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Laboratory carbonation of artificial silicate gels enhanced by citrate: Implications for engineered pedogenic carbonate formation

Lookup NU author(s): Phil Renforth, Professor David Manning

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Abstract

Carbon dioxide sequestration through carbonation of calcium or magnesium-rich silicate materials is a geoengineering technology that could mitigate a substantial proportion of anthropogenic emissions. Contemporary mineral carbonation research considers optimising this process to overcome energy requirements for mineral pre-treatment and reactor operation. This paper compliments previous studies in this area by demonstrating enhanced weathering through the action of organic acids including those exuded by plant roots. Batch weathering experiments, conducted as part of this study, with hydrated cement gels have shown that up to 80-85 % of calcium is leached from the material in 5 hours when exposed to solutions containing citrate anions, at an approximate log weathering rate between -8.26 to -6.86 molCa cm-2 sec-1, which is much more rapid than observed carbonate precipitation rates in previous studies for urban soils that contain cement-derived minerals. Thus Ca availability is not rate limiting. Coupled silicate-dissolution/carbonate precipitation reactions provide a carbon sequestration function that can be designed into soils specifically engineered to facilitate carbon capture.


Publication metadata

Author(s): Renforth P, Manning DAC

Publication type: Article

Journal: International Journal of Greenhouse Gas Control

Year: 2011

Volume: 5

Issue: 6

Pages: 1578-1586

Print publication date: 01/11/2011

ISSN (print): 1750-5836

Publisher: Elsevier Ltd

URL: http://dx.doi.org/10.1016/j.ijggc.2011.09.001

DOI: 10.1016/j.ijggc.2011.09.001


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