Degradation of Organic Cibacron Navy FN-B Dye by Photocatalysis Process Using ZnS

Abstract

The photocatalysis process was studied in this research. UV irradiation as the illumination source was investigated to remove the Cibacron Navy FN-B organic dye from simulated wastewater using Zinc Sulfide treated with Hydrogen Peroxide as the catalyst. Four sets of experiments were conducted throughout the work; the effect of pH (4, 6, 8, and 10), ZnS dosage (0.5, 1.0, 1.5, and 2.0 gm), the initial concentration of dye (25, 50, 75, and 100 mg/L), and the concentration of H2O2 (0, 50, 100, 150, and 200 mg/L) on the photocatalysis process was examined. The effect of contact time was studied implicitly within the sets (0, 15, 30, 45, 60, 75, and 90 min). The optimum conditions for the best decolorization of dye were found to be as: pH=6.2 (the normal pH of the dye solution), ZnS=1.5gm, Co=25mg/L and H2O2=200mg/L, the decolorization of Navy dye increased with increasing the contact time with the ZnS. The addition of H2O2 enhanced the decolorization rate by 8%. A mechanism of the Navy dye degradation in the UV photocatalysis system was proposed. The Pseudo first order reaction rate was found to be applicable on the process and the first order reaction rate constant (k) was found to be 0.033 min−1 with a correlation coefficient of 97.3%.