Degradation of Acid Orange 7 in aqueous solution by a novel electro/Fe2+/peroxydisulfate process

► A novel process named as “elecro/Fe2+/peroxydisulfate” process was proposed. ► The effect of operating parameters on the decolorization was investigated. ► The main intermediate products were determined by GC-MS technique. ► A plausible degradation pathway of Acid Orange 7 was proposed. ► The changes of COD and the acute toxicity during the treatment were monitored.