Open Access Nano Express

Nb, F-codoped TiO2 hollow spheres with high visible light photocatalytic activity

Mingqi Gao, Youlong Xu*, Yang Bai and Fang Xiao

Author Affiliations

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, China

For all author emails, please log on.

Nanoscale Research Letters 2013, 8:508  doi:10.1186/1556-276X-8-508

Published: 4 December 2013

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.

Keywords:
Photocatalytic activity; Sol–gel preparation; Nb, F-codoping; TiO2; Solar energy materials; Hollow sphere