Nano-TiO is known as a photocatalyst with high catalytic activity. However, it should be emphasized that the bandgap of nano-TiO 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 under visible light by the strategy of heat treatment under vacuum was investigated in this study. The structure and photocatalytic activity of nano-TiO 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 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 and the mechanism of oxygen vacancy defects to expand the wavelength of light that nano-TiO absorbs to the visible portion of the spectrum have also been addressed in this paper.
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| http://dx.doi.org/10.1039/c9ra03556g | DOI Listing |
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