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

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( )} 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 anions are adsorbed on the FeOOH surface and GR( ) 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( )}. Like other layered double hydroxides, green rusts obey the general chemical formula with . 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( ) crystals (~500 nm).
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Submitted on : Wednesday, December 12, 2018 - 3:51:34 PM
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Christian Ruby, Rabha Aissa, Antoine Géhin, Jérôme Cortot, Mustapha Abdelmoula, et al.. Green rusts synthesis by coprecipitation of FeII–FeIII ions and mass-balance diagram. Comptes Rendus Géoscience, Elsevier Masson, 2006, 338 (6-7), pp.420-432. ⟨10.1016/j.crte.2006.04.008⟩. ⟨hal-01953056⟩

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