Visible‐light response C, N‐codoped TiO 2 nanotubes with high aspect ratios were prepared by a two‐step method. First the TiO 2 nanotubes were synthesized by an ion‐exchange method, and then the nanotubes were calcined at different temperatures with melamine as nitrogen and carbon source. X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), UV‐vis diffusive reflectance spectroscopy (DRS), scanning electron microscopy (SEM), and N 2 adsorption‐desorption isotherms were employed to characterize the as‐prepared samples. The results show that the nanotubular structure is destroyed when the calcination temperature is higher than 823 K. Further increase the temperature to 923 K, TiO 2 is reduced to TiO. The photocatalytic activity of the codoped TiO 2 nanotubes/nanorods was evaluated by degradation of Rhodamine B under visible‐light irradiation (> 420 nm). Compared with N doped P25, these codoped TiO 2 nanotubes/nanorods possess a superior photocatalytic acticity, owing to the synergistic effects of the nitrogen and carbon co‐doping.
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Wang et al. (2011) studied this question.
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