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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 18.104.22.168) 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.