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

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.

Enhanced sequestration of carbon dioxide into calcium carbonate using pressure and a carbonic anhydrase from alkaliphilic Coleofasciculus chthonoplastes

“…Enzyme‐enhanced CO 2 sequestration has been investigated in multiple manners: either by purifying and evaluating CAs from different origins [ 26 , 27 ] or by immobilizing CA to make it more resistant to harsh conditions [ 11 , 28 ]. Few studies dealt with the production of PCC under pressurized CO 2 .…”

A State‐of‐the‐Art Update on Integrated CO2 Capture and Electrochemical Conversion Systems

“…Wen et al synthetized a reusable membrane for converting CO 2 to bicarbonate based on a bimetal (Zn 2 + and Cu 2 + )-protein hybrid hydrogel. [51] This material presented a recovery activity of 70 % compared to analogous control experiments where the activity was 35 % (Zn-based support) and 10 % (Cu-based support). On the other hand, Jin et al developed a re-usable, stable, MOF with structural similarities to the Zn-coordination complex in CA to improve CO 2 absorption kinetics and proposed a model to convert CO 2 .…”

Combining Active Carbonic Anhydrase with Nanogels: Enzyme Protection and Zinc Sensing

“…Many attempts have been made to immobilize CA in various supports, including hydrogels, for the biocatalysis of the reversible conversion of CO 2 to bicarbonate. [35][36][37][38][39][40][41] Studies by Fierke and Thompson have demonstrated another unique application of CA, namely as a zinc biosensor, with advantages well-discussed in the literature. [25][26][27][28][29][30][31] Here we report, for the first time, a proof-of-concept study of combining active CA with nanogels.…”

“… 35 Immobilizing CA on various supports has been used to improve its stability and reusability for CO 2 capture, among which a few attempts have successfully immobilized CA in a hydrogel network. For example, CA-liposome conjugates 36 and metal-organic hybrid nanocomposites 37 , 38 have been reported to be embedded into hydrogel beads and membranes during the polymerization process. CA was also encapsulated in silk protein hydrogel via a dual crosslinking strategy, which employed a photoinduced dityrosine chemical crosslinking followed by a dehydration-mediated physical crosslinking.…”