Development and application of poly(ionic liquid) composite membranes with immobilized carbonic anhydrase for CO2 absorption in gas-liquid membrane contactors
(2023)
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- Authors
- Supervisors
- Luis Alconero, Patricia
- Abstract
- In the current climate crisis, CO2 capture and utilization appears to be essential in achieving the climate targets. Among the alternatives, CO2 can be utilized as sodium bicarbonate salts, NaHCO3. This product is obtained by absorbing CO2 into Na2CO3 aqueous solutions, which are kinetically limited solvents. Nevertheless, adding promoters such as the biocatalyst carbonic anhydrase can enhance their absorption rate. The enzyme is exceptionally active and can work in mild conditions. However, enzymes are homogenous catalysts with limited stability. This issue can be addressed through enzyme immobilization on a support. Thus, gas-liquid membrane contactors with carbonic anhydrase immobilized on the membrane surface are a promising technology for accelerating the absorption of CO2. This work's novelty comes from employing ionic liquid-derived materials, mainly polymerized ionic liquids or poly(ionic liquid)s, a class of tunable CO2-philic polymers, to anchor the enzyme to the membrane surface. Different immobilization approaches were compared: entrapment, physical adsorption, and covalent bonding. The most promising results were obtained with the physical adsorption of carbonic anhydrase on hydrophilic poly(ionic liquid)s. Overall, the materials developed during this Ph.D. thesis displayed interesting performance for their application in CO2 capture and utilization.
- Affiliations
Citations
Molina Fernandez, C. (2023). Development and application of poly(ionic liquid) composite membranes with immobilized carbonic anhydrase for CO2 absorption in gas-liquid membrane contactors. https://hdl.handle.net/2078.5/100156