Mineralisation of methyl orange by electro-fenton process using a polypyrrole/oxit composite cathode

Abstract

To promote treatment efficiency, an efficient undivided electrochemical system using a Ppy (Cu_1,5Mn_1,5O₄) composite film on graphite cathode with high  production  rate  of  hydrogen peroxide was applied to the electro-Fenton oxidation of a model azo dye, methyl orange (MO). The decrease of MO  concentration and treatment efficiency during the electro-Fenton process was investigated by UV-Vis spectra and COD analyses. The results obtained confirme that using the cathode of PPy (Cu_1,5Mn_1,5O₄) allowe treating MO wiht very high efficiency. A solution of 1,53mM MO could be mineralized nearly totally by a  electrical charge of 0.08 A.h with a very high current yield.