Abstract

Layered double hydroxides (LDHs) and mixed oxides derived from its calcination have been reported in the literature as promising adsorbent materials in the remediation of several environmental pollutants. Due to their physicochemical properties, adsorption capacity and simple thermal regeneration procedure, these materials are interesting alternatives to conventional adsorbents. In this context, this study presents the synthesis, characterization and the results obtained with calcined LDHof CuZnAl for the colour removal in water of Acid Red 357, an anionic dye used in leather dyeing. The solid was synthesised by the co-precipitation method and characterised by N2 physisorption, Xray diffractometry and Fourier transform infrared spectroscopy. The influence of contact time on the adsorption process, adsorbent dosage and the memory effect of the mixed oxide were evaluated. The results showed an 80% removal percentage for counting times over 90 minutes and the ability of the adsorbent to reconstruct the lamellar structure after adsorption.