Adsorption, Kinetics and Equilibrium Studies on Removal of Reactive Black 5 from Aqueous Solutions Using ZnCo2O4 Nanospinel

In this paper, nanospinel ZnCo 2 O 4 was showed the excellent adsorption efficiency towards reactive black 5 (RB5) as a reactive dye in aqueous solution. The adsorption studies were carried out at different values of pH, contact time, adsorbent dosages, temperatures and dye concentrations. The investigation of removal kinetics of RB5 indicates that the removal process obeys the rate of second-order kinetic equation. The results indicate that the Langmuir adsorption isotherm fitted the data better than the Freundlich. Finally, the photocatalytic degradation of RB5 was examined. The results of experimental showed that the degradation of RB5 dye follows only an adsorption process.