Abstract Nitrogen-doped TiO2 fibers (N–TiO2 Fs) were successfully and efficiently fabricated using titanium diisopropoxide bis(acetylacetonate) and polyvinylpyrrolidone (PVP) as a carrier polymer and nitrogen source via centrifugal spinning and subsequent calcination methods. XRD analysis confirmed that N–TiO2 Fs contains only anatase and rutile phases. XPS analysis revealed that N-atoms (from PVP) were successfully incorporated into the lattice of TiO2 whereas DTA and FTIR analysis confirmed that calcination at 550 °C for 1 h is appropriate to remove all organic impurities from the N–TiO2 Fs. SEM images showed that the N–TiO2 Fs of diameter (0.65 μm–1.2 μm) were produced and controlled with the amount of Ti-precursor. BET analysis confirmed that the addition of commercial TiO2 nanoparticles increased the specific surface area of the N–TiO2 Fs. UV–Vis diffuse reflectance measurements showed that N–TiO2 Fs exhibited a stronger light absorption in the visible region and a red-shift which is responsible for narrow band gap energy owing to the presence of N-atoms in the TiO2 lattice. This results in enhanced photocatalytic activity of the synthesized N–TiO2 Fs for degradation of methylene blue under visible light irradiation.

中文翻译：

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用于可见光诱导光催化活性的氮掺杂 TiO2 纤维

摘要 以二异丙醇二（乙酰丙酮）钛和聚乙烯吡咯烷酮（PVP）为载体聚合物和氮源，通过离心纺丝和随后的煅烧方法成功高效地制备了氮掺杂的 TiO2 纤维（N-TiO2 Fs）。XRD 分析证实 N-TiO2 Fs 仅包含锐钛矿和金红石相。XPS 分析显示 N 原子（来自 PVP）成功地结合到 TiO2 的晶格中，而 DTA 和 FTIR 分析证实，在 550°C 下煅烧 1 小时适合从 N-TiO2 Fs 中去除所有有机杂质。SEM 图像显示直径 (0.65 μm–1.2 μm) 的 N-TiO2 Fs 是通过 Ti 前体的量产生和控制的。BET 分析证实，商业 TiO2 纳米颗粒的添加增加了 N-TiO2 Fs 的比表面积。UV-Vis 漫反射测量表明 N-TiO2 Fs 在可见光区表现出更强的光吸收和红移，由于 TiO2 晶格中存在 N 原子，红移是窄带隙能量的原因。这导致合成的 N-TiO2 Fs 在可见光照射下降解亚甲基蓝的光催化活性增强。