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Influence of Synthesis pH on Kaolinite “Crystallinity” and Surface Properties

Published online by Cambridge University Press:  28 February 2024

Claire-Isabelle Fialips ,
Sabine Petit ,
Alain Decarreau  and
Daniel Beaufort
Claire-Isabelle Fialips
Affiliation:
Laboratoire Hydr’ ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
Sabine Petit
Affiliation:
Laboratoire Hydr’ ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
Alain Decarreau
Affiliation:
Laboratoire Hydr’ ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
Daniel Beaufort
Affiliation:
Laboratoire Hydr’ ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
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Abstract

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Hydrothermal syntheses were performed at various pH values and temperatures to induce variability in kaolinite defect density. Temperature of synthesis ranged from 200 to 240°C, for 21 d. Initial pH at room temperature ranged from 0.5 to 14. The starting material was a hydrothermally treated gel, with an atomic Si/Al ratio of 0.93, partly transformed into kaolinite.

Kaolinite was obtained for a wide range of pH. Although no influence of temperature on “crystallinity” (i.e., defect density) was observed, the effect of pH was important. A continuous series was obtained from a low-defect kaolinite, with high thermal stability and a hexagonal morphology for the most acidic final pH, to a high-defect kaolinite, with low thermal stability and lath shape for the most basic final pH. These variations of kaolinite properties appear related to the pH dependence of kaolinite surface speciation. Increasing pH value results in increased cation adsorption on the kaolinite external surfaces and increases in the elongation of particles.

Keywords

Defect DensityFTIRHydrothermal SynthesisKaolinitepHSurface SpeciationXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 2 , April 2000 , pp. 173 - 184
Copyright
Copyright © 2000, The Clay Minerals Society

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