We investigated the photocatalytic degradation of rhodamine B (RB) dye in the aqueous suspensions of TiO 2 (∼17 nm) and Ag-deposited TiO 2 nanoparticles under visible and UV light irradiation in order to evaluate and distinguish various effects of the Ag deposition on the TiO 2 photocatalytic activity. The TiO 2 and Ag–TiO 2 photocatalysts were characterized by XRD, TEM, XPS, UV-visible absorption and photon correlation spectroscopy. For comparison, the RB photodegradation was carried out in Degussa P25 TiO 2 and Ag-deposited P25 suspensions under the same condition. In the RB/Ag–TiO 2 system, Ag deposits significantly enhanced the RB photodegradation under visible light irradiation whereas the RB photodegradation under UV irradiation was slightly enhanced. The significant enhancement in the Ag–TiO 2 photoactivity under visible light irradiation can be ascribed to simultaneous effects of Ag deposits by both acting as electron traps and enhancing the RB adsorption on the Ag–TiO 2 surface.
Journal of Photochemistry and Photobiology A: Chemistry – Elsevier
Published: Apr 15, 2004
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