Hydrated magnesium carbonates derived from brucite: Structural and vibrational analysis via synchrotron XRD and Raman spectroscopy
This study explores the formation of hydrated magnesium carbonates (HMCs) cement via the carbonation of brucite [Image 1] using sodium bicarbonate [Image 2] as a carbon source. Employing synchrotron radiation X-ray diffraction (SRXRD) and time-gated Raman spectroscopy (tgRS), we investigate the HMCs...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025021814 |
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| Summary: | This study explores the formation of hydrated magnesium carbonates (HMCs) cement via the carbonation of brucite [Image 1] using sodium bicarbonate [Image 2] as a carbon source. Employing synchrotron radiation X-ray diffraction (SRXRD) and time-gated Raman spectroscopy (tgRS), we investigate the HMCs formation and their conversion in pure aqueous solution and solutions containing 1 M magnesium acetate (MgAc, Image 3). While previous studies have established the influence of reaction time and MgAc ligands on HMC formation, we present deeper insights into the role of sodium (Na) and MgAc in this system. Notably, eitelite [Image 4], a Na-containing carbonated phase, was detected after 7 and 28 days of carbonation in water [Image 5] but was absent when MgAc was present in the solution, revealing a key role of MgAc on phase selection. Additionally, acetate actively involves into the formation of an organo-modified HMC, identified as acetate-containing giorgiosite (ACG, Image 6), form through the conversion of nesquehonite [Image 7]. This phase was detected just 1 day into the reaction - significantly earlier than previously reported crystallization times. As the reaction time progressed, nesquehonite gradually converted into ACG in the presence of MgAc, and into eitelite in the absence of MgAc. These findings underscore the complementary strengths of SRXRD and tgRS in elucidating HMC formation and conversion pathways - SRXRD can tracks early-stage carbonation products, while tgRS provides molecular-level insights. Together, these techniques not only validate prior studies but also reveal additional mechanistic details governing HMC cement formation. |
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| ISSN: | 2590-1230 |