In
this study, carbonic anhydrase (CA, EC 4.2.1.1) 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.
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