A new approach to the preparation of nitrogen-doped titania visible light photocatalyst

Handle URI:
http://hdl.handle.net/10754/562099
Title:
A new approach to the preparation of nitrogen-doped titania visible light photocatalyst
Authors:
Kachina, Anna; Puzenat, Eric; Ould-Chikh, Samy ( 0000-0002-3486-0944 ) ; Geantet, Christophe; Délichère, Pierre; Afanasiev, Pavel V.
Abstract:
A new simple method is described, allowing introduction of nitrogen into the TiO 2 lattice at low temperatures. The technique is based on the introduction of oxophilic molecules, such as CCl 4, into the reaction mixture. The treatment of titanium dioxide powders by NH 3-CCl 4 mixtures leads to highly dispersed N-doped TiO 2. As compared to bare TiO 2 or to the same oxide treated with sole NH 3, the solids treated with NH 3-CCl 4 mixtures showed a stronger red shift in optical absorption and enhanced photocatalytic activity under visible light, as demonstrated for two reactions of formic acid oxidation and photocatalytic production of hydrogen from methanol. The nitridation temperature can be significantly decreased by introducing CCl 4, because of a favorable change of the reaction thermodynamics. Not only can higher specific surface area of materials be obtained as a result of avoiding sintering but a higher amount of nitrogen is introduced in a position beneficial for the enhanced catalytic activity. The X-ray photoelectron spectroscopy study demonstrated increased surface concentration of nitrogen having N 1s binding energy near 399 eV. As established by ESR, the nature of paramagnetic species generated by treatments is strongly dependent on the titania polymorph variety and crystallinity as well as on the treatment conditions, but in all cases the major part of introduced nitrogen remains ESR-silent. © 2012 American Chemical Society.
KAUST Department:
KAUST Catalysis Center (KCC)
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
28-Feb-2012
DOI:
10.1021/cm203848f
Type:
Article
ISSN:
08974756
Sponsors:
The authors gratefully acknowledge the King Abdullah University of Science and Technology for support of this research through the CADENCED project.
Appears in Collections:
Articles; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorKachina, Annaen
dc.contributor.authorPuzenat, Ericen
dc.contributor.authorOuld-Chikh, Samyen
dc.contributor.authorGeantet, Christopheen
dc.contributor.authorDélichère, Pierreen
dc.contributor.authorAfanasiev, Pavel V.en
dc.date.accessioned2015-08-03T09:44:45Zen
dc.date.available2015-08-03T09:44:45Zen
dc.date.issued2012-02-28en
dc.identifier.issn08974756en
dc.identifier.doi10.1021/cm203848fen
dc.identifier.urihttp://hdl.handle.net/10754/562099en
dc.description.abstractA new simple method is described, allowing introduction of nitrogen into the TiO 2 lattice at low temperatures. The technique is based on the introduction of oxophilic molecules, such as CCl 4, into the reaction mixture. The treatment of titanium dioxide powders by NH 3-CCl 4 mixtures leads to highly dispersed N-doped TiO 2. As compared to bare TiO 2 or to the same oxide treated with sole NH 3, the solids treated with NH 3-CCl 4 mixtures showed a stronger red shift in optical absorption and enhanced photocatalytic activity under visible light, as demonstrated for two reactions of formic acid oxidation and photocatalytic production of hydrogen from methanol. The nitridation temperature can be significantly decreased by introducing CCl 4, because of a favorable change of the reaction thermodynamics. Not only can higher specific surface area of materials be obtained as a result of avoiding sintering but a higher amount of nitrogen is introduced in a position beneficial for the enhanced catalytic activity. The X-ray photoelectron spectroscopy study demonstrated increased surface concentration of nitrogen having N 1s binding energy near 399 eV. As established by ESR, the nature of paramagnetic species generated by treatments is strongly dependent on the titania polymorph variety and crystallinity as well as on the treatment conditions, but in all cases the major part of introduced nitrogen remains ESR-silent. © 2012 American Chemical Society.en
dc.description.sponsorshipThe authors gratefully acknowledge the King Abdullah University of Science and Technology for support of this research through the CADENCED project.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectformic acid oxidationen
dc.subjecthydrogen productionen
dc.subjectN-dopeden
dc.subjectphotocatalysten
dc.subjecttitaniaen
dc.titleA new approach to the preparation of nitrogen-doped titania visible light photocatalysten
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionUniv Lyon 1, Inst Rech Catalyse, F-69626 Villeurbanne, Franceen
dc.contributor.institutionUniv Lyon 1, Environm Lyon IRCELYON, UMR 5256, CNRS, F-69626 Villeurbanne, Franceen
kaust.authorOuld-Chikh, Samyen
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