Ultra-thin enzymatic liquid membrane for CO₂ separation and capture

Area of Science:

• Materials Science
• Chemical Engineering
• Biotechnology

Background:

• Current carbon dioxide (CO2) separation technologies face limitations in flux, selectivity, and cost.
• Absorption-based CO2 sequestration is expensive and energy-intensive.
• There is a critical need for advanced CO2 capture and separation methods.

Purpose of the Study:

• To develop an efficient, cost-effective, and scalable CO2 separation membrane.
• To leverage biomimetic design and enzymatic catalysis for enhanced CO2 capture.
• To overcome the limitations of existing CO2 separation technologies.

Main Methods:

• Fabrication of an ultra-thin, biomimetic membrane with precisely sized hydrophilic nanopores (~8 nm diameter).
• Incorporation and stabilization of the metalloenzyme carbonic anhydrase (CA) within the nanopore structure.
• Characterization of membrane performance for CO2 capture and separation under ambient conditions.

Main Results:

• The membrane achieved a CO2 flux of 2600 GPU.
• High selectivities were observed: CO2/N2 selectivity up to 788 and CO2/H2 selectivity up to 1500.
• The enzymatic liquid membrane demonstrated superior performance at room temperature and atmospheric pressure.

Conclusions:

• The developed enzymatic membrane offers a promising alternative for CO2 capture and separation.
• The biomimetic approach significantly enhances CO2 separation efficiency and selectivity.
• This technology represents a breakthrough for ambient condition CO2 separation applications.