Accelerating Mineral Carbonation Using Carbonic Anhydrase

Environmental Science & Technology
Ian M PowerGregory M Dipple

Abstract

Carbonic anhydrase (CA) enzymes have gained considerable attention for their potential use in carbon dioxide (CO2) capture technologies because they are able to catalyze rapidly the interconversion of aqueous CO2 and bicarbonate. However, there are challenges for widespread implementation including the need to develop mineralization process routes for permanent carbon storage. Mineral carbonation of highly reactive feedstocks may be limited by the supply rate of CO2. This rate limitation can be directly addressed by incorporating enzyme-catalyzed CO2 hydration. This study examined the effects of bovine carbonic anhydrase (BCA) and CO2-rich gas streams on the carbonation rate of brucite [Mg(OH)2], a highly reactive mineral. Alkaline brucite slurries were amended with BCA and supplied with 10% CO2 gas while aqueous chemistry and solids were monitored throughout the experiments (hours to days). In comparison to controls, brucite carbonation using BCA was accelerated by up to 240%. Nesquehonite [MgCO3·3H2O] precipitation limited the accumulation of hydrated CO2 species, apparently preventing BCA from catalyzing the dehydration reaction. Geochemical models reproduce observed reaction progress in all experiments, revealing a linear c...Continue Reading

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Citations

Jul 6, 2017·Environmental Science & Technology·Shihan Zhang, Yongqi Lu
Sep 28, 2018·World Journal of Microbiology & Biotechnology·Makoto Yoshimoto, Peter Walde
Sep 24, 2019·Biotechnology and Bioengineering·Byung Hoon JoHyung Joon Cha
Nov 13, 2020·Scientific Reports·Haixia ChiYouming Zhang
Jun 6, 2021·The Science of the Total Environment·Prachi SinghDatta Madamwar
Jun 29, 2021·ACS Omega·Masahiro AbeAkihiro Yamasaki
Jul 9, 2021·Environmental Science & Technology·Ian M PowerRobert Caldwell
Jun 7, 2018·Environmental Science & Technology·Quin R S MillerBernard P McGrail

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