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J. Chim. Phys.
Volume 96, Number 3, March 1999
Page(s) 455 - 463
DOI: 10.1051/jcp:1999152

J. Chim. Phys. Vol. 96, N°3  p. 455-463

Removal of Chromate Ions from Water by Anionicc CLAYS

B. Houri1, A. Legrouri2, A. Barroug1, C. Forano3 and J.-P. Besse3

1  School of Science & Engineering, Al Akhawayn University, P.O. Box 1871, Ifrane 53000, Morocco
2  Laboratoire de Chimie Physique, Faculté des Sciences Semlalia, Université Cadi Ayyad, B.P. 2390, Marrakech 40001, Morocco
3  Laboratoire des Matériaux Inorganiques, UPRES-A 6002, Université Blaise Pascal (Clermont-Ferrand II), 63177 Aubière-Cedex, France

The removal of chromate ions from aqueous solutions by [Mg-Al-Cl], [Zn-Al-Cl] and [Zn-Cr-Cl] anionic clays was investigated. The solids, prepared by coprecipitation at constant pH, were found to be pure upon characterisation by X-ray diffraction and Fourier-transform infrared spectroscopy. The interaction of the solid materials with CrO 42- ions has been studied by UV-visible spectroscopy. The treatment of solutions containing 15 to 300 ppm of CrO 42- was successful. The sorption capacities of the anionic clays for the CrO 42- ions are close to 1 mmol/g.

L'élimination des ions chromate de solutions aqueuses par les argiles anioniques [Mg-Al-Cl], [Zn-Al-Cl] et [Zn-Cr-Cl] a été étudiée. Les solides, préparés par coprécipitation à pH constant, ont été caractérisés par diffraction des rayons X et spectroscopie infrarouge à transformée de Fourier. L'interaction de ces matériaux avec les ions CrO 42- a été suivie par spectroscopie UV-visible. Le traitement de solutions contenant de 15 à 300 ppm de CrO 42- a donné de bons résultats. La capacité d'élimination de ces argiles anioniques pour les ions CrO 42- est d'environ 1 mmol/g. .

Key words: Anionic clay, layered double hydroxide, ion exchange, chromate, water treatment

© EDP Sciences 1999

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