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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MDPI AG
2025-01-01
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| author | Rujing Hou Junwei Xie Yawei Gu Lei Wang Yichang Pan |
| author_facet | Rujing Hou Junwei Xie Yawei Gu Lei Wang Yichang Pan |
| author_sort | Rujing Hou |
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| description | 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. |
| format | Article |
| id | doaj-art-2f72f0749e5e45c3857d666c07d0e416 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| series | Membranes |
| spelling | doaj-art-2f72f0749e5e45c3857d666c07d0e4162025-01-24T13:41:04ZengMDPI AGMembranes2077-03752025-01-011512610.3390/membranes15010026Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> SeparationRujing Hou0Junwei Xie1Yawei Gu2Lei Wang3Yichang Pan4State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, ChinaMembrane 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.https://www.mdpi.com/2077-0375/15/1/26mixed-matrix membranemetal–organic frameworkcarbon capturegrafting |
| spellingShingle | Rujing Hou Junwei Xie Yawei Gu Lei Wang Yichang Pan Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation Membranes mixed-matrix membrane metal–organic framework carbon capture grafting |
| title | Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation |
| title_full | Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation |
| title_fullStr | Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation |
| title_full_unstemmed | Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation |
| title_short | Simultaneously Enhanced Permeability and Selectivity of Pebax-1074-Based Mixed-Matrix Membrane for CO<sub>2</sub> Separation |
| title_sort | simultaneously enhanced permeability and selectivity of pebax 1074 based mixed matrix membrane for co sub 2 sub separation |
| topic | mixed-matrix membrane metal–organic framework carbon capture grafting |
| url | https://www.mdpi.com/2077-0375/15/1/26 |
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