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Mixed Matrix Membranes Using Porous Organic Polymers (POPs)-Influence of Textural Properties on CO2/CH4 Separation.

Laura Matesanz-Niño1,2, Jorge Moranchel-Pérez3, Cristina Álvarez1,2

  • 1Department of Applied Macromolecular Chemistry, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain.

Polymers
|October 28, 2023
PubMed
Summary

New porous organic polymer (POP) networks were synthesized and incorporated into mixed matrix membranes (MMMs) for CO2/CH4 separation. Biopolymer-based MMMs showed promising performance, approaching that of Pebax-based membranes.

Keywords:
CO2/CH4 separationMatrimidMaxwell phenomenological equationsPebaxbiopolymersgas separationmixed matrix membranes (MMMs)porous organic polymers (POPs)

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Technology

Background:

  • Mixed matrix membranes (MMMs) offer a platform for integrating novel porous materials.
  • Porous organic polymers (POPs) exhibit tunable porosity and high CO2 uptake, making them promising fillers.
  • Efficient CO2 capture and separation are critical for environmental and industrial applications.

Purpose of the Study:

  • To synthesize low-cost porous organic polymer (POP) networks.
  • To fabricate and evaluate mixed matrix membranes (MMMs) incorporating these POPs for CO2/CH4 separation.
  • To investigate the effect of POP filler properties and polymer matrix compatibility on membrane performance.

Main Methods:

  • Synthesis of POPs via aromatic electrophilic substitution.
  • Characterization of POPs using FTIR, NMR, WAXD, TGA, SEM, and CO2 uptake measurements.
  • Fabrication of MMMs with POPs in Matrimid, Pebax, and chitosan:polyvinyl alcohol (CS:PVA) matrices.
  • Gas permeation experiments (single and mixed gas) at 4 bar and room temperature.
  • Analysis using Maxwell model equations.

Main Results:

  • Synthesized POPs with tunable porosity and high CO2 uptake.
  • MMM performance was evaluated, showing deviations from the Maxwell model with increasing POP porosity and polymer matrix hydrophilicity.
  • Biopolymer-based CS:PVA MMMs demonstrated separation performance comparable to Pebax-based MMMs.

Conclusions:

  • Developed novel POPs as effective fillers for MMMs.
  • Demonstrated the potential of sustainable biopolymer matrices (CS:PVA) for gas separation membranes.
  • Highlighted the importance of filler-matrix interactions in designing high-performance MMMs for CO2/CH4 separation.