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Réactivité aux échelles micronique et submicronique de particules colloïdales : oxydation d'un sulfure de fer (pyrite) par du chrome (VI) et sorption sur un hydroxyde d'aluminium (gibbsite) d'espèces organiques

Abstract : Two systems characterised by oxydoreduction and sorption of surface reactions are studied: the pyrite oxidation (FeS2) by chromium (VI) and the sorption of dinitro-2,4 benzoic species on gibbsite (g-Al(OH)3). The aim of the first system is to study the pyrite oxidation processes of the pyrite by using chromium (VI) like a metal probe. The solution analysis by UV-visible spectroscopy and the solid phase characterisation by confocal Raman spectrometry, XPS, EXAFS and XANES allow to suggest a mechanism model of oxidation/dissolution. The objective of the second study is to display a specific chemical reactivity between two crystalline face types of the gibbsite by using an organic probe with the help of sub-wavelength spectroscopy (SNOM). Correlations between crystalline faces and near field spectra show difference reactivity between mono and bi coordinated OH groups from the mineral phase. A model of sorption is presented.
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Frédéric Demoisson. Réactivité aux échelles micronique et submicronique de particules colloïdales : oxydation d'un sulfure de fer (pyrite) par du chrome (VI) et sorption sur un hydroxyde d'aluminium (gibbsite) d'espèces organiques. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10004⟩. ⟨tel-01748068⟩

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