Degradation of the Reactive Black 5 by Fenton and Fenton-like system

Abstract

This study investigated Fenton and Fenton-like reactions to oxidize the commercial zao dye of Reactive Black 5. The parameters of ratio affecting the decolorization efficiency of Reactive Black 5 such as initial concentration of Fe2+, Fe3+ and H2O2 and initial pH value of dye solution were investigated. The results showed that the decolorization efficiency of Reactive Black 5 in Fenton oxidation was much faster than that of the Fenton-like oxidation in the initial stages and the decolorization efficiency was similar for both systems after 45 min. For the two oxidation systems, the decolorization efficiency of Reactive Black 5 depends on [Dye]0, [Fe2+]0 or [Fe3+]0, [H2O2]0 and pH.