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Bimetal based inorganic-carbonic anhydrase hybrid hydrogel membrane for CO2 capture

2020; Elsevier BV; Volume: 39; Linguagem: Inglês

10.1016/j.jcou.2020.101171

2212-9839

Huan Fei Wen, Lei Zhang, Yingjie Du, Ziyuan Wang, Yunhong Jiang, Hongjie Bian, Jiandong Cui, Shiru Jia,

Nanomaterials for catalytic reactions

In this study, we synthesized for the first time a bimetal-based inorganic-carbonic anhydrase (CA) hybrid nanoflower to immobilize CA using Cu2+ and Zn2+ 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/[email protected] 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/[email protected] 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/[email protected] 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/[email protected] 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.