- 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
- Doi
- 10.1002/cssc.201300922
- Identifiers