The photodegradation of color index (C.I.) Reactive Red 2 (RR2) using UV/TiO2, UV/TiO2/polyethyleneglycoi (PEG) and UV/TiO2/PEG/Pt systems was evaluated. The photocatalysts were produced via sol-gel method. The surface morphology of catalysts was observed by scanning electron microscopy. The concentration of RR2. sulfate release and total organic carbon were measured during the photodegradation of RR2. In 254 nm irradiation, the decolorization rate constants of UV/TiO2, UV/TiO2/PEG and UV/TiO2/PEG/Pt systems were 1.69,1.64 and 1.96 h(-1), respectively. Those for 365 nm irradiation were 0.54,0.64 and 0.74 h(-1), respectively, and those for 410 nm irradiation were 0.34, 0.64 and 0.73 h(-1), respectively. Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.