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

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  2. Phil Renforth
  3. Professor David Manning
Author(s)Renforth P, Manning DAC
Publication type Article
JournalInternational Journal of Greenhouse Gas Control
ISSN (print)1750-5836
Full text is available for this publication:
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.
PublisherElsevier Ltd
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