State Key Laboratory of New Ceramic and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China.
Nanoscale. 2012 Feb 7;4(3):801-6. doi: 10.1039/c1nr11346a. Epub 2011 Dec 13.
Enhanced visible-light-driven photocatalysis of TiO(2) nanofibers have been prepared by the electrospinning method combined with a surface nitridation process. The visible-light-driven photo-catalytic activity of surface nitrided TiO(2) (N-TiO(2)) nanofibers has been evaluated using rhodamine B indicator, and it was found that the visible-light-driven photocatalytic activity of the electrospun TiO(2) nanofibers could be enhanced by nitridation in NH(3) atmosphere. The optimal visible-light photocatalytic activity of N-TiO(2) nanofibers exceeded that of pure TiO(2) nanofibers by a factor of more than 12. The nitridation temperature under NH(3) flow was found to play an important part in the performance of N-TiO(2) nanofibers, and the optimum temperature is 500 °C. Structure, morphology and photoluminescence of these nanofibers were studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscope (SEM) and photoluminescence (PL) spectroscopy. The mechanism of the enhancement of visible-light-driven photocatalytic activity by surface nitridation has been discussed.
采用静电纺丝法结合表面氮化处理制备了 TiO(2)纳米纤维的可见光催化性能得到增强。采用罗丹明 B 指示剂评价了表面氮化 TiO(2)（N-TiO(2)）纳米纤维的可见光光催化活性，发现 NH(3)气氛中的氮化可以提高静电纺 TiO(2)纳米纤维的可见光光催化活性。N-TiO(2)纳米纤维的最佳可见光光催化活性超过了纯 TiO(2)纳米纤维的 12 倍以上。在 NH(3)流下的氮化温度对 N-TiO(2)纳米纤维的性能起着重要作用，最佳温度为 500°C。通过 X 射线衍射（XRD）、X 射线光电子能谱（XPS）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）和光致发光（PL）光谱研究了这些纳米纤维的结构、形貌和光致发光。讨论了表面氮化增强可见光光催化活性的机理。
