Removal of azo dyes from aqueos solution by advanced oxidation of, ozone, Uv-H2O2 fenton and determination of kinetic parameters

In this study oxidation of three composed of 3,4 and 5 aromatic ring of AO-II, AB-I and RR198 in water, was investigated by UV-H2O2, Ozone and Fenton advanced oxidation processes. In UV-H2O2 process, pH 3,0 for AO-II, pH7,0 for AB-I and pH10,0 for RR198 was decided as optimum decolorization pH values. pH10 was optium value for all three reactive dyes on the ozonation process. On UV-H2O2 and Fenton process, the optimum value of H2O2 was added to system three different dropped rates 0.5-1.0-2.0 mldk-1 and one time at the beginning of the reaction. The optimum ratio of [Fe+2]/[H2O2] (mM/mM) on Fenton process as 0.25 and [H2O2]/[Dye] on UV-H2O2 process as 25 were calculated. The oxidation ratio was decreased AO-II>AB-I>RR198 from small molecule to big molecule in all oxidation methods. Oxidation kinetics of AO-II, AB-I and RR198 successfully fitted pseudo first order kinetics model. The value of degradation rate constant for all dye was calculated.