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Carbonation Shrinkage01:24

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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Accelerating Mineral Carbonation Using Carbonic Anhydrase.

Ian M Power1, Anna L Harrison1, Gregory M Dipple1

  • 1Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia , 2020-2207 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada.

Environmental Science & Technology
|February 2, 2016
PubMed
Summary
This summary is machine-generated.

Adding bovine carbonic anhydrase (BCA) enzyme significantly accelerates mineral carbonation of brucite using CO2. This enzyme-catalyzed CO2 hydration enhances carbon capture rates, showing potential for more efficient carbon storage solutions.

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Area of Science:

  • Environmental Science and Engineering
  • Biocatalysis and Carbon Capture
  • Mineral Carbonation Technologies

Background:

  • Carbonic anhydrase (CA) enzymes accelerate the conversion of CO2 and bicarbonate, crucial for CO2 capture.
  • Mineral carbonation offers permanent CO2 storage but can be limited by CO2 supply rates.
  • Enzyme-catalyzed CO2 hydration presents a strategy to overcome CO2 supply limitations in mineral carbonation.

Purpose of the Study:

  • To investigate the impact of bovine carbonic anhydrase (BCA) on the carbonation rate of brucite.
  • To evaluate the effectiveness of BCA in enhancing CO2 capture through mineral carbonation.
  • To explore the potential for accelerating permanent carbon storage via enzyme-mediated processes.

Main Methods:

  • Experimental setup involved alkaline brucite slurries amended with BCA.
  • Slurries were exposed to CO2-rich gas streams (10% CO2).
  • Aqueous chemistry and solid phases were monitored over hours to days; geochemical modeling was employed.

Main Results:

  • Brucite carbonation rates were accelerated by up to 240% with BCA compared to controls.
  • Nesquehonite precipitation limited hydrated CO2 accumulation, potentially inhibiting BCA's dehydration catalysis.
  • Geochemical models confirmed a linear correlation between CO2 uptake and carbonation rate, limited by CO2 supply.

Conclusions:

  • Bovine carbonic anhydrase significantly enhances the rate of brucite mineral carbonation.
  • Enzyme-catalyzed CO2 hydration effectively addresses CO2 supply limitations in carbon capture.
  • Further acceleration of carbonation is possible, contingent on optimizing CO2 delivery to BCA-amended systems.