Photocatalysis with chromium-doped TiO2: Bulk and surface doping

Samy Ould-Chikh, Olivier Proux, Pavel V. Afanasiev, Lhoussain Khrouz, Mohamed N. Hedhili, Dalaver H. Anjum, Moussab Harb, Christophe Geantet, Jean-Marie Basset, Eric Puzenat

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49 Scopus citations

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:TiO 2 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. It's classified! The photocatalytic properties of TiO2 modified by chromium depend strongly on the preparation method. To clarify this problem, two types of modified titania are discussed: one with CrIII doped in the bulk and one with CrOOH clusters on the TiO2 surface (see picture). Both series show visible-light-driven photo-oxidation activity. However, surface modification appears to be a more efficient strategy. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)1361-1371
Number of pages11
JournalChemSusChem
Volume7
Issue number5
DOIs
StatePublished - Apr 15 2014

ASJC Scopus subject areas

  • Energy(all)
  • Environmental Chemistry
  • Materials Science(all)
  • Chemical Engineering(all)

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