催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (4): 525-531.DOI: 10.1016/S1872-2067(10)60186-6

• 研究论文 • 上一篇    下一篇

暴露{001}面 TiO2 纳米片分等级花状结构的制备及其光催化活性

向全军, 余家国   

  1. 武汉理工大学材料复合新技术国家重点实验室, 湖北武汉 430070
  • 收稿日期:2010-10-15 修回日期:2010-11-13 出版日期:2011-04-18 发布日期:2014-08-30

Photocatalytic Activity of Hierarchical Flower-Like TiO2 Superstructures with Dominant {001} Facets

XIANG Quanjun, YU Jiaguo*   

  1. State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2010-10-15 Revised:2010-11-13 Online:2011-04-18 Published:2014-08-30

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摘要： 以钛酸盐纳米管为前驱体, 在 HF-H2O-C2H5OH 的混合溶液中, 采用一种简单的醇热方法合成了具有 87% 暴露{001}面的 TiO2 纳米片自组装形成的分等级花状 TiO2超结构. 运用 X 射线衍射、扫描电镜、透射电镜和 N2吸附-脱附等方法对样品进行了表征, 并在紫外光照射下于空气和溶液中分别考察了其光催化降解丙酮和甲基橙反应活性. 结果表明, 这种分等级花状结构 TiO2的光催化活性比商业 P25 和在纯水中制备得到的片状锐钛矿 TiO2 的光活性高得多. 这主要是由于该样品具有分等级的多孔结构, 暴露的{001}晶面和增强的光吸收能力. 这种分等级花状 TiO2超结构在太阳能电池、光催化产氢、光电子器件、传感器和催化方面也具有巨大的应用前景.

关键词: 二氧化钛, 纳米片, {001}晶面, 分等级花状二氧化钛超结构, 光催化活性, 丙酮, 甲基橙

Abstract: The fabrication of well defined hierarchical structures of anatase TiO2 with a high percentage of reactive facets is of great importance and challenging. Hierarchically flower-like TiO2 superstructures (HFTS) self-assembled from anatase TiO2 nanosheets with exposed {001} facets (up to 87%) were synthesized by a simple alcohothermal strategy in a HF-H2O-C2H5OH mixed solution using titanate nanotubes as precursor. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2 adsorption-desorption isotherms. The photocatalytic activity was evaluated by the photocatalytic oxidation decomposition of acetone in air and methyl orange in aqueous solution under UV illumination. The photocatalytic activity of HFTS was much higher than that of commercial Degussa P25 and tabular-shaped anatase TiO2 obtained using pure water as the synthesis medium. The enhancement in photocatalytic activity was related to several factors, including the hierarchically porous structure, exposed {001} facets, and increased light harvesting ability. The HFTS was also of interest for use in solar cells, photocatalytic H2 production, optoelectronic devices, sensors, and catalysis.

Key words: titanium dioxide, {001} facet, hierarchical flower-like titanium dioxide superstructure, photocatalytic activity, acetone, methyl orange