Degradation of Orange G by Advanced Oxidation Processes

L. I. DOUMIC; M. C. CASSANELLO; M.A. AYUDE; P. M. HAURE

Naantali

Conferencia; Catalysis in Multiphase Reactors CAMURE-8 International Symposium on Multifunctional Reactors ISMR-7; 2011

Fenton´s reactions have been among the most studied homogeneous AOPs (Chang and Chern, 2010). The aim of this work is to determine the influence of various parameters on the Fenton degradation of the synthetic dye Orange G (an azo dye) dissolved in water as a test chemical to represent the concerned dye group. Experiments have been carried out in a batch reactor with magnetic stirring, at several moderate temperatures and pH 3. Performance was evaluated by UV/VIS spectrophotometry, total organic carbon (TOC), pH and H2O2 concentration measurements. The reaction has been tested under typical experimental conditions used for Fenton and also promoted by simultaneous continuous and intermittent air circulation and with activated carbon addition. The effect of temperature, air flow, H2O2 concentration and dosification and reaction times on decolorization as well as on mineralization is analyzed. Decolorization of Orange G undergoes faster than mineralization. The presence of air bubbling into the solution definitely enhances the Fenton process and so does the sequential addition of H2O2.