AI Article Synopsis
- The study explores how adding hydrated minerals and rocks to the environment can help remove carbon dioxide (CO₂) from the atmosphere by increasing alkalinity and forming bicarbonate.
- It finds that while silicate minerals offer moderate alkalinity enhancement, volcanic rocks like basalt actually release CO₂ instead of capturing it.
- Ground cement and magnesium hydroxide (Mg(OH)₂) show significant potential in enhancing alkalinity and mineralizing CO₂, though cement waste has limitations due to variable composition and possible heavy metal contamination.
Article Abstract
Mineral and rock additions to the environment have been proposed as a pathway to remove atmospheric CO. This process occurs when hydrated minerals or rocks increase alkalinity, promoting the formation of bicarbonate. In this study, we evaluate the potential of commonly used hydrated rock and mineral powders to enhance alkalinity and react with both atmospheric and concentrated CO. Silicate minerals and rocks exhibit minimal reactivity with atmospheric CO and provide moderate alkalinity enhancement. Volcanic rocks like basalt were shown to release CO. Ground cement and Mg(OH), refined from CO-free ultramafic rock, significantly increase alkalinity and mineralize both atmospheric and concentrated CO. However, the effectiveness of cement waste is limit by its variable CaO content and potential heavy metal contributions. Overall, Mg(OH), derived from silicates, offers a promising pathway for the removal and storage of CO
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11579450 | PMC |
| http://dx.doi.org/10.1038/s42004-024-01361-6 | DOI Listing |
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