Synthesis of MgZnAl Layered Triple Hydroxide Nanoplates as an Efficient Adsorbent for Removing the Acid Yellow 76 Azo Dye

Abstract

A simple hydrothermal method was employed for synthesizing MgZnAl layered triple hydroxide nanoplates (MgZnAl LTH) as an efficient adsorbent for removing the Acid Yellow 76 (AY76) azo dye. A batch process was used to perform adsorptions were and investigate the effects of experimental parameters including temperature, adsorbent dosage, solution pH. The best adsorption conditions obtained were pH of 4, MgZnAl LTH dosage of 20 mg and temperature of 55 °C. The kinetics of adsorption was studied using pseudo‐first‐order, pseudo‐second‐order, Elovich, and intraparticle diffusion models. To obtain equilibrium absorption data, Freundlich, Langmuir, and Temkin isotherms were utilized. The findings showed that the adsorption data based on the experiment had a good agreement with the Freundlich model. The highest capacity of adsorption equal to 277.8 mg/g was obtained for the MgZnAl LTH nanoplates toward AY76. Thermodynamic results showed that the process of adsorption of AY76 onto MgZnAl LTH nanoplates had a spontaneous and endothermic nature.