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Modulated UiO-66-Based Mixed-Matrix Membranes for CO2 Separation.

M Waqas Anjum¹, Frederik Vermoortele¹, Asim Laeeq Khan²

¹Centre for Surface Chemistry and Catalysis, Faculty of Bioscience Engineering, KU Leuven , Kasteelpark Arenberg 23, Box 2461, 3001 Leuven, Belgium.

ACS Applied Materials & Interfaces

|October 13, 2015

Summary

This study developed advanced mixed-matrix membranes (MMMs) using polyimide and functionalized metal-organic frameworks (MOFs) for efficient CO2/CH4 separation. The novel MMMs exhibit significantly enhanced selectivity and permeability, crucial for carbon capture applications.

Keywords:

CO2/CH4 separation UiO-66 gas separation mixed-matrix membranes modulated MOFs

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Area of Science:

Materials Science
Chemical Engineering
Separation Science

Background:

Mixed-matrix membranes (MMMs) are promising for gas separation.
Polyimide (PI) and metal-organic frameworks (MOFs) offer unique properties.
Improving MOF-polymer compatibility and MOF intrinsic performance is key.

Purpose of the Study:

To synthesize novel MMMs using Matrimid (PI) and zirconium terephthalate UiO-66 (MOF).
To enhance MOF separation performance and particle-PI compatibility via modulation and amine functionalization.
To investigate the effect of amine groups and linker vacancies on CO2 transport.

Main Methods:

Synthesized UiO-66 MOF fillers using a modulation approach with amine-functionalized linkers.
Incorporated MOF fillers into a Matrimid polyimide matrix to form MMMs.
Tested MMMs for CO2/CH4 mixed-gas separation performance.

Main Results:

Amine functionalization led to covalent linking between MOF fillers and the polyimide matrix, ensuring membrane stability.
Amine groups within MOF pores and linker vacancies positively influenced CO2 transport.
MMMs with 30 wt% MOF loading achieved a mixed-gas selectivity of 47.7 and permeability of 19.4 barrer for CO2/CH4.

Conclusions:

The developed MMMs demonstrate superior CO2/CH4 separation performance compared to unfilled membranes.
Amine-functionalized MOFs and modulation are effective strategies for enhancing MMMs for gas separation.
These advanced MMMs show significant potential for carbon capture technologies.