| In this article, Fe/C/N, Co/C/N, Ni/C/N doped and undoped TiO2 composite nanofibres were fabricated by electrospining combined with calcining technology using PVP as templates, ethanol and acetic acid as solvant, and isopropyl titanata as resources. The obtained nanofibers were characterized by SEM, TEM, XRD, XPS and EDS, and evaluated in the photodegradation of methylene blue under visible light.It is found that the Fe/C/N-TiO2 nanofibers calciend at 400 ℃ for 1h with Fe/Ti molar ratio of 1.5% show a diameter range of 110±50 nm and a BET area of 127.48 m2·g-1. The Co/C/N-TiO2 nanofibers calcined at 400 ℃ for 1h with Co/Ti molar ratio of 1.0% show a diameter range of 68±17 nm and a BET area of 121.55m2·g-1. The Ni/C/N-TiO2 nanofibers calcined at 400 ℃ for 1h with Ni/Ti molar ratio of 1.0%show a diameter range of 105±45 nm and a BET area of 108.90 m2·g-1. The materials all present an anatase phase, and transition metal, C and N are doped into TiO2 lattice. At the same time, under the visible light irradiation for 2 h, the photoactivity results show that the degradation efficiency of methylene blue over Fe/C/N-TiO2, Co/C/N-TiO2 and Ni/C/N-TiO2 nanofibers is 98.3%,99.3% and 99.8%, respectively. The kinetic constants of TiO2, Fe/C/N-TiO2, Co/C/N-TiO2 and Ni/C/N-TiO2 are 0.0069,0.0351,0.0430 and 0.0491 min-1, respectively. Thus, the photocatalytic performance is in the following order: pure TiO2< Fe/C/N-TiO2< CO/C/N-TiO2< Ni/C/N-TiO2. It is suggested that the prepared nanofibers are good candidate catalysts for removal of organic contamination in water. |
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