Elimination de polluant par une argile synthétique modifiée

Abstract

Water pollution caused by industrial dyes, particularly azo dyes, represents a major environmental challenge due to their chemical stability and potential toxicity. The present study aims to evaluate the adsorption performance of nickel-aluminum layered double hydroxides (NiAl-LDH) for the removal of Methyl Orange from aqueous solutions and to investigate the effect of calcination on the adsorbent properties. Adsorption experiments were carried out using non-calcined NiAl and samples calcined at 450 °C for 2 h, 4 h, and 6 h. Adsorption isotherm and kinetic studies were performed to assess the adsorption capacity and to better understand the adsorption mechanism. Fourier Transform Infrared Spectroscopy (FTIR) was employed to characterize the materials after adsorption and to identify the interactions occurring between the dye molecules and the adsorbent surface. The results demonstrated that NiAl materials exhibit a significant adsorption capacity toward Methyl Orange and that calcination considerably affects their adsorption behavior. The applied isotherm and kinetic models provided valuable information about the adsorption process and enabled the determination of the model that best fits the experimental data. These findings highlight the potential of NiAl layered double hydroxides as promising adsorbent materials for the treatment of dye- contaminated wastewater.