Kinetic, Thermodynamic Study of Phenol Red Dye Adsorption Using CuO-PVC nanocomposite

Abstract

The PVC-CuO nanocomposite has been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). it served as an adsorbent for the adsorption of phenol red. The influence of several parameters, the adsorbent eliminated 94.47% of phenol red under optimal conditions: adsorbent dose of 0.01 g, contact time of 45 minutes, starting concentration of 50 mg/L, temperature of 298 K (25°C), and pH of 7. experimental data was matched by the pseudo second-order kinetics. The free energy values at temperatures of 293, 298, 303, and 313 K were determined to be -2.289, -2.452, -3.0154 kJ/mole, respectively. negative free energy values signify that the adsorption of phenol red is spontaneous. The results for enthalpy and entropy change were 42.235 kJ/mole and 61.342 kJ/mole, respectively. Adsorption process was endothermic due to the positive enthalpy value. Adsorption exhibited an increase in randomness at the PVC-CuO nanocomposite-phenol interface, as indicated by the positive value of the entropy change obtained.