Nb,F-codoped TiO2 hollow spheres with high visible light photocatalytic activity |
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| Authors: | Mingqi Gao Youlong Xu Yang Bai Fang Xiao |
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| Affiliation: | 1.Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi''an Jiaotong University, Xi''an 710049, China |
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| Abstract: | Nb, F-codoped TiO2 hollow spheres (NFTSs) were successfully synthesized via a hydrothermal method with niobium oxide, hydrofluoric acid, and tetrabutyl titanate. The obtained spheres were hollow, with a diameter of about 2 μm, and the sphere wall was made up of nanorods arranged close together. The NFTSs presented anatase phase with more {001} facets exposed, which could be mainly attributed to F ions which were preferentially adsorbed on the {001} facets during the crystal growth process. Ti3+ states in NFTSs were increased due to Nb, F-codoping, resulting in the decrease of the band gap and the red shift of the absorption edge of the NFTSs. The NFTSs exhibited 20.1% higher photocatalytic speed compared to P25 on the degradation of methylene orange. |
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| Keywords: | Photocatalytic activity, Sol– gel preparation, Nb, F-codoping, TiO2, Solar energy materials, Hollow sphere |
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