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Removal of indigo carmine dye from water to Mg-Al-CO(3)-calcined layered double hydroxides.

Journal of hazardous materials (2008-06-25)
L El Gaini, M Lakraimi, E Sebbar, A Meghea, M Bakasse
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-CO(3) 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 0.76 nm for [Mg-Al-CO(3)] to 2.13 nm for the organic derivative.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Indigo, synthetic, Dye content 95 %
Supelco
Indigo carmine, analytical standard
Sigma-Aldrich
Indigo carmine, certified by the Biological Stain Commission, Dye content 85 %
Sigma-Aldrich
Indigo carmine, for microscopy (Bact., Hist.), indicator (pH 11.5-14.0)