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Rapid evaluation of oxygen vacancies-enhanced photogeneration of the superoxide radical in nano-TiO(2)suspensions

机译：氧空位的快速评估 - 纳米TiO（2）悬浮液中超氧化物自由基的荧光

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摘要

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(2)was synthesized and their optical properties due to surface defects were studied. The results showed that the surface oxygen vacancies on nano-TiO(2)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-TiO2. Moreover, there was also a clear correlation between the oxygen vacancies and photogenerated superoxide radicals (O-2(-)) on nano-TiO(2)suspensions. Therefore, a simple and rapid CL method was developed for evaluating the oxygen vacancy content and their implied ability to photogenerate O(2)(-)on nano-TiO(2)and has great potential in distinguishing surface oxygen vacancies and judging photocatalytic performance in oxides.
机译：活性氧物质（ROS）在光催化的污染物降解中发挥着重要作用，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，对它们的更深层次的了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（2），研究了由于表面缺陷引起的光学性质。结果表明，纳米TiO（2）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大，发光信号越强，反应性氧物质的产生越大。进一步的研究表明，CL强度与纳米TiO2表面上的氧空位含量正相关。此外，氧空位和光发生的超氧化物自由基（O-2（ - 2）悬浮液上的氧气空位和光催化的超氧化物自由基（O-2（））也存在明显的相关性。因此，开发了一种简单而快速的CL方法，用于评估氧空位含量及其在纳米 - TiO（2）上的光催化O（2）（ - ）的暗示能力，并且在区分表面氧空位和判断光催化性能方面具有很大的潜力氧化物。

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  • 来源
    《RSC Advances》 |2020年第49期|共8页
  • 作者

    Yu Wanchao; Chen Fengjie; Wang Yarui; Zhao Lixia;

  • 作者单位

    Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Environm Chem &

    Ecotoxicol 18 Shuangqing Rd POB 2871 Beijing 100085 Peoples R China;

    Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Environm Chem &

    Ecotoxicol 18 Shuangqing Rd POB 2871 Beijing 100085 Peoples R China;

    Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Environm Chem &

    Ecotoxicol 18 Shuangqing Rd POB 2871 Beijing 100085 Peoples R China;

    Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Environm Chem &

    Ecotoxicol 18 Shuangqing Rd POB 2871 Beijing 100085 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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