Journal
CHEMICAL ENGINEERING JOURNAL
Volume 162, Issue 2, Pages 710-717Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.06.030
Keywords
Titania miscrosphere; Nitrogen and fluorine codoping; Photocatalysis; Visible light
Categories
Funding
- National Nature Science Foundation of China [20773039, 20977030]
- National Basic Research Program of China (973 Program) [2007CB613301, 2010CB732306]
- Science and Technology Commission of Shanghai Municipality [10520709900]
- Fundamental Research Funds for the Central Universities
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N and F-codoped TiO2 microspheres were prepared by ethanol solvothermal method, using tetrabutyl titanate as precursor, urea as a nitrogen source and ammonium fluoride as a fluorine source. The prepared catalysts were characterized by X-ray diffraction (XRD). N-2 physical adsorption, scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS), ultraviolet-visible adsorption spectroscopy and photoluminescence spectra (PL). The photocatalytic performance of N-F-TiO2 microspheres was evaluated by analyzing the degradation of acid orange 7 (AO7) under visible light irradiation. It was found that N-F-TiO2 microsphere with mesoporous structure is composed by anatase phase, and the interstitial doping of nitrogen into TiO2 lattice might be responsible for the visible light response. Meanwhile, F-doping could not only retard the transformation from anatase to rutile, but also increase the concentration of OH center dot radicals in solution, which is beneficial for improving the photodegradation rate of organic compounds. The synergetic effect of nitrogen and fluorine doping leads to the high activity of N-F-TiO2 for the photodegradation of AO7 under visible light irradiation. (C) 2010 Elsevier B.V. All rights reserved.
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