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

doi:10.1016/S1872-2067(10)60186-6

摘要/Abstract

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 H₂production, optoelectronic devices, sensors, and catalysis.

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

向全军, 余家国. 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[J]. 催化学报, 2011, 32(4): 525-531.

XIANG Quanjun, YU Jiaguo*. Photocatalytic Activity of Hierarchical Flower-Like TiO2 Superstructures with Dominant {001} Facets[J]. Chinese Journal of Catalysis, 2011, 32(4): 525-531.

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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

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

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