Abstract
Silver nanoparticles doped TiO 2 has been prepared and characterised by surface analytical methods such as BET surface area, scanning electron micrographs (SEM), X-ray diffraction (XRD), energy dispersive X-ray micro analysis (EDX), electron spin resonance (ESR) and diffuse reflectance spectroscopy (DRS). We have investigated the photocatalytic degradation of two Direct diazo dyes, Direct red 23 (DR 23) and Direct blue 53 (DB 53) in the aqueous suspensions of TiO 2 and Ag deposited TiO 2 nanoparticles under UV-A light irradiation in order to evaluate the various effects of silver deposition on the photocatalytic activity of TiO 2. The presence of silver in TiO 2 was found to enhance the photodegradation of DR 23 and DB 53. The higher activity of silver doped TiO 2 is due to the enhancement of electron–hole separation by the electron trapping of silver particles.
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