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Role of Iron Oxides in the Phosphate Adsorption Properties of Kaolinites From the Ivory Coast

Published online by Cambridge University Press:  01 January 2024

J. Sei ,
J. C. Jumas ,
J. Olivier-Fourcade ,
H. Quiquampoix  and
S. Staunton
J. Sei*
Affiliation:
LPMC Université Montpellier II, place E. Bataillon, C.C. 03, 34095 Montpellier Cedex 5, France Unité de Science du Sol, INRA, place P. Viala, 34060 Montpellier Cedex 1, France
J. C. Jumas*
Affiliation:
LPMC Université Montpellier II, place E. Bataillon, C.C. 03, 34095 Montpellier Cedex 5, France
J. Olivier-Fourcade*
Affiliation:
LPMC Université Montpellier II, place E. Bataillon, C.C. 03, 34095 Montpellier Cedex 5, France
H. Quiquampoix
Affiliation:
Unité de Science du Sol, INRA, place P. Viala, 34060 Montpellier Cedex 1, France
S. Staunton*
Affiliation:
Unité de Science du Sol, INRA, place P. Viala, 34060 Montpellier Cedex 1, France
*
†Present address: Laboratoire de Chimie Minérale, Université de Cocody, 22 BP 582, Abidjan 22, Ivoire Coast
‡Present address: LAMMI (UMR 5072), Université Montpellier II, Place E. Bataillon, C.C. 15, 34095 Montpellier Cedex 5, France
‡Present address: LAMMI (UMR 5072), Université Montpellier II, Place E. Bataillon, C.C. 15, 34095 Montpellier Cedex 5, France
*E-mail address of corresponding author: staunton@ensam.inra.fr
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Abstract

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The phosphate adsorption properties of three clay samples, with kaolinite as the dominant mineral, from different deposits in the Ivory Coast have been investigated. The clays contain varying amounts of crystalline Fe oxides and kaolinite with structural Fe. All measurements were made in dilute suspension under controlled conditions of temperature, pH, ionic strength and saturating cation. Data have been fitted to Langmuir adsorption isotherms. Both P adsorption and surface area measurements have been made on samples before and after chemical removal of Fe oxides. The samples have large P adsorption capacities, which are not entirely explained by their large specific surface areas. The presence of Fe oxides makes a strong contribution to the surface area and enhances the adsorption capacities. There is little evidence that structural Fe makes a strong contribution to the enhanced P adsorption capacity.

Keywords

AdsorptionFe OxideGoethiteHematiteKaoliniteLangmuirPhosphate
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 2 , April 2002 , pp. 217 - 222
Copyright
Copyright © 2002, The Clay Minerals Society

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