N 掺杂富含 (001) 晶面 TiO2 纳米片的制备及 N 掺杂浓度对可见光催化活性的影响

doi:10.1016/S1872-2067(11)60348-3

催化学报 ›› 2012, Vol. 33 ›› Issue (4): 629-636.DOI: 10.1016/S1872-2067(11)60348-3

N 掺杂富含 (001) 晶面 TiO₂ 纳米片的制备及 N 掺杂浓度对可见光催化活性的影响

王卫, 陆春华a, 苏明星, 倪亚茹, 许仲梓b

南京工业大学材料化学国家重点实验室, 南京工业大学材料科学与工程学院, 江苏南京 210009

收稿日期:2011-10-21 修回日期:2011-11-28 出版日期:2012-04-13 发布日期:2015-09-09

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

WANG Wei, LU Chunhuaa, SU Mingxing, NI Yaru, XU Zhongzib

State Key Laboratory of Materials-Orient Chemical Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China

Received:2011-10-21 Revised:2011-11-28 Online:2012-04-13 Published:2015-09-09

摘要/Abstract

摘要： 采用水热法制备了富含 (001) 晶面的锐钛矿型 TiO₂ 纳米片, 并通过改变热处理过程中 NH₃ 流速制备不同 N 掺杂浓度的 TiO₂ 纳米片. 运用 X 射线衍射、场发射扫描电镜、高分辨率透射电子显微镜、紫外-可见漫反射光谱、X 射线光电子能谱和荧光光谱对光催化剂进行了结构和性能表征, 并以罗丹明 B 为目标降解物, 考察了 N 掺杂浓度对 TiO₂ 纳米片可见光催化活性的影响. 结果表明, NH₃ 流速为 40 ml/min 时制备的 N 掺杂 TiO₂ 纳米片具有最低的光生电子-空穴复合速率, 最高的•OH 产生能力并表现出最高的光催化活性. 同时, 讨论了 N 掺杂浓度对 TiO₂ 纳米片可见光催化活性影响的机理.

关键词: 氮掺杂, 二氧化钛纳米片, 氮浓度, 光催化活性, (001) 晶面

Abstract: 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 °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 (λ > 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^–) and hole (h⁺) pairs recombination rate, and the highest hydroxyl radicle (•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.

Key words: nitrogen doping, titanium dioxide nanosheet, nitrogen concentration, photoactivity, (001) facets

王卫, 陆春华, 苏明星, 倪亚茹, 许仲梓. N 掺杂富含 (001) 晶面 TiO₂ 纳米片的制备及 N 掺杂浓度对可见光催化活性的影响[J]. 催化学报, 2012, 33(4): 629-636.

WANG Wei, LU Chun-Hua, SU Ming-Xing, NI Ya-Ru, XU Zhong-Zi. Synthesis, Characterization, and Nitrogen Concentration Depended Visible-Light Photoactivity of Nitrogen-Doped TiO₂ Nanosheets with Dominant (001) Facets[J]. Chinese Journal of Catalysis, 2012, 33(4): 629-636.

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N 掺杂富含 (001) 晶面 TiO₂ 纳米片的制备及 N 掺杂浓度对可见光催化活性的影响

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

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