Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation
Membrane technology is a promising methodology for carbon dioxide separation due to its benefit of a small carbon footprint. However, the trade-off relationship between gas permeability and selectivity is one obstacle to limiting its application. Herein, branched polyethyleneimine (BPEI) containing...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Membranes |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-0375/15/1/26 |
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| Summary: | Membrane technology is a promising methodology for carbon dioxide separation due to its benefit of a small carbon footprint. However, the trade-off relationship between gas permeability and selectivity is one obstacle to limiting its application. Herein, branched polyethyleneimine (BPEI) containing a rich amino group was successfully grafted on the surface of the metal–organic framework (MOF) of AIFFIVE-1-Ni (KAUST-8) through coordination between N in BPEI and open metal sites in the MOF and with the resultant maintained BET surface area and pore volume. Both the strengthened CO<sub>2</sub> solubility coefficients coming from the additional CO<sub>2</sub> adsorption sites of amino groups in BPEI and the reinforced CO<sub>2</sub> diffusivity coefficients originating from the fast transport channels created by KAUST-8 led to the promising CO<sub>2</sub> separation performance for KAUST-8@BPEI/Pebax-1074 MMM. With 5 wt.% KAUST-8@BPEI loading, the MMM showed the CO<sub>2</sub> permeability of 156.5 Barrer and CO<sub>2</sub>/N<sub>2</sub> selectivity of 16.1, while the KAUST-8-incorporated MMM (5 wt.% loading) only exhibited the CO<sub>2</sub> permeability of 86.9 Barrer and CO<sub>2</sub>/N<sub>2</sub> selectivity of 13.0. Such enhancement is superior to most of the reported Pebax-1074-based MMMs for CO<sub>2</sub> separation indicating a wide application for the coordination method for MOF fillers with open metal sites. |
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| ISSN: | 2077-0375 |