Hierarchical ZIF-8 composite membranes: Enhancing gas separation performance by exploiting molecular dynamics in hierarchical hybrid materials
| Autor: | Ivo F.J. Vankelecom, Joeri Denayer, Gino Baron, Lik Hong Wee, Salman Shahid, Johan A. Martens |
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| Přispěvatelé: | Centre for Molecular Separation Science & Technology, Vriendenkring VUB, Chemical Engineering and Industrial Chemistry, Chemical Engineering and Separation Science, Department of Bio-engineering Sciences |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Engineering Chemical Materials science ADSORPTION PLASTICIZATION BEHAVIOR Metal-organic framework Polymer Science Filtration and Separation 02 engineering and technology PRESSURE 010402 general chemistry SORPTION 01 natural sciences Biochemistry Mixed matrix membranes METAL-ORGANIC FRAMEWORKS Engineering Micro- and mesoporous General Materials Science Gas separation PERMEABILITY Physical and Theoretical Chemistry MIXED-MATRIX MEMBRANES Hierarchical ZIF-8 TEMPERATURE chemistry.chemical_classification Molecular diffusion Science & Technology Polymer Porosimetry 021001 nanoscience & nanotechnology TRANSPORT 0104 chemical sciences Membrane chemistry Chemical engineering Physical Sciences CO2/CH4 separation CO2 0210 nano-technology Hybrid material Polyimide |
| Popis: | Mixed matrix membranes (MMM) incorporating metal-organic framework (MOF) fillers have gained increasing attention in addressing environmental and sustainability challenges. Hierarchical materials combining pore sizes of different length scales are expected to facilitate molecular diffusion and mass transfer for the optimization of catalysis and separation processes. Herein, a novel preparation method for hierarchical ZIF-8 (H-ZIF-8) particles is presented for the synthesis of polyimide (PI)-based MMMs with good compatibility between filler and polymer. Gas permeability measurements of polyimide-Matrimid®/H-ZIF-8 MMMs showed 4-fold improvements in permeability of both CO2 and CH4 coupled with a marked increase in selectivity and plasticization resistance for MMM with 30 wt% H-ZIF-8 loading. Gas transport analysis in these MMMs revealed that the enhanced gas separation performance of the MMMs can be related to the imidazolate modification of the PI structure and the hierarchical structure of H-ZIF-8, as confirmed by N2, Ar, mercury porosimetry, SEM, TEM analysis. CO2 permeability for all MMMs increases with increasing CO2 concentration and by decreasing temperature. The proof of concept, as demonstrated in this study, could be extended for the preparation of other hierarchical ZIFs and related MMMs. |
| Databáze: | OpenAIRE |
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