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

Type
Article

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

KAUST Department
KAUST Catalysis Center (KCC)

Online Publication Date
2012-02-16

Print Publication Date
2012-02-28

Date
2012-02-16

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.

Citation
Kachina, A., Puzenat, E., Ould-Chikh, S., Geantet, C., Delichere, P., & Afanasiev, P. (2012). A New Approach to the Preparation of Nitrogen-Doped Titania Visible Light Photocatalyst. Chemistry of Materials, 24(4), 636–642. doi:10.1021/cm203848f

Acknowledgements
The authors gratefully acknowledge the King Abdullah University of Science and Technology for support of this research through the CADENCED project.

Publisher
American Chemical Society (ACS)

Journal
Chemistry of Materials

DOI
10.1021/cm203848f

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