The Synthesis of Green Rust II(FeIII1–FeII2) and Its Spontaneous Transformation into Fe3O4
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Abstract Conditions for the synthesis of a pure green rust II with a definite chemical composition and its transformation reaction to Fe3O4 under a nitrogen atmosphere were studied. A pure green rust II with the composition of (Fe3+)1(Fe2+)2(SO42−)(OH−)5−2n(O2−)n was obtained by the air oxidation of an aqueous solution containing (0.05 mol dm−3) FeII and (0.3 mol dm−3) SO42− ions at pH 6.8 and 25 °C. This iron composition differs from those estimated previously; therefore, the green rust II synthesized here is designated as green rust II(FeIII1–FeII2). This green rust II is spontaneously transformed into Fe3O4 under a nitrogen atmosphere at 50–75 °C. It has been accepted that green rust II is transformed to Fe3O4 by oxidation. The above evidence suggests that the green rust II can be transformed into Fe3O4 not only by oxidation but also spontaneously without oxidants.
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Ferrous iron sorption to Fe(III)-silica particles may have given rise to 'green rust'-type deposits that eventually transformed into magnetite or iron silicates.
“Ferrous iron sorption to those particles may also have given rise to 'green rust'-type deposits that eventually transformed into magnetite or iron silicates (Tamaura et al., 1984; Zegeye et al., 2012; Halevy et al., 2017).”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Tamaura et al., 1984
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Fredrickson, J. K., Zachara, J. M., Kennedy, D. W., Dong, H., Onstott, T. C., Hinman, N. W., & Li, S.-M. (1998) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(98)00243-9 · Cited by 807 · see citing works
Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history
Konhauser, K. O., Planavsky, N. J., Hardisty, D. S., Robbins, L. J., Warchola, T. J., Haugaard, R., Lalonde, S. V., Partin, C. A., Oonk, P. B. H., Tsikos, H., et al. (2017) · Earth-Science Reviews · doi:10.1016/j.earscirev.2017.06.012 · Cited by 537 · see citing works
Morris, R. C. (1993) · Precambrian Research · doi:10.1016/0301-9268(93)90051-3 · Cited by 306 · see citing works
- Authors
- Tamaura, Y., Yoshida, T., & Katsura, T.
- Affiliations
- Tokyo Institute of Technology (JP)
- NEC (Japan) (JP)
- ORCID
- Yoshida, Takashi
- Venue
- Bulletin of the Chemical Society of Japan
- Publisher
- Oxford University Press (OUP)
- Published
- 1984-09-01
- Volume
- 57
- Issue
- 9
- Pages
- 2411-2416
- ISSN
- 0009-2673 (ISSN-L)
- 1348-0634
- OpenAlex
- W2065547146
- Cited by
- 63
- References
- 13
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2017: 1 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 2
- FWCI
- 2.55
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Bulletin of the Chemical Society of Japan (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Iron oxide chemistry and applications
- Physical Sciences › Materials Science › Materials Chemistry › Layered Double Hydroxides Synthesis and Applications
- Physical Sciences › Materials Science › Materials Chemistry › Magnetic Properties and Synthesis of Ferrites
- Keywords
- magnetite, iron oxyhydroxide, air oxidation, spontaneous transformation, nitrogen atmosphere, iron sulfate solution
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