Abstract
Zinc complexes were synthesized as catalysts that mimic the ability of carbonic anhydrase (CA) for the CO2 hydration reaction (H2O + CO2 → H+ + HCO3−). For these complexes, a tris(2-pyridylmethyl)amine (TPA) ligand mimicking only the active site, and a 6-((bis(pyridin-2-ylmethyl)amino)methyl)pyridin-2-ol (TPA-OH) ligand mimicking the hydrogen-bonding network of the secondary coordination sphere of CA were used. Potentiometric pH titration was used to determine the deprotonation ability of the Zn complexes, and their pKa values were found to be 8.0 and 6.8, respectively. Stopped-flow spectrophotometry was used to confirm the CO2 hydration rate. The rate constants were measured to be 648.4 and 730.6 M−1s−1, respectively. The low pKa value was attributed to the hydrogen-bonding network of the secondary coordination sphere of the catalyst that mimics the behavior of CA, and this was found to increase the CO2 hydration rate of the catalyst.
Highlights
CO2, which is the main cause of global warming, is being actively studied so as to find more economical ways to capture and store this gas stably [1,2,3]
Mineral carbonation using carbonic anhydrase (CA) is being studied at length for its utilization in the biomineralization of CO2 in flue gas, and it has already been undertaken to demonstrate the feasibility of the process in some pilot-scale studies [14,15,16]
These results indicated that the introduction of hydroxyl groups donates a sufficient number of electrons to the Zn ions
Summary
CO2 , which is the main cause of global warming, is being actively studied so as to find more economical ways to capture and store this gas stably [1,2,3]. For capturing CO2 , amine-based chemosorbents, which are expected to be the first material to be commercialized, are currently under investigation [3,4,5,6,7]. These chemosorbents have certain drawbacks, in that they require a high amount of heat for regeneration, are corrosive, and undergo deterioration [8,9,10]. The biomimetic technology is a breakthrough, and it is a new concept rather than being an extension of the existing technology. Mineral carbonation using CA is being studied at length for its utilization in the biomineralization of CO2 in flue gas, and it has already been undertaken to demonstrate the feasibility of the process in some pilot-scale studies [14,15,16]
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