Influencing the Artificial UV-A light on decolorization of Chlorazol black BH Dye via using bulk ZnO Suspensions

This manuscript is interested with the using Chlorazol black BH dye as a model compound. This photo reaction was obeyed first-order kinetics with low activation energy equal to 27.135 kJ/mol. Moreover, the thermodynamic parameters were calculated using the Arrhenius equation, the Eyring-Polanyi equation and the Gibbs equation, then proved this photo reaction is exothermic, with less random and spontaneous reaction. The best conditions were controlled with the using the artificial UV-A and found to be 100 mg/L (dye concentration), 200 mg (bulk ZnO), 7.63 as initial pH and 15°C, from the other side, the photo-decolorization efficiency at these best conditions, was reached to 99.072% At final, the suitable mechanism for decolorization and degradation of Chlorazol black BH Dye was suggested.