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The degradation of 100 cm³ of a solution with 0.167 mmol dm⁻³ Reactive Yellow 160 (RY160) azo dye in sulfate medium at pH 3.0 has been comparatively studied by anodic oxidation with electrogenerated H₂O₂ (AO-H₂O₂), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF). Trials were carried out with a stirred tank reactor equipped with a boron-doped diamond (BDD) anode and an air-diffusion cathode for H₂O₂ production, upon addition of 0.50 mmol dm⁻³ Fe²⁺ as catalyst in EF and PEF. The solution was slowly decolorized by AO-H₂O₂ because of the low rate of reaction of the azo dye and its colored products with hydroxyl radicals generated at the BDD anode from water oxidation. The color loss was enhanced in EF by the larger oxidation ability of hydroxyl radicals produced in the bulk from Fenton’s reaction between added Fe²⁺ and generated H₂O₂, whereas the solution was more rapidly …