Degradation of the azo dye Orange G in a fluidized bed reactor using iron oxide as a heterogeneous photo-Fenton catalyst

摘要: The heterogeneous Fenton process was employed to degrade Orange G (OG) using waste iron oxide as the catalyst in a three-phase fluidized bed reactor (3P-FBR). morphology and FTIR spectra of used BT4 were compared with fresh illustrate stability. reusability evaluated by measuring colour removal four successive cycles. effects major parameters, including pH, H2O2 concentration addition on decolourization OG investigated. A satisfactory efficiency (>92%) could be obtained under conditions tested, 78.9% TOC achieved at 50 mg L−1 initial concentration, 25 pH = 3 6 g addition. mainly attributed homogeneous photo-Fenton reaction, while catalytic played an important role removal. main intermediates identified GC/MS technique degradation pathway proposed.