Journal
APPLIED SURFACE SCIENCE
Volume 280, Issue -, Pages 523-529Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.05.021
Keywords
Anodization; Nitrogen doped TiO2 nanotube arrays; Methyl orange; Photocurrent; Photocatalytic property
Categories
Funding
- National Natural Science Foundation of China [91023030, 51272062, 51128201, 51202052]
- Natural Science Foundation of Anhui Province [1308085QE74]
- Specialized Research Fund for the Doctoral Program of Higher Education [20100111110012]
- International Scientific and Technological Cooperation Project of Anhui Province [10080703017]
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Nitrogen doped TiO2 nanotube arrays (N-TNAs) were prepared by immersing TNAs in 1 M NH3 center dot H2O solution and then annealing in different temperatures. The morphology, structure and composition of the N-TNAs were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy, respectively. Effects of annealing temperatures on structure, photocatalytic properties, and the crystal structure transformation process of the N-TNAs were discussed. Photocatalytic properties of the N-TNAs were evaluated in term of the degradation of methyl orange (MO) under UV light and visible light, and the photocurrent of N-TNAs were tested by electrochemical workstation. The XPS results showed that the N-TNAs were achieved by interstitial doping and substitutional doping, and the FESEM results showed the morphology was not changed after doping process. Compared with the pure TNAs, the N-TNAs annealed at 500 degrees C for 2 h with a mixed phase of anatase and rutile exhibited higher photocatalytic degradation activity to MO. Furthermore, the photocatalytic mechanism of organic pollutants degradation (MO) was discussed based on our experiments. (C) 2013 Elsevier B.V. All rights reserved.
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