Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis This paper presents a systematic study on two different preparation methods for titanium dioxide with silver. The silver can be incorporated by irradiating the reaction mixture during preparation to reduce silver ion to silver metal or by direct calcination of the sol–gel material to decompose silver nitrate to silver. Of the two methods, we found the latter produces a more effective photocatalytic material (6–50% improvement in catalytic efficiency), which is attributed to the fact that the silver is homogeneously dispersed throughout the material. The efficiency of the materials were examined using a Q-Sun solar simulator (visible light) and in Dublin summer sunlight (latitude 54°N). In both cases, the addition of increasing amounts of silver, for both batches of samples, significantly increases the rate of degradation of a model dye, rhodamine 6G (R6G), increasing the rate of degradation from 0.06 min −1 for TiO 2 to 0.34 min −1 for 5 mol% Ag–TiO 2 . This is attributed to the increasing visible absorption capacity due to the presence of silver nanoparticles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Photochemistry and Photobiology A: Chemistry Elsevier

Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

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Publisher
Elsevier
Copyright
Copyright © 2007 Elsevier B.V.
ISSN
1010-6030
eISSN
1873-2666
D.O.I.
10.1016/j.jphotochem.2007.02.010
Publisher site
See Article on Publisher Site

Abstract

This paper presents a systematic study on two different preparation methods for titanium dioxide with silver. The silver can be incorporated by irradiating the reaction mixture during preparation to reduce silver ion to silver metal or by direct calcination of the sol–gel material to decompose silver nitrate to silver. Of the two methods, we found the latter produces a more effective photocatalytic material (6–50% improvement in catalytic efficiency), which is attributed to the fact that the silver is homogeneously dispersed throughout the material. The efficiency of the materials were examined using a Q-Sun solar simulator (visible light) and in Dublin summer sunlight (latitude 54°N). In both cases, the addition of increasing amounts of silver, for both batches of samples, significantly increases the rate of degradation of a model dye, rhodamine 6G (R6G), increasing the rate of degradation from 0.06 min −1 for TiO 2 to 0.34 min −1 for 5 mol% Ag–TiO 2 . This is attributed to the increasing visible absorption capacity due to the presence of silver nanoparticles.

Journal

Journal of Photochemistry and Photobiology A: ChemistryElsevier

Published: Jun 25, 2007

References

  • Chem. Rev.
    Hoffmann, M.R.; Martin, S.T.; Choi, W.; Bahnemann, D.W.
  • Funct. Mater.
    Ichihashi, Y.; Yamashita, H.; Anpo, M.
  • Polyhedron
    Suresh, C.; Biju, V.; Mukundan, P.; Warrier, K.G.K.
  • J. Phys. Chem. B
    Hu, C.; Lan, Y.Q.; Qu, J.H.; Hu, X.X.; Wang, A.M.D.
  • J. Phys. Chem. B
    Xin, B.; Jing, L.; Ren, Z.; Wang, B.; Fu, H.

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