Study of the degradation of a toxic dye by the catalytic system (H1.5Fe1.5P2W12Mo6O61, 22H2O)/H2O2

Abstract

In this work, the oxidation of an azo dye (Acid Yellow 99) by H2O2 in aqueous solution with the Dawson-type heteropolyanion [H1.5Fe1.5P2W12Mo6O61, 22H2O] acting as a catalyst was studied. The effects of different parameters—the initial pH, the initial H2O2 concentration, the mass of the catalyst, and the initial dye concentration—on the oxidation of the dye were investigated. The optimal conditions that led to maximum decolorization were found to be: pH 3, catalyst mass = 0.05 g, and [H2O2]0 = 0.03 mM for an initial dye concentration of 30 mg L−1.