Photocatalysis with chromium-doped TiO2: Bulk and surface doping

Handle URI:
http://hdl.handle.net/10754/563497
Title:
Photocatalysis with chromium-doped TiO2: Bulk and surface doping
Authors:
Ould-Chikh, Samy ( 0000-0002-3486-0944 ) ; Proux, Olivier; Afanasiev, Pavel V.; Khrouz, Lhoussain; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Anjum, Dalaver H.; Harb, Moussab ( 0000-0001-5540-9792 ) ; Geantet, Christophe; Basset, Jean-Marie ( 0000-0003-3166-8882 ) ; Puzenat, Eric
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.
KAUST Department:
KAUST Catalysis Center (KCC); Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Core Labs
Publisher:
Wiley-Blackwell
Journal:
ChemSusChem
Issue Date:
15-Apr-2014
DOI:
10.1002/cssc.201300922
PubMed ID:
24737636
Type:
Article
ISSN:
18645631
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).
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorOuld-Chikh, Samyen
dc.contributor.authorProux, Olivieren
dc.contributor.authorAfanasiev, Pavel V.en
dc.contributor.authorKhrouz, Lhoussainen
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorHarb, Moussaben
dc.contributor.authorGeantet, Christopheen
dc.contributor.authorBasset, Jean-Marieen
dc.contributor.authorPuzenat, Ericen
dc.date.accessioned2015-08-03T11:52:54Zen
dc.date.available2015-08-03T11:52:54Zen
dc.date.issued2014-04-15en
dc.identifier.issn18645631en
dc.identifier.pmid24737636en
dc.identifier.doi10.1002/cssc.201300922en
dc.identifier.urihttp://hdl.handle.net/10754/563497en
dc.description.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.en
dc.description.sponsorshipWe 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).en
dc.publisherWiley-Blackwellen
dc.subjectchromiumen
dc.subjectdopingen
dc.subjectphotochemistryen
dc.subjectsurface chemistryen
dc.subjecttitaniumen
dc.titlePhotocatalysis with chromium-doped TiO2: Bulk and surface dopingen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentCore Labsen
dc.identifier.journalChemSusChemen
dc.contributor.institutionBM30B CRG FAME Beamline ESRF, F-38043 Grenoble 9, Franceen
dc.contributor.institutionUniv Lyon 1, Inst Rech Catalyse & Environm Lyon, F-69626 Villeurbanne, Franceen
dc.contributor.institutionEcole Normale Super Lyon, Chem Lab, F-69364 Lyon 7, Franceen
kaust.authorOuld-Chikh, Samyen
kaust.authorHedhili, Mohamed N.en
kaust.authorAnjum, Dalaver H.en
kaust.authorHarb, Moussaben
kaust.authorBasset, Jean-Marieen
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