Abstract
Immobilized carbonic anhydrase (CA, EC4.2.1.1) for CO2 capture has been intensively investigated. Unfortunately, the immobilized CA usually shows low CO2 capture efficiency due to lack of CO2 capture function for the conventional CA supports. In this study, an acid-resistant metal-organic framework MOF-808 was first modified by co-deposition of PEI (polyethyleneimine) and PDA (polydopamine) (PEI/PDA-MOF-808). Subsequently, the PEI/PDA-MOF-808 with a large number of amino groups was used as the strengthening material of CO2 capture to immobilize CA (CA@PEI/PDA-MOF-808). The resultant CA@PEI/PDA-MOF-808 showed a considerably improved CO2 capture capacity compared with free CA and PEI/PDA-MOF-808. The amount of CaCO3 produced by CA@PEI/PDA-MOF-808 was 11.0-fold and 2.5-fold higher than free CA and PEI/PDA-MOF-808, respectively. After 8 consecutive rounds of CO2 conversion, the total production of CaCO3 by CA@PEI/PDA-MOF-808 was 92-fold higher than free CA, reaching 294.0 mg. Furthermore, CA@PEI/PDA-MOF-808 displayed high thermostability, pH stability, storage stability, and reusability compared with free counterpart. After 1 h treatment at pH 3.0, CA@PEI/PDA-MOF-808 preserved 53.6% of its original activity while free CA was almost inactivated. In conclusion, this work provides a promising strategy for enzymatic CO2 conversion.
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