Enhanced Interfacial Interaction and CO2 Separation Performance of Mixed Matrix Membrane by Incorporating Polyethylenimine-Decorated Metal–Organic Frameworks

Polyethylenimine (PEI) was immobilized by MIL-101­(Cr) (∼550 nm) via a facile vacuum-assisted method, and the obtained PEI@MIL-101­(Cr) was then incorporated into sulfonated poly­(ether ether ketone) (SPEEK) to fabricate mixed matrix membranes (MMMs). High loading and uniform dispersion of PEI in MI...

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Veröffentlicht in:ACS applied materials & interfaces 2015-01, Vol.7 (2), p.1065-1077
Hauptverfasser: Xin, Qingping, Ouyang, Jingyi, Liu, Tianyu, Li, Zhao, Li, Zhen, Liu, Yuchen, Wang, Shaofei, Wu, Hong, Jiang, Zhongyi, Cao, Xingzhong
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container_title ACS applied materials & interfaces
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creator Xin, Qingping
Ouyang, Jingyi
Liu, Tianyu
Li, Zhao
Li, Zhen
Liu, Yuchen
Wang, Shaofei
Wu, Hong
Jiang, Zhongyi
Cao, Xingzhong
description Polyethylenimine (PEI) was immobilized by MIL-101­(Cr) (∼550 nm) via a facile vacuum-assisted method, and the obtained PEI@MIL-101­(Cr) was then incorporated into sulfonated poly­(ether ether ketone) (SPEEK) to fabricate mixed matrix membranes (MMMs). High loading and uniform dispersion of PEI in MIL-101­(Cr) were achieved as demonstrated by ICP, FT-IR, XPS, and EDS-mapping. The PEI both in the pore channels and on the surface of MIL-101­(Cr) improved the filler–polymer interface compatibility due to the electrostatic interaction and hydrogen bond between sulfonic acid group and PEI, and simultaneously rendered abundant amine carriers to facilitate the transport of CO2 through reversible reaction. MMMs were evaluated in terms of gas separation performance, thermal stability, and mechanical property. The as-prepared SPEEK/PEI@MIL-101­(Cr) MMMs showed increased gas permeability and selectivity, and the highest ideal selectivities for CO2/CH4 and CO2/N2 were 71.8 and 80.0 (at a CO2 permeability of 2490 Barrer), respectively. Compared with the membranes doped with unfilled MIL-101­(Cr), the ideal selectivities of CO2/CH4 and CO2/N2 for PEI@MIL-101­(Cr)-doped membranes were increased by 128.1 and 102.4 %, respectively, at 40 wt % filler loading, surpassing the 2008 Robeson upper bound line. Moreover, the mechanical property and thermal stability of SPEEK/PEI@MIL-101­(Cr) were enhanced.
doi_str_mv 10.1021/am504742q
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Mater. Interfaces</addtitle><date>2015-01-21</date><risdate>2015</risdate><volume>7</volume><issue>2</issue><spage>1065</spage><epage>1077</epage><pages>1065-1077</pages><issn>1944-8244</issn><eissn>1944-8252</eissn><abstract>Polyethylenimine (PEI) was immobilized by MIL-101­(Cr) (∼550 nm) via a facile vacuum-assisted method, and the obtained PEI@MIL-101­(Cr) was then incorporated into sulfonated poly­(ether ether ketone) (SPEEK) to fabricate mixed matrix membranes (MMMs). High loading and uniform dispersion of PEI in MIL-101­(Cr) were achieved as demonstrated by ICP, FT-IR, XPS, and EDS-mapping. The PEI both in the pore channels and on the surface of MIL-101­(Cr) improved the filler–polymer interface compatibility due to the electrostatic interaction and hydrogen bond between sulfonic acid group and PEI, and simultaneously rendered abundant amine carriers to facilitate the transport of CO2 through reversible reaction. MMMs were evaluated in terms of gas separation performance, thermal stability, and mechanical property. The as-prepared SPEEK/PEI@MIL-101­(Cr) MMMs showed increased gas permeability and selectivity, and the highest ideal selectivities for CO2/CH4 and CO2/N2 were 71.8 and 80.0 (at a CO2 permeability of 2490 Barrer), respectively. Compared with the membranes doped with unfilled MIL-101­(Cr), the ideal selectivities of CO2/CH4 and CO2/N2 for PEI@MIL-101­(Cr)-doped membranes were increased by 128.1 and 102.4 %, respectively, at 40 wt % filler loading, surpassing the 2008 Robeson upper bound line. Moreover, the mechanical property and thermal stability of SPEEK/PEI@MIL-101­(Cr) were enhanced.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>25525969</pmid><doi>10.1021/am504742q</doi><tpages>13</tpages></addata></record>
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