Tailoring the properties and functionalities of TiO₂ nanofibers (NFs) via controlling the surface morphology, size, and compositions has attracted tremendous attention in the last few decades. Nevertheless, the development of an efficient and stable nanostructured TiO₂ NFs photocatalyst remains a challenge. Here, a heat treatment temperature-driven appearance on the microstructural evolution of TiO₂ NFs and the corresponding impact on the photodegradation of organic dye were reported based on the precursor decomposition, crystallization, surface structure and active radicals. Systematic TG/DSC curves, IR spectra, X-ray diffraction, SEM and TEM images, XPS and PL spectra illustrated the impact of temperature on thermal decomposition, microstructure, morphologies and surface structure. Anatase TiO₂ NFs at 900 °C with better morphological thermal stability, crystallite size and crystallinity possessed highest photocatalytic activities due to low electron-hole recombination and high production of •OH and O₂^•-. With the addition of radical scavengers, the results illustrated O₂^•- and •OH acted as the main radicals on the process of photocatalytic activities. The results of this work may provide valuable information to design and produce new highly efficient TiO₂ NFs materials for wastewater treatment applications.

在过去的几十年里，通过控制表面形态、尺寸和成分来定制TiO ₂纳米纤维 (NFs)的性质和功能已经引起了极大的关注。然而，开发高效且稳定的纳米结构 TiO ₂ NFs 光催化剂仍然是一个挑战。在这里，热处理温度驱动的外观对 TiO ₂的微观结构演变基于前体分解、结晶、表面结构和活性自由基，报道了 NFs 和对有机染料光降解的相应影响。系统的 TG/DSC 曲线、IR 光谱、X 射线衍射、SEM 和 TEM 图像、XPS 和 PL 光谱说明了温度对热分解、微观结构、形态和表面结构的影响。锐钛矿型 TiO ₂ NFs 在 900 °C 时具有更好的形态热稳定性、微晶尺寸和结晶度，由于电子-空穴复合率低以及 •OH 和 O ₂ ^{•- 的}产量高，因此具有最高的光催化活性。添加自由基清除剂后，结果表明 O ₂ ^•-而•OH是光催化活性过程中的主要自由基。这项工作的结果可能为设计和生产用于废水处理应用的新型高效 TiO ₂ NFs 材料提供有价值的信息。