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Mu K.,Sichuan Agricultural University | Li J.,Sichuan Agricultural University | Zhong J.,Sichuan Agricultural University | Shen F.,Sichuan Agricultural University | And 9 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

TiO2 nanofilms were prepared on Ti substrate by anodic oxidation in ethylene glycol and HNO3 enectrolyte under room temperature. The surface structure of the TiO2 nanofilms was investigated by changing experimental parameters, such as oxidation voltage, oxidation time and annealing temperature. The influence of different conditions on the photoelectrocatalytic activity was analyzed by first-order kinetics model. The morphology and crystal structure of the TiO2 nanofilms were characterized by SEM, XRD.The results show that the anodizing voltage, oxidation time and annealing temperature have a significant effect on the structure and photocatalytic activity of the TiO2 nanofilms. When an anodizing voltage of 40 V, oxidation time of 10 min and annealing treatment of 500℃, 1 h are applied, the TiO2 nanofilms display the highest photoelectrocatalytic activity. ©, 2015, Science Press. All right reserved.

Liu Y.,Sichuan Agricultural University | Mu K.,Sichuan Agricultural University | Zhang Y.,Sichuan Agricultural University | Zhang Y.,Sichuan Engineering and Technical Center for Rural Environmental Protection | And 12 more authors.
International Journal of Hydrogen Energy | Year: 2016

A narrow-gap TiO2 nanofiber film was synthesized on Ti foil by chemical polishing and anodization. The morphology, crystal structure, chemical states, and optical properties were characterized by scanning electron microscopy, X-ray diffraction, X-ray photon electron spectroscopy, and ultraviolet-visible-infrared absorption spectroscopy, respectively. Transient photocurrent response, linear sweep voltammetry, and photoconversion efficiency were also measured. The photocatalytic activity was evaluated from both hydrogen generation and methyl orange degradation experiments. Our results suggested that the film was composed of small uniform TiO2 nanofibers, having interstitial nitrogen-doping, oxygen vacancies and a mixture of anatase and rutile crystal phases. The films exhibited strong and broad optical absorption from 200 to 2500 nm. Owing to this strong absorption and rapid transport of photogenerated electrons, the nanofiber films exhibited a high photoconversion efficiency of 0.62%, and a hydrogen generation rate of 0.62 mL h-1 cm-2 under visible light irradiation. Under solar irradiation the films also showed remarkable efficiency and stability for the degradation of methyl orange. © 2016 Hydrogen Energy Publications, LLC.

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