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

Anna Kachina, Eric Puzenat, Samy Ould-Chikh, Christophe Geantet, Pierre Délichère, Pavel V. Afanasiev

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)636-642
Number of pages7
JournalChemistry of Materials
Volume24
Issue number4
DOIs
StatePublished - Feb 16 2012

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Fingerprint Dive into the research topics of 'A new approach to the preparation of nitrogen-doped titania visible light photocatalyst'. Together they form a unique fingerprint.

Cite this