Characterization and photocatalytic activity of nitrogen-doped titanium(IV) oxide prepared by doping titania with TiN powder

Authors: Motoki Iwase, Keiji Yamada, Tsutomu Kurisaki, Hisanobu Wakita

Abstract:
Titanium(IV) oxide (TiO₂) was doped with a small amount of TiN powder to obtain anatase nitrogendoped TiO₂(N-TiO₂) with visible-light activity because the oxidation of TiN powder generally led to the formation of rutile N-doped TiO₂. The synthesized N-TiO2 was yellow, and its UV–vis spectrum of NTiO₂ showed a continuous and tailing absorption in the visible region. The properties of N-TiO₂ were compared with those of pureTiO2 and oxidized TiN particles. XRD patterns revealed that the ratio of the rutile phase to the anatase phase in N-TiO₂ was lower than that in pure TiO₂. These results indicate that the N atom dopants inhibit the phase transformation from anatase to rutile. The XRD patterns for all oxidized TiN particles showed the presence of the rutile phase. The results indicate that the TiO₂ rutile phase is more likely to be formed by the heat treatment of TiN particles. The lack of phenol degradation in the presence of ST01 under visible light (423–600 nm) irradiation indicated that the TiO₂ anatase phase was inactive to visible light. On the other hand, a decrease in the phenol content for N-TiO₂ calcined at 600^◦C (N-TiO₂(600)), which was almost completely in the anatase form, revealed that N-doped anatase moieties responded favorably to visible light. The degradation amount for TiN particles oxidized at 600 ◦C (TiN(600)) was comparable to thatfor N-TiO2(600)in spite ofthe factthatthe nitrogen content of TiN(600) was larger than that of N-TiO₂(600) (N/Ti = 1.0 vs. N/Ti = 0.10, respectively). The low degradation amount of TiN(600) was most likely due to the low fraction of the anatase phase and the presence of the cubic TiN phase. N-TiO₂ prepared using a small addition of TiN particles showed visible-light activity originating from the anatase N-doped moieties.

Keywords:
Nitrogen-doped
TiO₂ TiN
Titania
Photocatalysis
Visible light

Published in: Applied catalysis A: General  (Volume 455, Pages 1-266, 30 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Characterization and photocatalytic activity of nitrogen-doped titanium(IV) oxide prepared by doping titania with TiN powder

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