Turkish Journal of Chemistry
Abstract
In the present study, calcined layered double hydroxides (CLDHs) were obtained by heating [Zn$_{2}$-Al-CO$_{3}$] at 500 $^{\circ}$C. The adsorption of the textile dye acid green 1 (AG1) by CLDH was carried out at different pH levels, adsorbent--adsorbate contact times, and AG1/CLDH mass ratios. Equilibrium at room temperature was reached after 24 h, which was confirmed by the kinetic modeling of the experimental data by the pseudo-second-order model. The adsorption is described by a Langmuir-type isotherm. The comparative study of adsorption isotherms in calcined and uncalcined phases reveals that the former could be a good candidate for trapping such pollutants. After removal of AG1, characterization of the CLDH solids by X-ray diffraction and infrared spectroscopy showed that the adsorption is also enhanced by reconstruction of a hydrotalcite matrix intercalated by AG1. The removal of AG1 by CLDH gave satisfactory results. Under optimum conditions, the retention is total when mass ratio AG1/CLDH is between 0.58 and 0.75. The material can be recycled by a series of anion exchange reactions and its retention capacity reaches 833.33 mg/g. This retention capacity was only reduced by 10% after the fifth recycling cycle.
DOI
10.3906/kim-1705-48
Keywords
Calcined layered double hydroxide, AG1 textile dye, adsorption, intercalation, reconstruction, recycling
First Page
1146
Last Page
1160
Recommended Citation
MOURID, E. H, LAKRAIMI, M, ABRIDI, S. E, BENAZIZ, L, ELKHATTABI, E. H, & BERRAHO, M (2018). Use of calcined layered double hydroxide [Zn$_{2}$-Al-CO$_{3}$] for removal of textile dye acid green 1 from wastewater: kinetic, equilibrium, comparative, and recycling studies. Turkish Journal of Chemistry 42 (4): 1146-1160. https://doi.org/10.3906/kim-1705-48
