Geopolymer-based inorganic membrane loaded with carbonic anhydrase for CO2 capture
To study the effect of porous materials on the performance of enzyme immobilization,we proposed a novel strategy for enzyme immobilization using a geopolymer tubular inorganic membrane(GM)as a carrier.Carbonic anhydrase(CA)was successfully loaded into this mesoporous membrane using glutaraldehyde(GA)cross-linking,relying on the large number of silica hydroxyl and aluminum hydroxyl structures naturally present in the membrane's mesopores.The results of the immobilization experiments show that the immobilized enzyme composite membrane(GM-CA)achieves 63.7％enzyme recovery.In stability tests,the membrane retained 67.8％relative activity after 30 consecutive uses and 52.0％relative activity after 60 days of storage at 4 ℃.In the CO2 capture assay,the CO2 capture efficiency developed 5.6 times under the catalytic of GM-CA.
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