Publication
Names
  • Samy Ould-Chikh
  • Olivier Proux
  • Pavel Afanasiev
  • Lhoussain Khrouz
  • Mohamed N. Hedhili
  • Dalaver H. Anjum
  • Moussab Harb
  • Christophe Geantet
  • Jean-Marie Basset
  • Eric Puzenat
Title
Photocatalysis with Chromium-Doped TiO2: Bulk and Surface Doping
Abstract
Abstract The photocatalytic properties of TiO2 modified by chromium are usually found to depend strongly on the preparation method. To clarify this problem, two series of chromium-doped titania with a chromium content of up to 1.56 wt % have been prepared under hydrothermal conditions: the first series (Cr:TiO2) is intended to dope the bulk of TiO2, whereas the second series (Cr/TiO2) is intended to load the surface of TiO2 with Cr. The catalytic properties have been compared in the photocatalytic oxidation of formic acid. Characterization data provides evidence that in the Cr/TiO2 catalysts chromium is located on the surface of TiO2 as amorphous CrOOH clusters. In contrast, in the Cr:TiO2 series, chromium is mostly dissolved in the titania lattice, although a minor part is still present on the surface. Photocatalytic tests show that both series of chromium-doped titania demonstrate visible-light-driven photo-oxidation activity. Surface-doped Cr/TiO2 solids appear to be more efficient photocatalysts than the bulk-doped Cr:TiO2 counterparts.
Keywords
chromium, doping, photochemistry, surface chemistry, titanium
Content
spectral data
Year
2014
Journal
ChemSusChem
Volume
7
Number
5
Pages
1361 - 1371
Document type
article
Publication state
published