Freundlich and Langmuir adsorption isotherms and kinetics for the removal of Tartrazine from aqueous solutions using GO/Fe2O3 Nanocomposite

Tartrazine, a yellow menace, is widely being used in cosmetics, foodstuffs, medicines and textile. It is carcinogenic and also catalyzes allergic problems. In the present work the ability to remove Tartrazine from aqueous solutions has been studied using GO/Fe2O3 Nanocomposite, as adsorbent. Effects of pH, concentration of the dye, temperature and adsorbent dosage have been studied. Equilibrium isotherms for the adsorption of the dye were measured experimentally. Results were analyzed by the Freundlich and Langmuir equation at different temperatures and determined the characteristic parameters for each adsorption isotherm. The adsorption process has been found endothermic in nature and thermodynamic parameters, Gibb’s free energy ( ), change in enthalpy ( ) and change in entropy ( ) have been calculated. The paper also includes results on the kinetic measurements of adsorption of the dye GO/Fe2O3 Nanocomposite at different temperatures.