Abstract
The decolorization of wastewater using in situ electrogenerated OH free radicals was examined and methyl orange (MO) was selected as the model compound. The decolorization of MO was found to be a chemical reaction of MO with active hydroxyl (OH) free radical producing from the decomposition of hydrogen peroxide which was formed from the cathodic reduction of oxygen. The results indicate that the current density in the range from ‐0.125 to ‐0.375 mA cm−2 or potential at about ‐90.00 mV (vs. Ag/AgCl) would be the optimal choice. Agitation rate, concentrations of ferrous ion and MO are the major factors affecting the decolorization of MO. The oxygen partial pressure and higher temperatures do not influence the decolorization of MO significantly.
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