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首页> 外文期刊>Materials Chemistry and Physics >Preparation of nanometer crystalline TiO2 with high photo-catalytic activity by pyrolysis of titanyl organic compounds and photo-catalytic mechanism
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Preparation of nanometer crystalline TiO2 with high photo-catalytic activity by pyrolysis of titanyl organic compounds and photo-catalytic mechanism

机译：钛氧基有机化合物的热解制备具有高光催化活性的纳米晶TiO2及其光催化机理

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摘要

Nanometer crystalline titania (TiO2) particles with high photo-catalytic activity can be obtained from pyrolysis of titanyl organic compounds. The particle sizes are mainly affected by calcinating temperature, and then the composition of crystal phase is affected not only by calcination temperature but also by calcination time. TGA-FTIR coupling analysis showed that some Ti4+ ions on the surface of TiO2 were induced into Ti3+ ones (oxygen vacancies) by carbon (C) formed from pyrolysis of titanyl organic compounds, on the other hand, some OH groups were formed on crystal surface for the presence of water from pyrolysis, which was proved on by XPS study. The researches on photo-catalytic activity as well as analysis of XPS indicate that the photo-catalytic activity of TiO2 was related to surface Ti3+ capacity, surface OH and Ti3+/OH ratio. When the Ti3+/OH ratio on the surface was close to 1, the nanometer crystalline TiO2 particles showed better photo-catalytic activity. (c) 2004 Elsevier B.V. All rights reserved.
机译：钛氧有机化合物的热解可以得到具有高光催化活性的纳米二氧化钛（TiO2）颗粒。粒度主要受煅烧温度的影响，然后结晶相的组成不仅受煅烧温度的影响，还受煅烧时间的影响。 TGA-FTIR耦合分析表明，钛氧有机化合物热解形成的碳（C）将TiO2表面的一些Ti4 +离子诱导成Ti3 +（氧空位），另一方面，在晶体表面形成了一些OH基。 XPS研究证明了热解水的存在。对光催化活性的研究以及对XPS的分析表明，TiO2的光催化活性与表面Ti3 +的容量，表面OH和Ti3 + / OH的比例有关。当表面上的Ti3 + / OH比接近于1时，纳米结晶TiO2颗粒表现出更好的光催化活性。 （c）2004 Elsevier B.V.保留所有权利。

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