Abstract Surfactant free Titanium dioxide (TiO2) nanorods under different pH conditions were synthesized by a hydrothermal method. The structure, morphology and framework substitution of the as – prepared nanorods was characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), UV–Visible, Fourier Transform Infrared (FTIR) and X-ray Photon Spectroscopy (XPS). XRD analysis confirms the formation of anatase phase of TiO2 with tetragonal structure. FESEM micrograph confirms the formation of nanorods. The calculated band gap values of TiO2 nanorods was found to decrease with increasing pH from the optical absorption spectra. XPS spectra confirm the presence of Ti 2p and O 1s states. The photocatalytic activity of the nanorods against methyl orange (MO) was examined and their results have shown highest degradation (51%) of MO was achieved within 150 min.

中文翻译：

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不同pH条件下水热法合成、表征TiO2纳米棒及其光催化活性

摘要 采用水热法合成了不同pH条件下不含表面活性剂的二氧化钛(TiO2)纳米棒。通过 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、紫外-可见光、傅里叶变换红外 (FTIR) 和 X 射线光子光谱 ( XPS）。XRD 分析证实了具有四方结构的 TiO2 锐钛矿相的形成。FESEM 显微照片证实了纳米棒的形成。从光吸收光谱中发现计算出的 TiO2 纳米棒的带隙值随着 pH 值的增加而降低。XPS 光谱证实了 Ti 2p 和 O 1s 状态的存在。