Yu Wanchao, Chen Fengjie, Wang Yarui, Zhao Lixia
State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences 18 Shuangqing Road, P.O. Box 2871 Beijing 100085 China
University of Chinese Academy of Sciences Beijing 100039 China.
RSC Adv. 2020 Aug 5;10(49):29082-29089. doi: 10.1039/d0ra06299e.
Reactive oxygen species (ROS) play an important role in the photocatalytic degradation of pollutants and are closely related to the surface defects of a semiconductor. However, the characterization of surface defects is very complex and a deeper understanding of them remains a great challenge. In this work, a series of nano-TiO was synthesized and their optical properties due to surface defects were studied. The results showed that the surface oxygen vacancies on nano-TiO can induce chemiluminescence (CL) by luminol. The greater the number of surface oxygen vacancies, the stronger the luminescence signal, and the greater the production of reactive oxygen species. Further studies revealed that the CL intensity was positively correlated with the oxygen vacancy content on the surface of nano-TiO. Moreover, there was also a clear correlation between the oxygen vacancies and photogenerated superoxide radicals (O˙) on nano-TiO suspensions. Therefore, a simple and rapid CL method was developed for evaluating the oxygen vacancy content and their implied ability to photogenerate O˙ on nano-TiO and has great potential in distinguishing surface oxygen vacancies and judging photocatalytic performance in oxides.
活性氧物种（ROS）在污染物的光催化降解中起着重要作用，并且与半导体的表面缺陷密切相关。然而，表面缺陷的表征非常复杂，对其进行更深入的理解仍然是一个巨大的挑战。在这项工作中，合成了一系列纳米TiO，并研究了由于表面缺陷导致的它们的光学性质。结果表明，纳米TiO上的表面氧空位可以通过鲁米诺诱导化学发光（CL）。表面氧空位的数量越多，发光信号越强，活性氧物种的产生量就越大。进一步的研究表明，CL强度与纳米TiO表面的氧空位含量呈正相关。此外，纳米TiO悬浮液中的氧空位与光生超氧自由基（O˙）之间也存在明显的相关性。因此，开发了一种简单快速的CL方法来评估纳米TiO上的氧空位含量及其隐含的光生O˙能力，并且在区分表面氧空位和判断氧化物的光催化性能方面具有巨大潜力。
