title: Low temperature fabrication of V-doped TiO2 nanoparticles, structure and photocatalytic studies.
abstract: V-doped TiO(2)nanoparticles were synthesized at low temperature and characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), transmission electron microscopy (TEM), Brunauer-Emmet-Teller (BET), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy, and photoluminescence (PL) spectroscopy, respectively. It is found the nanoparticle shape changed from needle, to short stick and then to cubic with the increase of doped V concentration, which was also accompanied by the improvement of crystallinity. The specific surface area (S(BET)) decreased with increasing V content. It is confirmed that V ions can be doped in TiO(2) by substituting Ti(4+) ions, which suppressed the CB --> VB and surface recombination of photoinduced electrons and holes, and a relation was found between the PL spectra and the UV photocatalytic activity. There was an optimum V content for the V-doped TiO(2) to present the best UV-light induced photoactivity, but they were visible-inactive. At last, the effect of the doping V as trapping centers on photocatalysis was investigated in detail, and used to explain the difference between the photocatalysis under the illumination of UV light and visible light.
authors.affiliation: Key Laboratory of Silicate Materials Science and Engineering, Ministry of Education, Wuhan University of Technology, Wuhan City, Hubei Province, PR China. liubaoshun@yahoo.com
authors.forename: Baoshun
authors.initials: B
authors.lastname: Liu
authors.forename: Xuelai
authors.initials: X
authors.lastname: Wang
authors.forename: Guofa
authors.initials: G
authors.lastname: Cai
authors.forename: Liping
authors.initials: L
authors.lastname: Wen
authors.forename: Yanbao
authors.initials: Y
authors.lastname: Song
authors.forename: Xiujian
authors.initials: X
authors.lastname: Zhao
mesh_terms: D002384:Catalysis; D003080:Cold Temperature; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014639:Vanadium / Q000737:chemistry*
chemical_list: D014639:Vanadium; C009495:titanium dioxide; D014025:Titanium