In this work, black TiO₂ catalysts containing a large number of oxygen vacancies were prepared by sol-gel and calcination methods. The catalytic activity of the photocatalysts was evaluated by photocatalytic oxidation removal of NO. We found that black TiO₂ calcined at 400 °C in an N₂ atmosphere with appropriate oxygen vacancy removes up to 71.3 % of NO in 90 min under the illumination of UV light, which was significantly better than other samples. The prepared catalyst was characterized by X-ray diffraction, Raman spectroscopy, UV–vis, XPS, EPR, BET surface area analysis and Photo-electrochemical test. These results showed that oxygen vacancies played an important role in the photocatalytic NO removal process. An appropriate amount of oxygen vacancies in catalyst benefits the aggregation of electrons in oxygen vacancies and a large number of electrons reacted with H₂O₂ and NO under UV light, thereby the activity enhanced. It was also found through EPR that the number of oxygen vacancies increased with the rise of temperature, which means that the number of oxygen vacancies would affect the catalyst performance.

在这项工作中，通过溶胶-凝胶和煅烧方法制备了含有大量氧空位的黑色TiO ₂催化剂。通过光催化氧化去除NO来评估光催化剂的催化活性。我们发现黑色TiO ₂在N _2中于400°C煅烧在适当的氧气空缺的气氛下，在紫外线照射下，在90分钟内可去除高达71.3％的NO，这比其他样品要好得多。制备的催化剂通过X射线衍射，拉曼光谱，UV-vis，XPS，EPR，BET表面积分析和光电化学测试进行了表征。这些结果表明氧空位在光催化脱氮过程中起着重要作用。催化剂中适量的氧空位有利于氧空位中电子的聚集以及大量电子与H ₂ O ₂反应和在紫外线下的NO，因此活性增强。通过EPR还发现氧空位的数目随温度的升高而增加，这意味着氧空位的数目将影响催化剂的性能。