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

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• 作者：Motoki Iwase ; Keiji Yamada ; Tsutomu Kurisaki ; Hisanobu Wakita ; ^{wakita@fukuoka-u.ac.jp}
• 关键词：Nitrogen-doped TiO2 ; TiN ; Titania ; Photocatalysis ; Visible light
• 刊名：Applied Catalysis A: General
• 出版年：2013
• 出版时间：30 March, 2013
• 年：2013
• 卷：455
• 期：Complete
• 页码：86-91
• 全文大小：766 K

文摘

Titanium(IV) oxide (TiO₂) was doped with a small amount of TiN powder to obtain anatase nitrogen-doped 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 N-TiO₂ 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 ¡ãC (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 ¡ãC (TiN(600)) was comparable to that for N-TiO₂(600) in spite of the fact that the 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.