TiO2-Based Nanotubes Modified with Nitrogen: Synthesis, Characterizations, and Photocatalytic Activity

Cai Yun Yan; Qian Nan Sun; Qing Chang; Yen Ping Peng

doi:10.4028/www.scientific.net/AMR.864-867.583

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TiO₂-Based Nanotubes Modified with Nitrogen: Synthesis, Characterizations, and Photocatalytic Activity

Abstract:

This study employs a rapid, energy frugal and environmental friendly method to synthesize nitrogen doped titanate nanotubes (NTNTs), and uses TEM, XRD, Raman, Nitrogen adsorption-desorption isotherms analysis, and UV-vis spectroscopy to characterize the obtained NTNTs. TEM results indicate that NTNTs retain a tubular structure with a crystalline multiwall and have a length of several hundred nanometers after nitrogen doping. XRD findings demonstrate that the crystalline structure of NTNTs was dominated by anatase, which is favored for photocatalytic application. The Ti-O-N linkage observed in the XPS N1s spectrum is mainly responsible for narrowing the band gap and eventually enhancing the visible light photoactivity. After sintering at 350 °C, the UVvis absorbance edges of NTNTs significantly shift to the visible-light region, which indicates N atom doping into the nanotubes. Photocatalytic tests conclude that the NTNTs shows good efficiency with visible light response.