Abstracts
Résumé
La sorption des ions chromate de solutions aqueuses sur une hydrotalcite de synthèse et sur son produit de calcination a été étudiée. L’interaction de ces matériaux avec les ions chromate montre que la cinétique de sorption est rapide et suit une expression de vitesse de sorption réversible du premier ordre. Les influences du pH, de la concentration en ions chromate de la solution et de la température ont été étudiées afin d’optimiser la sorption. Le traitement de solutions contenant de 10 à 200 mg L-1 de Cr(VI) a donné de bons résultats. Les capacités de sorption de ces matériaux sont 1,3 et 2,4 mmol g‑1 de Cr(VI), respectivement. L’étude de la réversibilité de la sorption des ions chromate indique qu’il est possible d’utiliser les hydrotalcites calcinées comme sorbants recyclables. Ceci suggère notamment que ces derniers pourraient constituer d’intéressants supports pour le piégeage d’ions chromate.
Mots clés:
- Traitement de l’eau,
- hydroxyde double lamellaire,
- hydrotalcite,
- sorption,
- chromate
Summary
The sorption of chromate ions from aqueous solutions onto a synthetic hydrotalcite and its calcination product was investigated. The interaction of these materials with chromate ions shows that the kinetics of sorption are fast and follow a first-order reversible model. The effects of pH, chromate ion concentration and temperature on the sorption were studied. Solutions containing from 10 to 200 mg L‑1 of Cr(VI) were successfully treated. The sorption capacities of these materials are approximately 1.3 and 2.4 mmol CrO42-, per g, for the hydrotalcite and its calcination product, respectively. The reversibility of the sorption of chromate ions suggests the possible use of the calcined hydrotalcites as recyclable sorbents, which may constitute useful supports for trapping chromate ions.
Key words:
- Water treatment,
- layered double hydroxide,
- hydrotalcite,
- sorption,
- chromate
Appendices
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