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Nanoparticles of TiO 2 were synthesised by sol-gel technique and photo deposition of about 1% noble metal (M/TiO 2 , M = Ag, Au, and Pt) on TiO 2 was carried out. The catalysts were characterised by XRD, TEM, BET, FT-IR, and UV-Visible spectroscopy. Using commercial TiO 2 (P-25 Degussa), the conditions such as dye concentration, catalyst weight and pH were optimized for complete decolourisation of textile dye tartazine (TAZ) under UV and visible irradiations. Among the catalysts tested, the synthesised TiO 2 showed better photocatalytic activity than TiO 2 (P-25 Degussa). Whereas, M/TiO 2 catalysts showed remarkable photocatalytic activity towards the decolourisation of TAZ even under visible irradiation. This enhanced activity of M/TiO 2 catalyst may be attributed to the trapping of conduction band electrons by noble metals.

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