“Facial synthesis of layered double hydroxide intercalated with some organic precursors for the treatment of polluted water”

Abstract

Chemical modification of layered double hydroxide Mg-Cu-Al (LDH) to obtain its modified form using 3-amino1H-1,2,4-triazole (MLDH) Mg-Cu-Al during its synthesis by co-precipitation method. The fabricated LDH and their modified form were established using XRD, FTIR, XPS, TEM, SEM and BET N2-adsorption-desorption techniques. The prepared LDH and MLDH were evaluated as efficient adsorbents during the remediation of copper and cadmium ionic species in the solution medium. The variables of the adsorption process including the mass of used adsorbents, the acidity of the medium, and concentration of ionic species in the medium, temperature, and process time were examined. The results were used to optimize the adsorption process efficiency of both metal ions. By using MLDH the adsorption capacity of LDH for Cu2+ and Cd2+ was raised from 593 mg/g and 326 mg/g to 639 mg/g and 457 mg/g, respectively. The isotherm model of the adsorption path was followed up by the Freundlich isotherm and the kinetic model was followed by the pseudo-second-order model.

Keywords: Heavy metal removal, layered double hydroxide, 1,2,4-triazole, Freundlich adsorption isotherm, kinetics, thermodynamics.