Photo-Fenton Oxidation of Azo Dye Reactive Black B Using an Immobilized Iron Oxide as Heterogeneous Catalyst

摘要

The heterogeneous oxidation of azo dye Reactive Black B (RBB) by the photo-Fenton system catalyzed with an immobilized iron oxide, B1 (supported with SiO_2 grain), was investigated. Reactive Black B oxidation was carried out in an expended-bed reactor in which the effect of Bl dosage on the decolorization and degradation of RBB was examined. Through pseudo-first-order kinetic studies, decolorization was found to be faster than degradation with a fixed rate constant ratio. By determining the iron dissolution from Bl, RBB oxidation was supposed to mainly occur on the Bl surface, which catalyzed the generation of hydroxyl radicals in the photo-Fenton reaction. Accordingly, the efficiency of photo-Fenton could reach 100% and 91.2% of decolorization and degradation, respectively, in 300 minutes. Water Environ. Res., 85, 340 (2013).