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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Updated: Dec 13, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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CO2/N2 Separation Properties of Polyimide-Based Mixed-Matrix Membranes Comprising UiO-66 with Various

Chong Yang Chuah1, Junghyun Lee2, Juha Song2

  • 1Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore.

Membranes
|July 26, 2020
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Summary

Functionalized nanocrystals in polyimide membranes enhance carbon dioxide (CO2) separation. UiO-66 derivatives significantly boost CO2/N2 selectivity, offering a promising strategy for gas separation technologies.

Keywords:
CO2 captureUiO-66mixed-matrix membranepolyimidepre-synthetic functionalization

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Mixed-matrix membranes (MMMs) are crucial for gas separation.
  • Polyimide membranes offer good processability but require performance enhancement for CO2/N2 separation.

Purpose of the Study:

  • To develop advanced MMMs for efficient CO2/N2 separation.
  • To investigate the impact of functionalized UiO-66 nanocrystals on membrane performance.

Main Methods:

  • Synthesis of nanocrystalline UiO-66 and its functionalized derivatives (-NH2, -Br, -(OH)2).
  • Incorporation of UiO-66 nanocrystals into a polyimide matrix to form MMMs.
  • Evaluation of CO2/N2 separation performance using permeability and selectivity measurements.
  • Solubility-diffusivity analysis to elucidate separation mechanisms.

Main Results:

  • Non-functionalized UiO-66 improved CO2 permeability but slightly decreased selectivity.
  • Functionalized UiO-66 derivatives (UiO-66-NH2, UiO-66-Br, UiO-66-(OH)2) enhanced CO2/N2 selectivity by 12%, 4%, and 17%, respectively.
  • Functionalized UiO-66 increased CO2 diffusivity and suppressed N2 sorption in the MMMs.

Conclusions:

  • Structural tuning of UiO-66 via functionalization is an effective strategy for enhancing CO2 separation in MMMs.
  • The developed MMMs show significant potential for industrial CO2/N2 separation applications.