In this report, we present a facile approach for the synthesis of a brown TiO₂ material rich in oxygen vacancies under atmospheric conditions with titanium tetrachloride, oxalic acid and anhydrous ethanol as raw materials. The samples were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance (UV–vis DRS), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FTIR) and Raman. The visible light photocatalytic activity of the samples was evaluated by degrading of methylene blue solution. XRD and Raman results showed that the brown TiO₂ was anatase TiO₂. XPS and EPR indicated the presence of abundant oxygen vacancies in the brown TiO₂. UV–vis DRS illustrated that the brown TiO₂ had a strong absorption in the visible light region. The photocatalytic activity measurement indicated that the visible light photocatalytic performance of the brown TiO₂ was excellent. The surface oxygen vacancies played a key role for the significant enhancement of the brown TiO₂ photocatalytic performance.

在本报告中，我们提供了一种在大气条件下以四氯化钛，草酸和无水乙醇为原料合成富含氧空位的棕色TiO ₂材料的简便方法。样品的特征在于X射线衍射（XRD），UV可见漫反射（UV-DRS），电子顺磁共振（EPR），X射线光电子能谱（XPS），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM），傅立叶红外光谱（FTIR）和拉曼光谱。通过亚甲基蓝溶液的降解来评估样品的可见光光催化活性。XRD和Raman结果表明棕色TiO ₂为锐钛矿型TiO _2。。XPS和EPR表明在棕色TiO _2中存在大量的氧空位。紫外可见DRS表明，棕色TiO ₂在可见光区域具有很强的吸收能力。光催化活性的测量表明，棕色TiO ₂的可见光光催化性能优异。表面氧空位对于棕色TiO _2的光催化性能的显着增强起关键作用。