Temperature dependence of amorphous magnesium carbonate structure studied by PDF and XAFS analyses

Mineral trapping through the precipitation of carbonate minerals is a potential approach to reduce CO 2 accumulation in the atmosphere. The temperature dependence of amorphous magnesium carbonate (AMC), a precursor of crystalline magnesium carbonate hydrates, was investigated using synchrotron X-ray...

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Veröffentlicht in:Scientific reports 2021-11, Vol.11 (1), p.22876-22876, Article 22876
Hauptverfasser: Yamamoto, Gen-ichiro, Kyono, Atsushi, Okada, Satoru
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Sprache:eng
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Zusammenfassung:Mineral trapping through the precipitation of carbonate minerals is a potential approach to reduce CO 2 accumulation in the atmosphere. The temperature dependence of amorphous magnesium carbonate (AMC), a precursor of crystalline magnesium carbonate hydrates, was investigated using synchrotron X-ray scattering experiments with atomic pair distribution function (PDF) and X-ray absorption fine structure analysis. PDF analysis revealed that there were no substantial structural differences among the AMC samples synthesized at 20, 60, and 80 °C. In addition, the medium-range order of all three AMC samples was very similar to that of hydromagnesite. Stirring in aqueous solution at room temperature caused the AMC sample to hydrate immediately and form a three-dimensional hydrogen-bonding network. Consequently, it crystallized with the long-range structural order of nesquehonite. The Mg K-edge X-ray absorption near-edge structure spectrum of AMC prepared at 20 °C was very similar to that of nesquehonite, implying that the electronic structure and coordination geometry of Mg atoms in AMC synthesized at 20 °C are highly similar to those in nesquehonite. Therefore, the short-range order (coordination environment) around the Mg atoms was slightly modified with temperature, but the medium-range order of AMC remained unchanged between 20 and 80 °C.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-02261-8