A comparative study of some kaolinites surface properties

Abstract : The surface properties of five kaolinites of various origins were analyzed using 10 potentiometric titration, electrokinetic measurements and low-pressure gas adsorption 11 associated to derivative isotherm summation (DIS) modeling. The data show that sample 12 structure is important in determining the surface properties. The combined analytical results 13 clearly shows the existence of a permanent negative layer charge for all the samples. The 14 general features that could be observed for the five kaolinites are: the titration curves are 15 shifted to lower pH with increasing ionic strength due to the layer charge; the amount of 16 consumed proton is influenced by the permanent layer charge; although low, the permanent 17 charge determines the electrokinetic behavior. The shape anisotropy and the charge 18 distribution on the basal and edge surfaces are crucial parameters to understand the behavior 19 of kaolinite particles in aqueous media. The Cameroonian sample of the set exhibits a 20 significant permanent charge together with large specific surface area associated to fine 21 particle size and considerable shape anisotropy. 22
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Submitted on : Friday, March 15, 2019 - 9:25:50 PM
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J.A. Mbey, F. Thomas, A. Razafitianamaharavo, C. Caillet, F. Villieras. A comparative study of some kaolinites surface properties. Applied Clay Science, Elsevier, 2019, 172, pp.135-145. ⟨10.1016/j.clay.2019.03.005⟩. ⟨hal-02069777⟩

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