Comparison of Ag deposition effects on the photocatalytic activity of nanoparticulate TiO 2 under visible and UV light irradiation

Comparison of Ag deposition effects on the photocatalytic activity of nanoparticulate TiO 2 under... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Photochemistry and Photobiology A: Chemistry Elsevier

Comparison of Ag deposition effects on the photocatalytic activity of nanoparticulate TiO 2 under visible and UV light irradiation

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Publisher
Elsevier
Copyright
Copyright © 2004 Elsevier B.V.
ISSN
1010-6030
eISSN
1873-2666
D.O.I.
10.1016/S1010-6030(03)00428-3
Publisher site
See Article on Publisher Site

Abstract

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

Journal of Photochemistry and Photobiology A: ChemistryElsevier

Published: Apr 15, 2004

References

  • Chem. Rev.
    Hoffmann, M.R; Martin, S.C; Choi, W; Bahnemann, D.W
  • J. Photochem. Photobiol. A
    Li, Y; Lu, G; Li, S

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