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纳米管钛酸在高温空气中(400℃≤T≤600℃)脱水得到含有高浓度束缚单电子氧空位(Vo˙)的新型TiO2.该TiO2体相中含有高浓度本征缺陷,表面却保持完整的化学计量比,具有可见光吸收、空气中十分稳定的性质,我们称之为第三代TiO2.但令人难解的是,该新型TiO2有可见光吸收却无可见光催化活性.本文对这种新型TiO2的导带电子寿命、光学行为特性等进行了研究,找出其在可见光下不显示反应活性的原因,提出在其表面构建外来电子陷阱,使可见光激发产生的体相光生电子转移到表面,从而成功地获得了一种具有可见光活性的光催化剂.
The nanotubes titanic acid was dehydrated in high temperature air (400 ℃ ≤T≤600 ℃) to obtain a new type of TiO2 with a high concentration of bound single electron oxygen vacancies (Vo˙). The TiO2 bulk phase contained high concentrations of intrinsic defects while the surface remained Complete stoichiometry, with visible light absorption, the air is very stable nature, we call the third generation of TiO2, but it is difficult to understand that the new TiO2 has visible light absorption but no visible photocatalytic activity.In this paper, The electronic conduction band and optical behavior of the conduction band of the novel TiO2 were investigated to find out the reasons why it does not show any reactivity under visible light. It is proposed to construct foreign electron traps on the surface of the TiO2 to transfer the photogenerated photoelectrons of the bulk phase excited by visible light to the surface , Thus successfully obtained a visible light activity of the photocatalyst.