Unveiling Advances in Membrane Materials for CO₂ Separation and Direct Air Capture (DAC): From Membrane Design to...

Area of Science:

• Environmental Science
• Chemical Engineering
• Materials Science

Background:

• Rising atmospheric carbon dioxide (CO2) drives climate change and global warming.
• Direct air capture (DAC) technologies are crucial for reducing CO2 levels and limiting global temperature rise.
• Membrane gas separation presents an energy-efficient and scalable alternative to conventional CO2 capture methods.

Purpose of the Study:

• To review current advancements in membrane-based direct air capture (m-DAC) for CO2 removal.
• To assess the potential of novel membrane materials for CO2/N2 separation in m-DAC.
• To identify research gaps and outline future prospects for m-DAC implementation.

Main Methods:

• Review of existing literature on m-DAC processes and membrane technologies.
• Analysis of simulation and laboratory studies demonstrating m-DAC feasibility.
• Evaluation of membrane performance for CO2/N2 separation at low concentrations.

Main Results:

• Membrane gas separation is a feasible technology for DAC, offering higher energy efficiency and scalability.
• Development of high-performance membranes and multistage processes are critical for efficient m-DAC.
• Current m-DAC applications are limited by low CO2 concentrations in ambient air.

Conclusions:

• Membrane-based direct air capture (m-DAC) is a promising strategy for atmospheric CO2 reduction.
• Continued research into advanced membrane materials and process design is essential for overcoming current limitations.
• A roadmap for future m-DAC development is proposed to facilitate its wider adoption.