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Article Dans Une Revue Corrosion Science Année : 2003

Coprecipitation thermodynamics of iron(II–III) hydroxysulphate green rust from Fe(II) and Fe(III) salts

Résumé

Iron(II–III) hydroxysulphate GR(SO42−) was prepared by precipitating a mixture of Fe(II) and Fe(III) sulphate solutions with NaOH, accompanied in most cases by iron(II) hydroxide, spinel iron oxide(s) or goethite. Its [Fe(II)]/[Fe(III)] ratio determined by transmission Mössbauer spectroscopy was 2±0.2, whatever the initial [Fe(II)]/[Fe(III)] ratio in solution. Proportion of Fe(OH)2 increased when the initial [Fe(II)]/[Fe(III)] ratio increased, whereas proportion of α-FeOOH or spinel oxide(s) increased when this ratio decreased. GR(SO42−) is metastable vs. Fe3O4 except in a limited domain around neutral pH. Precipitation from solutions containing both Fe(II) and Fe(III) dissolved species seems to favour GRs formation with respect to stable systems involving iron (oxyhydr)oxides.

Dates et versions

hal-01959509 , version 1 (18-12-2018)

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Citer

Ph Refait, A. Gehin, Mustapha Abdelmoula, J.-M.R. Génin. Coprecipitation thermodynamics of iron(II–III) hydroxysulphate green rust from Fe(II) and Fe(III) salts. Corrosion Science, 2003, 45 (4), pp.659-676. ⟨10.1016/S0010-938X(02)00138-5⟩. ⟨hal-01959509⟩
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