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Carbonic Anhydrase@ZIF-8 Hydrogel Composite Membrane with Improved Recycling and Stability for Efficient CO₂ Capture

Ren, Sizhu, Li, Conghai, Tan, Zhilei, Hou, Ying, Jia, Shiru, Cui, Jiandong
Journal of agricultural and food chemistry 2019 v.67 no.12 pp. 3372-3379
asymmetric membranes, calcium carbonate, carbon dioxide, carbon sequestration, carbonate dehydratase, coordination polymers, coprecipitation, hydrogels, nanocomposites, polyvinyl alcohol, strength (mechanics), temperature
In this study, carbonic anhydrase (CA, EC molecules were embedded into metal–organic frameworks (MOFs) via co-precipitation (CA@ZIF-8), and then these CA@ZIF-8 nanocomposites were encapsulated in the poly(vinyl alcohol) (PVA)–chitosan (CS) hydrogel networks to prepare CA@ZIF-8–PVA–CS composite hydrogels (PVA/CS/CA@ZIF-8) with high activity, stability, and reusability. The immobilization efficiency of CA was greater than 70%, suggesting the high immobilization efficiency. The prepared PVA/CS/CA@ZIF-8 composite membranes displayed excellent higher stability against a high temperature, denaturants, and acid than free CA and CA@ZIF-8. Furthermore, these membranes exhibited an excellent performance for CO₂ capture. The amount of calcium carbonate obtained by PVA/CS/CA@ZIF-8 hydrogel membranes was 20- and 1.63-fold than free CA and CA@ZIF-8 composites, respectively. Furthermore, the hydrogel membranes exhibited superior reusability and mechanical strength. The hydrogel membrane maitained 50% of its original activity after 11 cycles. However, CA@ZIF-8 completely lost activity. These results indicated that the PVA/CS/CA@ZIF-8 membranes can be efficiently applied to capture CO₂ sequestration.