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In this work, comparative photocatalytic degradation of an anionic dye (C.I. Acid Blue 92 (AB92)) and a cationic dye (C.I. Basic Blue 3 (BB3)) under UV light irradiation using supported TiO₂ nanoparticles in a rectangular photoreactor was studied. The investigated TiO₂ was Millennium PC-500 (crystallites mean size 8nm and surface area of 320.76m²/g) immobilized on glass plates. Response surface methodology (RSM) was employed to assess individual and interactive effects of the four main independent parameters (initial dye concentration, UV light intensity, flow rate and reaction time) on the decolorization efficiency. Central composite design was used for optimization of UV/TiO₂ process. Predicted values of decolorization efficiency were found to be in good agreement with experimental values for AB92 and BB3 (R²=0.9435 and Adj-R²=0.8941, R²=0.9309 and Adj-R²=0.8704, respectively). Optimization …