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Efficient CO2/CH4 Separation Using Polysulfone/NH2-MIL-125(Ti) Mixed Matrix Membranes
Mustafa Alsaady1, Sharjeel Waqas2, Muhammad Hamad Zeeshan2
1Chemical Engineering Department, University of Jeddah, Jeddah 23890, Kingdom of Saudi Arabia.
ACS Omega
|April 7, 2025
Summary
This study developed advanced mixed matrix membranes (MMMs) using NH2-MIL-125(Ti) metal-organic frameworks in a polysulfone matrix for superior CO2/CH4 separation. The optimized membranes show enhanced selectivity and resistance to CO2 plasticization.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Science
Background:
- Mixed matrix membranes (MMMs) offer potential for gas separation.
- Polysulfone (PSf) membranes suffer from CO2 plasticization.
- Metal-organic frameworks (MOFs) can enhance membrane performance.
Purpose of the Study:
- To fabricate and optimize polysulfone-based MMMs incorporating NH2-MIL-125(Ti) MOF for CO2/CH4 separation.
- To evaluate the impact of NH2-MIL-125(Ti) on membrane morphology, gas permeability, selectivity, and plasticization resistance.
- To compare the performance of MMMs with pristine PSf membranes.
Main Methods:
- Solution casting method for MMM fabrication.
- Gas permeation setup for performance evaluation (permeability and selectivity).
- Morphological characterization of the membranes.
Main Results:
- Incorporation of NH2-MIL-125(Ti) enhanced CO2/CH4 selectivity and maintained permeability.
- The PSf/NH2-MIL-125(Ti)-15% membrane achieved 19.17 Barrer CO2 permeability and 31.95 CO2/CH4 selectivity.
- MMMs exhibited significantly improved resistance to CO2 plasticization (up to 14 bar) compared to PSf membranes (4 bar).
Conclusions:
- The developed PSf/NH2-MIL-125(Ti) MMMs are highly effective for CO2 separation.
- These MMMs demonstrate superior performance metrics over traditional PSf membranes.
- The findings highlight the potential of NH2-MIL-125(Ti) incorporation for advanced industrial gas separation applications.
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