Bimetal based inorganic-carbonic anhydrase hybrid hydrogel membrane for CO2 capture. Issue 39 (July 2020)

• Record Type: Journal Article
• Authors: Wen, Huan; Zhang, Lei; Du, Yingjie; Wang, Ziyuan; Jiang, Yunhong; Bian, Hongjie; Cui, Jiandong; Jia, Shiru
• Is Part Of: Journal of CO₂ utilization. Issue 39(2020)
• Publication Date: 2020-07
• Subjects: Carbonic anhydrase -- Bimetallic-based protein hybrid -- Hydrogel membranes -- Immobilization -- CO2 sequestration; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2020.101171
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: A novel bimetal-based inorganic-protein hybrid was developed to immobilize carbonic anhydrase using Cu 2+ and Zn 2+ . Bimetal based inorganic-carbonic anhydrase hybrid hydrogel membrane was prepared. The PVA/CS@CANF membrane can be easily separated from reaction solution to reuse without centrifugation. The PVA/CS@CANF membrane exhibited superior capacity for hydration of CO2 to bicarbonate. Abstract: In this study, we synthesized for the first time a bimetal-based inorganic-carbonic anhydrase (CA) hybrid nanoflower to immobilize CA using Cu 2+ and Zn 2+ instead of single metal ion. Subsequently, the synthesized bimetallic hybrid nanoflowers (CANF) were embedded into the poly(vinyl alcohol) (PVA)-chitosan (CS) hydrogel networks to obtain PVA/CS@CANF hydrogel membrane. The CANF exhibited a significantly higher activity recovery of 70 % compared with 35 % with CA/Zn3 (PO4 )2 hybrid nanoflowers and 10 % with CA/Cu3 (PO4 )2 hybrid nanoflowers. The PVA/CS@CANF hydrogel membrane possessed excellent mechanical strength, high catalytic activity, and were easy to flow out without centrifugation or filtration. At the same time, the PVA/CS@CANF displayed higher thermostability, storage stability, and pH stability than free CA and CANF, and superior reusability and CO2 capture capacity. The hydrogel membrane maintained more than 75 % of its original activity after 8 cycles. However, CANF only maintained 12 % of its original activity. Furthermore, the amount of CaCO3 produced by PVA/CS@CANF membrane was 9.0-fold and 2.0-fold compared with free CA and CANF, respectively. Therefore, This approach to synthesizing bimetallic-based protein hybrid hydrogel membrane could have a bright future in CO2 capture.