There is a growing
concern that the increasing concentration
of
CO2 in the atmosphere contributes to a potential negative
impact on global climate change. To deal with this problem, developing
a set of innovative, practical technologies is essential. In the present
study, maximizing the CO2 utilization and precipitation
as CaCO3 was evaluated. In this manner, bovine carbonic
anhydrase (BCA) was embedded into the microporous zeolite imidazolate
framework, ZIF-8, via physical absorption and encapsulation.
Running as crystal seeds, these nanocomposites (enzyme-embedded MOFs)
were in situ grown on the cross-linked electrospun
polyvinyl alcohol (CPVA). The prepared composites displayed much higher
stability against denaturants, high temperatures, and acidic media
than free BCA, and BCA immobilized into or on ZIF-8. During 37 days
of storage period study, BCA@ZIF-8/CPVA and BCA/ZIF-8/CPVA maintained
more than 99 and 75% of their initial activity, respectively. The
composition of BCA@ZIF-8 and BCA/ZIF-8 with CPVA improved stability
for consecutive usage in recovery reactions, recycling easiness, and
greater control over the catalytic process. The amounts of calcium
carbonate obtained by one mg each of fresh BCA@ZIF-8/CPVA and BCA/ZIF-8/CPVA
were 55.45 and 49.15 mg, respectively. The precipitated calcium carbonate
by BCA@ZIF-8/CPVA reached 64.8% of the initial run, while this amount
was 43.6% for BCA/ZIF-8/CPVA after eight cycles. These results indicated
that the BCA@ZIF-8/CPVA and BCA/ZIF-8/CPVA fibers could be efficiently
applied to CO2 sequestration.
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