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2001•Acta Agronomica HungaricaRequires access

APPLICATION OF A FOUR-LAYER MODEL TO DESCRIBE HEMATITE, KAOLINITE AND KAOLINITE-HEMATITE SYSTEM (K-H) SURFACES

Maria Doula, A. Ioannou, A. Dimirkou, György Füleky

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Abstract

The surface charges on hematite, kaolinite and on kaolinite coated with hematite (kaolinite-hematite system) were measured and successfully described using the model (Four-Layer Model) developed by Bowden and co-workers (1977; 1980a; 1980b). The surface charge was also calculated theoretically, according to a computer program developed by Barrow (1987). Significant differences were pointed out for the surface properties of the three solids examined. Anion-specific adsorption was observed for hematite and kaolinite-hematite, and cation adsorption for kaolinite.

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The surface charges on hematite, kaolinite and on kaolinite coated with hematite (kaolinite-hematite system) were measured and successfully described using the model (Four-Layer Model) developed by Bowden and co-workers (1977; 1980a; 1980b). The surface charge was also calculated theoretically, according to a computer program developed by Barrow (1987). Significant differences were pointed out for the surface properties of the three solids examined. Anion-specific adsorption was observed for hematite and kaolinite-hematite, and cation adsorption for kaolinite.

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Available abstract

The surface charges on hematite, kaolinite and on kaolinite coated with hematite (kaolinite-hematite system) were measured and successfully described using the model (Four-Layer Model) developed by Bowden and co-workers (1977; 1980a; 1980b). The surface charge was also calculated theoretically, according to a computer program developed by Barrow (1987). Significant differences were pointed out for the surface properties of the three solids examined. Anion-specific adsorption was observed for hematite and kaolinite-hematite, and cation adsorption for kaolinite.

Key concepts: Hematite, Kaolinite, Adsorption, Mineralogy, Chemistry, Chemical engineering, Materials science, Inorganic chemistry

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