Afanasiev, Pavel V.
Hedhili, Mohamed N.
Anjum, Dalaver H.
KAUST DepartmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
Chemical Science Program
Imaging and Characterization Core Lab
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Online Publication Date2014-04-15
Print Publication Date2014-05
Permanent link to this recordhttp://hdl.handle.net/10754/563497
MetadataShow full item record
AbstractThe 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.
CitationOuld-Chikh, S., Proux, O., Afanasiev, P., Khrouz, L., Hedhili, M. N., Anjum, D. H., … Puzenat, E. (2014). Photocatalysis with Chromium-Doped TiO2: Bulk and Surface Doping. ChemSusChem, 7(5), 1361–1371. doi:10.1002/cssc.201300922
SponsorsWe gratefully acknowledge the King Abdullah University of Science and Technology for support of this research through the CADENCED project. The analytical service of IRCELYON is acknowledged for elemental analysis. We acknowledge the KAUST Imaging and Characterization core lab, and scientific and technical assistance of Drs. Rachid Sougrat (TEM), Yang Yang (Raman), and Bei Zhang (SQUID). Yves Joly (Institut Neel) is kindly acknowledged for fruitful discussions related to XANES and his assistance with using the FDMNES code. Anna Carlsson is thanked for STEM characterizations at FEI Company (Netherlands).
- Formation of hydroxyl radicals and kinetic study of 2-chlorophenol photocatalytic oxidation using C-doped TiO2, N-doped TiO2, and C,N Co-doped TiO2 under visible light.
- Authors: Ananpattarachai J, Seraphin S, Kajitvichyanukul P
- Issue date: 2016 Feb
- Aqueous Cr(VI) photo-reduction catalyzed by TiO2 and sulfated TiO2.
- Authors: Jiang F, Zheng Z, Xu Z, Zheng S, Guo Z, Chen L
- Issue date: 2006 Jun 30
- The synthesis of TiO2 and TiO2-Pt and their application in the removal of Cr (VI).
- Authors: Fan JW, Liu XH, Zhang J
- Issue date: 2011 Feb-Mar
- Facile synthesis of amino-functionalized titanium metal-organic frameworks and their superior visible-light photocatalytic activity for Cr(VI) reduction.
- Authors: Wang H, Yuan X, Wu Y, Zeng G, Chen X, Leng L, Wu Z, Jiang L, Li H
- Issue date: 2015 Apr 9
- Photocatalytic reduction of NO with NH3 using Si-doped TiO2 prepared by hydrothermal method.
- Authors: Jin R, Wu Z, Liu Y, Jiang B, Wang H
- Issue date: 2009 Jan 15