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In this work, a new mixed-ligand binuclear Co(II) complex of Schiff base was prepared. Moreover, the characterization of this prepared complex was performed by measurement of melting points, UV-Vis spectra, FT-IR spectra, and magnetic susceptibility measurements, and later compared with metal and ligand solutions. It has been discovered that the Schiff bases with Co(II) ion forms a binuclear complex with a stoichiometry of molar ratio 1:2 from "metal:ligand". The photodecolorization of this complex was done under UV light for ZnO's suspension solution. The results of this photodecolorization showed that the greatest efficiency was obtained with the use of ZnO dose of 300 mg/100 mL and at an initial pH of 7. The decolorization activation energy for this complex is a small value of 11.289 kJ mol -1 . Additionally, the thermodynamic study for this reaction is non-spontaneous, endothermic and less random.

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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.