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In this paper, the peroxi-coagulation process was used to assess the decoloration of C.I. Basic Yellow 2 (BY2) in aqueous solutions. Decoloration experiments were performed in the presence of sulfate electrolyte media at pH 3.0 with a gas-diffusion electrode (GDE) as cathode. Electrochemical behavior of fabricated GDE and the amount of electrogenerated H₂O₂ on the graphite felt and GDE surface were investigated. The effect of operational parameters such as applied current, initial pH and initial dye concentration were studied in an attempt to reach higher decoloration efficiency. Up to 90% decoloration of the dye occurs in less than 30min. The mineralization of the dye was investigated by total organic carbon (TOC) measurements that showed 81% mineralization of 20mgl⁻¹ dye at 6h. An artificial neural networks (ANN) model was developed to predict the performance of the decoloration efficiency by peroxi …