Degradation of Reactive Black 5 Azo Dye Using Catalytic Ozonation with MgO

Abstract

The main aim of wastewater treatments is to dispose of wastewater safely without any adverse effect on human health and without polluting any water resources. Most of the dye molecules are toxic, recalcitrant, and chemically and photochemically stable and impart color to receiving water. Advanced oxidation processes are the most viable option to treat the wastewater. Among them catalytic ozonation allows a quicker removal of organic pollutants, because catalysts improve the oxidizing power of ozone, markedly reducing the economic cost.The catalytic ozonation of Reactive Black -5 solution in the presence of MgO catalysts was investigated in a laboratory scale batch reactor. The effects of solution pH (3–12), reaction time, MgO dosage (0.05-2 g/L), and initial dye concentration (100–500 ppm) on color and Total Organic Carbon removal were evaluated, and the findings were compared to those of ozonation without a catalyst. The results indicate that addition of MgO crystals greatly accelerate the degradation of RB-5 dye.