CO2 capture using membrane-based absorption : development of thin-film composite biocatalytic gas-liquid membrane contactor for CO2 capture
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- Capturing CO2 from fossil fuels, biogas and natural gas combustion remains a major challenge in many environmental and energy applications. The gas-liquid membrane contactor offers a promising alternative to the conventional packed column. A new biocatalytic liquid-gas membrane contactor for capturing CO2 with benign absorbent solvents was developed. Commercially available PVDF flat sheet membranes have been studied as substrates. The biocatalytic film consists of chitosan support with surface-immobilized carbonic anhydrase covalently bond via glutaraldehyde crosslinking. The immobilized enzyme proves to enhance the CO2 hydration efficiency. The biocatalytic membrane contactor performance was investigated in varying different parameters, such as the enzyme loading, the crosslinker concentration, and the enzyme incubation time. The maximum mass transfer coefficient obtained was 24.7*10^(-5) (m^3/ m²s) with an enzyme density of 209 (mg/m²), 2 wt.\% glutaraldehyde crosslinking agent, and 24h of incubation time. The CO2 absorption flux of 14.8*10^(-4) (mol/m²s) was obtained. Long-term experiments have also been carried and it showed that storing membranes at ambient air may quickly deteriorate membrane hydration performance.