Decolorization of Mixture of Dyes Containing Malachite Green and Orange II by Fenton-like Reagent

In this work, Fenton-like reagent (Fe3+/H2O2) that it is one of the advanced oxidation processes (AOPs) was used for the removal of mixture of dyes containing Malachite green(MG) and Orange II. Aim of this research is investigation of possibility of mixture of dyes decolorization by Fenton's reagent. In addition, effect of presence of one dyes on decolorization efficiency of another dye in mixture was examined. Results showed that in the presence of Orange II, removal efficiency of MG has been accelerated, whereas Orange II removal efficiency in the presence of Malachite green has been reduced. Influence of effective parameters on Fenton-like reaction such as H2O2 and Fe3+ concentration and initial concentration of dyes on the removal were investigated. Results showed that removal efficiency of dyes by increasing of Fe3+ concentration was increased. In addition, the best dye removal for both dyes were obtained at the molar ratio of H2O2/Fe3+=20. J. Color Sci. Tech. 1(2008), 83-89. © Institute for Colorants, Paint and Coatings.