Green rusts synthesis by coprecipitation of FeII-FeIII ions and mass-balance diagram

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Abstract

A basic solution is progressively added to various mixed FeII-FeIII solutions. The nature and the relative quantities of the compounds that form can be visualised in a mass-balance diagram. The formation of hydroxysulphate green rust {GR(SO42 -)} is preceded by the precipitation of a sulphated ferric basic salt that transforms in a badly ordered ferric oxyhydroxide. Then octahedrally coordinated FeII species and SO42 - anions are adsorbed on the FeOOH surface and GR(SO42 -) is formed at the solid/solution interface. By using the same method of preparation, other types of green rust were synthesised, e.g. hydroxycarbonate green rust {GR(CO32 -)}. Like other layered double hydroxides, green rusts obey the general chemical formula [MII(1 - x) MIIIx (OH)2]x - ṡ [(x / n) An - ṡ m H2 O]x + with x ≤ 1 / 3. Al-substituted hydroxysulphate green rust consists of small hexagonal crystals with a lateral size ∼50 nm, which is significantly smaller than the size of the GR(SO42 -) crystals (∼500 nm). To cite this article: C. Ruby et al., C. R. Geoscience 338 (2006). © 2006 Académie des sciences.

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Ruby, C., Aïssa, R., Géhin, A., Cortot, J., Abdelmoula, M., & Génin, J. M. (2006, June). Green rusts synthesis by coprecipitation of FeII-FeIII ions and mass-balance diagram. Comptes Rendus - Geoscience. https://doi.org/10.1016/j.crte.2006.04.008

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