How the Anatase-to-Rutile Ratio Influences the Photoreactivity of TiO2
How the Anatase-to-Rutile Ratio Influences the Photoreactivity of TiO2
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DOI：
10.1021/jp2086768
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发表时间：
2011-12-15
影响因子：
3.7
通讯作者：
Besenbacher, Flemming
中科院分区：
文献类型：
--
作者：
Su, Ren;Bechstein, Ralf;Besenbacher, Flemming
1991 年，比克利等人。提出了 Degussa P25 中锐钛矿和金红石之间的协同效应。从那时起，关于该提议的正确性、协同作用的起源以及正确的多晶型物组成一直存在激烈的争论。然而，缺少对具有不同锐钛矿与金红石比率但其他特性相同的纯二氧化钛样品的比较。在本文中，我们报道了一系列完全纯净、高度多孔的二氧化钛薄膜，它们具有相同的晶粒尺寸、表面积和结晶度，但多晶型物组成不同。利用亚甲基蓝的光催化氧化研究锐钛矿与金红石的比例对光反应性的影响。我们清楚地观察到锐钛矿与金红石比率明确范围内的协同效应。与纯锐钛矿相比，含有近似 60% 锐钛矿和近似 40% 金红石的薄膜表现出最佳性能，活性提高了 50%。
In 1991, Bickley et al. proposed a synergetic effect between anatase and rutile in Degussa P25. Since then, there has been an intensive debate about the correctness of this proposal, the origin of the synergism, and the right polymorph composition. However, a comparison of pure titanium dioxide samples with various anatase-to-rutile ratios, but otherwise identical properties, is missing. In this paper, we report about a series of utterly pure, highly porous titanium dioxide films with identical grain sizes, surface areas, and crystallinity, but varying polymorph compositions. Photocatalytic oxidation of methylene blue was utilized to investigate the influence of the anatase-to-rutile ratio on the photoreactivity. We clearly observe the synergetic effect within a well-defined range of anatase-to-rutile ratios. A film with similar to 60% anatase and similar to 40% rutile exhibits optimal performance at a 50% improved activity compared with pure anatase.