Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582615 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
Layered double hydroxides (LDHs) calcined, denoted as CLDHs, have been shown to recover their original layered structure in the presence of appropriate anions. In the light of this so-called “memory effect”, the removal of indigo carmine (IC), an anionic dye, from aqueous solution by calcined Mg-Al-CO3 LDHs was investigated in batch mode. We looked at the influence of pH values, dye-adsorbent contact time, initial dye concentration and various temperatures of heating of LDHs on the decolorization rate of IC. The adsorption isotherms, described by Freundlich model are L-type. The characterization of the solids CLDHs, both fresh and after removal of IC, by X-ray diffraction and infrared spectroscopy shows that the IC adsorption on CLDHs is enhanced by reconstruction of a matrix hydrotalcite intercaled by the dye, and the intercalation of the organic ion was clearly evidenced by the net increase in the basal spacing from 0.76Â nm for [Mg-Al-CO3] to 2.13Â nm for the organic derivative.
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Authors
L. El Gaini, M. Lakraimi, E. Sebbar, A. Meghea, M. Bakasse,