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Preparation of Red TiO2 with Excellent Visible Light Absorption from Industrial TiOSO4 Solution for Photocatalytic
Hong Pu1,2, Congxue Tian2, Hui Zhang1
1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China.
Abstract:
At present, it is still difficult to significantly reduce the bandgap of TiO2 to promote its visible light absorption. Herein, we first synthesized sulfur-doped TiO2 from industrial TiOSO4 and then successfully synthesized red TiO2 nanoparticles by calcination with the N source melamine. Theoretical calculations show that predoped S could markedly decrease the formation energy and substitution energy of N-doped TiO2, especially in high N/Ti ratios. The red TiO2 nanoparticles have a low bandgap (2.10 eV) and exhibit remarkable visible light absorption capacity. Electron paramagnetic resonance measurements show that the red TiO2 has abundant oxygen vacancies and Ti3+. The synergetic effect of Ti3+, oxygen vacancies, and nonmetallic element doping leads to the bandgap of TiO2 significantly being reduced. In addition, the red TiO2 exhibits great photocatalytic activity in the visible light degradation of rhodamine B (Rh.B) and methylene blue (MB). This study provides a new idea for the preparation of TiO2 with high visible light absorption.
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