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Nitrogen and Fluorine Roles in Visible-Light-Driven Anion-Doped TiO2 Photocatalysis

Published online by Cambridge University Press:  01 February 2011

Li Di ,
Naoki Ohashi ,
Shunichi Hishita ,
Taras Kolodiazhnyi  and
Hajime Haneda
Li Di
Affiliation:
LI.Di@nims.go.jp, National Institute for Materials Science, Advanced Materials Lab, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan, +81-29-851-3354 ext 8608, +81-29-855-1196
Naoki Ohashi
Affiliation:
OHASHI.Naoki@nims.go.jp, National Institute for Materials Science, Advanced materials Laboratory, Japan
Shunichi Hishita
Affiliation:
HISHITA.Shunichi@nims.go.jp, National Institute for Materials Science, Advanced materials Laboratory
Taras Kolodiazhnyi
Affiliation:
KOLODIAZHNYI.Taras@nims.go.jp, National Institute for Materials Science, Advanced materials Laboratory, Japan
Hajime Haneda
Affiliation:
HANEDA.Hajime@nims.go.jp, National Institute for Materials Science, Advanced materials Laboratory, Japan
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Abstract

This paper describes the synthesis of N-doped, F-doped, and N-F-codoped TiO2 powders (NTO, FTO, NFTO) by spray pyrolysis (SP). An overall comparative study was carried out on these anion-doped powders in order to elucidate the roles of N and F played in visible-light (Vis)-driven photocatalysis. The comparisons in their characteristics were based on the analysis of UV-Vis, PL, NH3-TPD and ESR spectra. As the results, N-doping into TiO2 resulted in both the improvement of Vis absorption and the creation of surface oxygen vacancies (OVs). F-doping produced several beneficial effects including the creation of surface OVs, the enhancement of surface acidity and the increase of Ti3+ ions. The photocatalytic tests indicated that the NFTO demonstrated the highest Vis activity for decomposition of both acetaldehyde and trichloroethylene. This high activity was ascribed to a synergetic consequence of doped N and F.

Keywords

catalyticspray pyrolysissurface reaction
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O09-04
Copyright
Copyright © Materials Research Society 2006

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References

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