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Treatment of a dye solution containing C.I. Acid Red 17 (AR17) by photoelectro-Fenton (PEF) combined with photocatalytic process was studied. Carbon nanotube-polytetrafluoroethylene (CNT-PTFE) electrode was used as cathode. The investigated photocatalyst was Millennium PC-500 TiO₂ with crystallites mean size of 5–10nm immobilized on non-woven paper. A comparison of electro-Fenton (EF), UV/TiO₂, PEF and PEF/UV/TiO₂ processes for decolorization of AR17 solution was performed. Results showed that color removal follows the decreasing order: PEF/UV/TiO₂>PEF>EF>UV/TiO₂. Response surface methodology (RSM) was employed to assess individual and interactive effects of the four main independent parameters in PEF/UV/TiO₂ process. Analysis of variance (ANOVA) showed a high coefficient of determination value (R²=0.978) and satisfactory prediction second-order regression. The optimum …