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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Ionic Liquids as the MOFs/Polymer Interfacial Binder for Efficient Membrane Separation.

Rijia Lin1, Lei Ge1, Hui Diao1

  • 1School of Chemical Engineering and ‡Centre for Microscopy & Microanalysis, Faculty of Science, The University of Queensland , Brisbane 4072, Australia.

ACS Applied Materials & Interfaces
|December 10, 2016
PubMed
Summary

Improving mixed matrix membranes (MMMs) requires strong filler-polymer interactions. Immobilizing ionic liquid on metal-organic frameworks (MOFs) enhances compatibility, reduces voids, and boosts CO2 selectivity in MMMs.

Keywords:
gas separationinterfacial binderionic liquidmetal−organic frameworksmixed matrix membrane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Science

Background:

  • Achieving high separation efficiency in mixed matrix membranes (MMMs) hinges on strong interfacial affinity between fillers and the polymer matrix.
  • Incorporating micron-sized metal-organic frameworks (MOFs) into polymers often results in interfacial voids and poor compatibility, hindering membrane performance.
  • Defect-free interfaces are crucial for preventing nonselective pathways and enhancing gas separation capabilities.

Purpose of the Study:

  • To develop a method for improving the interfacial compatibility of micron-sized MOFs within polymer matrices for enhanced membrane performance.
  • To investigate the efficacy of immobilizing ionic liquid (IL) onto MOFs as an interfacial binder to eliminate nonselective voids.
  • To fabricate and evaluate mixed matrix membranes (MMMs) using IL-decorated MOFs for improved gas separation.

Main Methods:

  • Micron-sized HKUST-1 (a type of MOF) was decorated with a thin layer of ionic liquid (IL).
  • The IL-decorated HKUST-1 was incorporated into a 6FDA-Durene polymer matrix to fabricate MMMs.
  • The performance of MMMs with IL-decorated HKUST-1 was compared to MMMs containing unmodified HKUST-1, focusing on interfacial void formation and CO2 selectivity.

Main Results:

  • The IL decoration effectively eliminated nonselective interfacial voids between the HKUST-1 filler and the 6FDA-Durene polymer matrix.
  • The MOF/IL and IL/polymer interactions acted as an interfacial binder, significantly enhancing filler/polymer affinity.
  • MMMs incorporating IL-decorated HKUST-1 exhibited improved CO2 selectivity compared to those with only HKUST-1.
  • The IL decoration strategy proved effective in mitigating interfacial voids, broadening the applicability of large-sized fillers in MMMs.

Conclusions:

  • Immobilizing ionic liquid on MOFs is a viable strategy to enhance interfacial compatibility and eliminate voids in MMMs.
  • This approach significantly improves the gas separation performance, particularly CO2 selectivity, of MMMs.
  • The IL decoration method offers a promising route for utilizing larger fillers and developing high-performance separation membranes.