry Tortuosity law.invention CARBON-DIOXIDE SELECTIVE CAPTURE Mixed matrix membranes Engineering GAS SEPARATION law CO2-Based separations General Materials Science Physical and Theoretical Chemistry Solubility Science & Technology Graphene POLYMER Sheet-like and platelet additives Microporous material PERFORMANCE 021001 nanoscience & nanotechnology NANOSHEETS 0104 chemical sciences Membrane Chemical engineering Physical Sciences GRAPHENE OXIDE CO2 SEPARATION 0210 nano-technology Kinetic diameter Zeolitic imidazolate framework |
| Zdroj: | Journal of Membrane Science, 635:119517. Elsevier |
| ISSN: | 0376-7388 |
| Popis: | In this work, the effectiveness of metal-organic frameworks (MOFs) with sheet-like morphologies was assessed as function of the MOF microporosity and MOF-matrix compatibility. Zeolitic imidazolate frameworks (ZIFs, a MOF subclass) with sheet-like/platelet morphologies were incorporated in Matrimid/PBI matrices resulting in mixed matrix membranes (MMMs). The ZIFs were either permeable (ZIF-301) or impermeable (ZIF-95X) for gases with a kinetic diameter bigger than or equal to the kinetic diameter of CO2. Additionally, MMMs containing impermeable graphene nanosheets were fabricated as reference to confirm the ZIF-95X impermeability. The MMMs containing the ZIF-301 nanoplatelets showed enhanced CO2 permeabilities. Analysis of the N2 and CO2 solubility and diffusivity showed that this permeable additive enhances the solubility of both gases, but only increases the N2 diffusivity through the ZIF-301 MMM. This signified that for MMMs with sheet-like MOFs the MOF micropore volume should only be accessible for one gas such that the sheet-like morphology effectively increases the tortuosity for the other species. Contrarily, the MMMs containing impermeable ZIF-95X and graphene showed declined MMM separation performances. Analysis of the N2 and CO2 diffusivities showed the presence of defective interfaces in these MMMs and proved that an increased tortuosity is only effective if the additive-matrix interface is defect free. |
| Databáze: | OpenAIRE |
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