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    Photocatalysis with chromium-doped TiO2: Bulk and surface doping

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    Type
    Article
    Authors
    Ould-Chikh, Samy cc
    Proux, Olivier
    Afanasiev, Pavel V.
    Khrouz, Lhoussain
    Hedhili, Mohamed N. cc
    Anjum, Dalaver H. cc
    Harb, Moussab cc
    Geantet, Christophe
    Basset, Jean-Marie cc
    Puzenat, Eric
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Chemical Science Program
    Core Labs
    Imaging and Characterization Core Lab
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2014-04-15
    Online Publication Date
    2014-04-15
    Print Publication Date
    2014-05
    Permanent link to this record
    http://hdl.handle.net/10754/563497
    
    Metadata
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    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.
    Citation
    Ould-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
    Sponsors
    We 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).
    Publisher
    Wiley
    Journal
    ChemSusChem
    DOI
    10.1002/cssc.201300922
    PubMed ID
    24737636
    ae974a485f413a2113503eed53cd6c53
    10.1002/cssc.201300922
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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