ADSORPTION KINETICS AND THERMODYNAMICS OF REMOVAL OF BASIC DYES BY STISHOVITE CLAY - TiO2 NANOCOMPOSITE

A series of studies have been conducted on the removal of the basic dyes Auramine yellow and Auramine O using stishovite-TiO2 nanocomposite (NC) as an adsorbent. The batch adsorption experiments were conducted under various operating parameters like initial dye concentration, contact time, adsorbent dose, pH and temperature. The equilibrium data fitted well to the Langmuir and Freundlich isotherm equations. The adsorption efficiency, adsorption energy, adsorption capacity, intensity of adsorption and dimensionless separation factor all are calculated. The experimental data fitted very well with pseudo second order kinetic model and Elcovich model suggesting chemisorption which is confirmed by desorption studies. The adsorption also follows intraparticle diffusion model.