Synthesis, Characterization, and Nitrogen Concentration Depended Visible-Light Photoactivity of Nitrogen-Doped TiO₂ Nanosheets with Dominant (001) Facets

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• 作者：Wei WANG ; Chunhua LU ; ^{chhlu@njut.edu.cn} ; Mingxing SU ; Yaru NI ; Zhongzi XU ; ^{xzznjut@163.com}
• 关键词：nitrogen doping ; titanium dioxide nanosheet ; nitrogen concentration ; photoactivity ; (001) facets
• 刊名：Chinese Journal of Catalysis
• 出版年：2012
• 期刊代码：3_18722067
• 类别：ce
• 出版时间：April-June, 2012
• 卷：33
• 期：4-6
• 页码：629-636
• 文件大小：558 K

摘要

Anatase TiO₂ nanosheets with dominant (001) facets were prepared by a simple hydrothermal method. Nitrogen-doped TiO₂ nanosheets (TiO₂-N) with different nitrogen concentration were successfully synthesized by annealing TiO₂ nanosheets in NH₃ atmosphere with different NH₃ flow rate at 400 掳C for 3 h. The morphology, nanostructures, and properties of TiO₂-N were characterized by X-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence. The effects of NH₃ flow rate on the nanostructures, properties, and visible-light photoactivity in the degradation of rhodamine B (RhB) aqueous solution under visible light (位> 400 nm) irradiation of the prepared photocatalysts were investigated. Among all the prepared photocatalysts including nitrogen modified P25 (Degussa), TiO₂-N prepared with a NH₃ flow rate of 40 ml/min gave the highest visible-light photoactivity because of the dominant (001) facets, visible light responsibility, the slowest photogenerated electron (e^{鈭?/sup>) and hole (h+) pairs recombination rate, and the highest hydroxyl radicle (路OH) generation ability. Based on these experiments and analysis, the mechanisms of how the nitrogen concentration affects the visible-light photoactivity of TiO₂-N were proposed.}