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Etude de la coprécipitation des cations Fe[exposant II] et Fe[exposant III] en milieu sulfaté : influence des ions phosphate et carbonate

Abstract : The coprecipitation of the ferrous FeII and ferric cations FeIII is studied in sulphated medium. The follows of the potential and the pH during the coprecipitations are coupled with the characterisation of the solid phases by X-rays diffraction and Mössbauer spectroscopy. The solid phases present during the coprecipitation are ferrous hydroxide Fe(OH)2, sulphated green rust FeII4 FeIII2 (OH)12 SO4 - 8H2O, magnetite Fe3O4, the goethite a-FeOOH and a ferric basic salt. A stoechiometric diagram of the solid compounds was plotted, and it becomes the appropriate tool of this study. We also studied influence of phosphate and carbonate anions on the coprecipitation. The carbonate ions replace the sulphate ions, in order to form the carbonate green rust FeII4 FeIII2 (OH)12 CO3 - 2H2O. In addition, in anoxic conditions, this green rust is transformed into a mixture of ferrous hydroxide and magnetite. We showed that phosphate ions stabilise carbonated green rust, by adsorption on the side faces of the crystallites.
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Submitted on : Thursday, March 29, 2018 - 10:39:34 AM
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  • HAL Id : tel-01746522, version 1

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Antoine Géhin. Etude de la coprécipitation des cations Fe[exposant II] et Fe[exposant III] en milieu sulfaté : influence des ions phosphate et carbonate. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10148⟩. ⟨tel-01746522⟩

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