Direct Nanoscale Observations of CO2 Sequestration during Brucite [Mg(OH)2] Dissolution
Abstract
The dissolution and carbonation of brucite on (001) cleavage surfaces was investigated in a series of in situ and ex situ atomic force microscopy (AFM) experiments at varying pH (2-12), temperature (23-40 °C), aqueous NaHCO(3) concentration (10(-5)-1 M), and PCO(2) (0-1 atm). Dissolution rates increased with decreasing pH and increasing NaHCO(3) concentration. Simultaneously with dissolution of brucite, the growth of a Mg-carbonate phase (probably dypingite) was directly observed. In NaHCO(3) solutions (pH 7.2-9.3,), precipitation of Mg-carbonates was limited. Enhanced precipitation was, however, observed in acidified NaHCO(3) solutions (pH 5, DIC ≈ 25.5 mM) and in solutions that were equilibrated under a CO(2) atmosphere (pH 4, DIC ≈ 25.2 mM). Nucleation predominantly occurred in areas of high dissolution such as deep step edges suggesting that the carbonation reaction is locally diffusion-transport controlled. More extensive particle growth was also observed after ex situ experiments lasting for several hours. This AFM study contributes to an improved understanding of the mechanism of aqueous brucite carbonation at low temperature and pressure conditions and has implications for carbonation reactions in general.
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Carbonate precipitation rates decrease at higher temperatures despite hydroxide dissolution kinetics being positively proportional to temperature.
“Thus, carbonate precipitation rates decrease at higher temperatures despite hydroxide dissolution kinetics being positively proportional to temperature.57,58”
From Utilization of mineral carbonation products: current state and potential (2019) · cites this paper as [58]
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Self-citation
- Authors
- Hövelmann, J., Putnis, C. V., Ruiz-Agudo, E., & Austrheim, H.
- Affiliations
- University of Oslo (NO)
- University of Münster (DE)
- Department of Mineralogy and Petrology, University of Granada, 18071 Granada, Spain
- Corresponding author
- Hövelmann, J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-04-20
- Volume
- 46
- Issue
- 9
- Pages
- 5253-5260
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1979900636
- Cited by
- 121
- References
- 4
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 10 · 2023: 5 · 2022: 11 · 2021: 8 · 2020: 8 · 2019: 9 · 2018: 10 · 2017: 8 · 2016: 8 · 2015: 5 · 2014: 13 · 2013: 14 · 2012: 1
- FWCI
- 8.73
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- eSpace (Curtin University) (submittedVersion)
- Publication Database GFZ (GFZ German Research Centre for Geosciences) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Keywords
- CO2 sequestration, magnesium carbonate precipitation, dypingite, dissolution kinetics, pH effect, partial pressure of CO2, diffusion-controlled growth, in situ atomic force microscopy
- MeSH terms
- Carbon Dioxide, Carbonates, Magnesium Hydroxide, Chemical Precipitation, Microscopy, Atomic Force
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