Chemical stability of hydroxysulphate green rust synthetised in the presence of foreign anions: carbonate, phosphate and silicate

Abstract : Hydroxysulphate green rust GR(SO{4/2-}) species were precipitated in the presence of various anions. GR(SO{4/2-}) is stable at ˜pH 7 and is transformed into a mixture of magnetite and ferrous hydroxide when the pH raised at ˜12. In the presence of carbonate species, GR(SO{4/2-}) is partially transformed into a mixture of magnetite and siderite at ˜pH 8.5. This transformation is stopped when silicate anions are present in the solution. As already observed for phosphate anions, the adsorption of silicate anions on the lateral faces of the GR(SO{4/2-}) crystals may explain this stabilization effect. Sulphate anions are easily exchanged by carbonate species at ˜pH 10.5. In contrast, anionic exchange between sulphate and phosphate anions was not observed.
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C. Ruby, A. Géhin, R. Aissa, J. Ghanbaja, Mustapha Abdelmoula, et al.. Chemical stability of hydroxysulphate green rust synthetised in the presence of foreign anions: carbonate, phosphate and silicate. Hyperfine Interactions, Springer Verlag, 2006, ICAME 2005, 167 (1-3), pp.803-807. ⟨10.1007/978-3-540-49853-7_16⟩. ⟨hal-01945893⟩

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