Use of fenton reagent as advanced oxidative process for removing textile dyes from aqueous solutions

Decolorization of aqueous solutions containing an azo dye (reactive yellow 84) was achieved by advanced oxidative process using fenton reagent. the optimum amounts of fenton reagent was 25 mg/l of fe2+ and 250 mg/l of h2o2 for an initial reactive yellow 84 concentration at 60 mg/l. the initial fe2+ concentration in the fenton reagent affected the degradation efficiency,rate and kinetics. the ratio of fe2+/h2o2 is found equal to 0.1 to give the best result for the decolorization efficiency. the fenton process was effective under ph 3 and the decolorization efficiency of reactive yellow 84 attained 85% for 20 min reaction time. kinetics decolorization of ry84 followed pseudo second-order reaction. the reaction characteristic of oxidative reaction for decolorization efficiency process was evaluated as thermodynamically spontaneous under natural conditions. the value of activation energy is determined and is equal to 16.78 kj/mol,this low value may show that the oxidative reaction proceeds with low energy barrier.