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Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO2

机译：真空热处理对纳米TiO2结构和可见光光催化活性的影响

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Nano-TiO _(2) is known as a photocatalyst with high catalytic activity. However, it should be emphasized that the bandgap of nano-TiO _(2) is wide, which limits its photocatalytic efficiency in response to visible light and thus hinders its potential application. Improving the photocatalytic activity of nano-TiO _(2) under visible light by the strategy of heat treatment under vacuum was investigated in this study. The structure and photocatalytic activity of nano-TiO _(2) before and after heat treatment under vacuum were compared and analyzed by XRD, TEM, HRTEM, XPS and UV-Vis-NIR, respectively. The results show that oxygen vacancies were introduced into the crystal structure of nano-TiO _(2) to change its inherent energy band structure. Particularly, the samples after heat treatment under vacuum exhibited high photocatalytic activity under visible light. In addition, the formation mechanism of non-stoichiometric compound TiO _(2? x ) and the mechanism of oxygen vacancy defects to expand the wavelength of light that nano-TiO _(2) absorbs to the visible portion of the spectrum have also been addressed in this paper.
机译：纳米TiO_（2）被称为具有高催化活性的光催化剂。然而，应该强调的是，纳米TiO_（2）的带隙较宽，这限制了其对可见光的光催化效率，从而阻碍了其潜在的应用。研究了通过真空热处理策略提高纳米TiO_（2）在可见光下的光催化活性。通过XRD，TEM，HRTEM，XPS和UV-Vis-NIR对纳米TiO_（2）的真空热处理前后的结构和光催化活性进行了比较和分析。结果表明，氧空位被引入到纳米TiO_（2）的晶体结构中以改变其固有的能带结构。特别地，在真空下热处理后的样品在可见光下表现出高的光催化活性。此外，非化学计量化合物TiO _（2αx）的形成机理和氧空位缺陷使纳米TiO _（2）吸收的光的波长扩展到光谱的可见光部分的机理也已被发现。本文讨论。

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