Photocatalytic reduction of methyl orange on Au/TiO 2 semiconductors Article

•  
• Overview
•  
• Research
•  
• Identity
•  
• Additional Document Info
•  
• View All
•  

Overview

abstract

• The photocatalytic reduction of Methyl Orange (MO) in aqueous solution by gold nanoparticles deposited by deposition-precipitation (DP) method on Degussa P25 was studied as a function of gold content. A shift to the red region on the UV spectra from 3.2 (Degussa P25) to 2.9-2.8 eV on the Au/TiO 2 materials was observed by the presence of gold. High photocatalytic activity for the MO reduction using lamps of low energy UV-Vis emission (λ = 365, 418, 435 nm) was obtained for the Au/TiO 2 semiconductors, improving the rate constant of reduction in a factor up to 3.2 times compared to TiO 2 P25 used as reference. These results evidence a very important role of gold in photoreduction reactions for organic compounds, in this particular case for the reduction of MO. © 2012 Elsevier B.V. All rights reserved.

authors

• Gómez R.
• Hernández-Gordillo A.
• López R.
• Moctezuma Velázquez Edgar
• Oros-Ruiz S.
• Pedraza-Avella J.A.
• Pérez E.

publication date

• 2012-01-01

published in

• Catalysis Communications  Journal

Research

keywords

• Gold nanoparticles; Gold-titania photocatalysts; Methyl orange; Photocatalysis; Photoreduction Degussa P25; Deposition precipitation methods; Gold Nanoparticles; Low energies; Methyl Orange; Photo-reduction; Photocatalytic activities; Photocatalytic reduction; Photoreduction reaction; TiO; UV spectrum; Azo dyes; Gold; Gold deposits; Metal nanoparticles; Photocatalysis; Photocatalysts; Rate constants; Titanium dioxide; Ultraviolet spectroscopy; Gold coatings

Identity

Digital Object Identifier (DOI)

• 10.1016/j.catcom.2012.01.028

Additional Document Info

start page

• 72

end page

• 76

volume

• 21