Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Henan, China.
Photochem Photobiol. 2010 Nov-Dec;86(6):1222-9. doi: 10.1111/j.1751-1097.2010.00808.x. Epub 2010 Oct 11.
We found in our previous work that the high photoactivity of N-doped TiO(2) for the oxidation of propylene under visible light was attributed to the photoactive center V(o)(•)-NO-Ti and the formation of sub-band originated from a large amount of single-electron-trapped oxygen vacancies (denoted as V(o)(•); C. X. Feng, Y. Wang, Z. S. Jin, J. W. Zhang, S. L. Zhang, Z. S. Wu, Z. J. Zhang [2008], New J. Chem. 32, 1038). In the present study, the structure of the sub-band within E(g) of a representative sample N-NTA-400 was investigated by means of photoluminescence (PL) spectrometry and ultraviolet-visible light-near infrared diffuse reflectance spectra. The coaction of the sub-band and doped nitrogen on visible light photocatalytic activity of N-doped TiO(2) was also investigated. The electron spin resonance spectra measured under laser irradiation (λ = 532 nm) indicate that the doped nitrogen may contribute to stabilize the trapping electron center, i.e. surface oxygen vacancy (V(o)(••)), and hence suppress the PL, enhancing the photocatalytic activity.
在之前的工作中，我们发现氮掺杂 TiO(2) 在可见光下氧化丙烯的高光活性归因于光活性中心 V(o)(•)-NO-Ti 和大量单电子捕获氧空位形成的子带（表示为 V(o)(•)；C. X. Feng、Y. Wang、Z. S. Jin、J. W. Zhang、S. L. Zhang、Z. S. Wu、Z. J. Zhang [2008]，New J. Chem. 32, 1038）。在本研究中，通过光致发光（PL）光谱和紫外-可见近红外漫反射光谱研究了代表性样品 N-NTA-400 的 E(g) 内子带的结构。还研究了子带和掺杂氮对氮掺杂 TiO(2)可见光光催化活性的协同作用。在激光照射下（λ=532nm）测量的电子自旋共振谱表明，掺杂氮可能有助于稳定捕获电子中心，即表面氧空位（V(o)(••)），从而抑制 PL，提高光催化活性。
