C.I. REACTIVE BLACK 5 BOYARMADDESİNİN FOTOKALİTİK RENK GİDERİMİ

Abstract

In this study, the use of H2O2 (hydrogen peroxide)/UV (Ultraviolet) process, from the advanced oxidation processes used for industrial wastewater treatment, has been investigated on photocatalytic color removal of C.I. Reactive Black 5 dye. The samples were examined for hydrogen peroxide initial concentration, temperature, pH, color and COD (chemical oxygen demand) values. The color removal rates reached were 99.71% in neutral medium, 99.86% in acidic medium and 94.81% in basic medium. Furthermore, the corresponding COD removal rates were 38.91% and 41.44% and 20,73, respectively. It was observed that the fastest color removal at the initial concentration of 0.5 ml/l H2O2 occurred in acidic medium (99% color removal rate at 55 min). Experiments were carried out by changing the initial concentration of hydrogen peroxide in the acidic medium, which reached the fastest color removal results. It was observed that the concentration increase increased the rate of decolorization (99% color yield time: 30 min) compared to the concentrations of 0.5 and 2.5 ml/l H2O2 in these experiments. However, between hydrogen concentrations of 2.5 ml / l and 5 ml / l H2O2 there was no difference in the increase in the amount of peroxide. As a result, photocatalytic removal of color obtained for C.I. Reactive Black 5; showed that H2O2/UV application can be used successfully in the treatment of industrial wastewater.