title: [Fabrication and photocatalytic activity of Pt-inserted titania nanotubes].
abstract: Titania nanotubes (TNTs) were synthesized by hydrothermal treatment of rutile-phase TiO2 nanoparticals in NaOH solution at 110 degrees C for 24 hours. After drying in aceton for 36 h, the TNTs were under vacuum drying for 24 h at room temperature. The Pt-inserted titania nanotubes (Pt/TNTs) were obtained by filling H2 PtCl6 ethanol solution into the TNTs after vacuum drying. The characterizations of the as-synthesized samples were confirmed by TEM, XRD, and UV-Vis. The photocatalytic activity of the Pt/TNTs was investigated by photo-induced decomposition of methyl orange(MO)under the main 365 nm UV-light. In order to comparison, the photocatalytic activity of both the rutile-phase TiO2 nanoparticles and pure TNTs were also investigated at the same time under the same experimental conditions. The TEM images show that the TNTs are hollow, a few hundred nanometers long, and the inner/outer diameter is about 6/10 nm. The crystal structure of TNTs is H2Ti2O5 x H2O with a little Na. Both the shape and the crystalline of the TNTs are not changed after the modification. The oval or round Pt0 nanoparticals, about 3 nm in diameter, are found only in the nanotubes. Pt/TNTs exhibit enhanced absorption at the visible range in the UV-Vis spectra and its start absorption band edge(lambda0 approximately 457 nm)is obviously redshifted compared to the rutile-phase TiO2 nanoparticals and pure TNTs. The Pt nanoparticles are found to significantly enhance the photocatalytic activity of TNTs. Pt/TNTs are demonstrated to be highly efficient for the UV-light induced photocatalytic decomposition of MO compared to both the rutile-phase TiO2 nanoparticals and pure TNTs. After irradiation for 60 min, the photocatalysis decomposition rate of MO in rutile-phase TiO2 nanoparticals, TNTs and Pt/TNTs are 46.8%, 57.2% and 84.6% respectively.
authors.affiliation: Beijing National Laboratory for Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. lihl@pku.edu.cn
authors.forename: Hai-Long
authors.initials: HL
authors.lastname: Li
authors.forename: Wu-Lin
authors.initials: WL
authors.lastname: Luo
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: Tian
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Chun
authors.initials: C
authors.lastname: Li
authors.forename: Mao
authors.initials: M
authors.lastname: Sun
authors.forename: Di
authors.initials: D
authors.lastname: Zhu
authors.forename: Ran-Ran
authors.initials: RR
authors.lastname: Liu
authors.forename: Yu-Liang
authors.initials: YL
authors.lastname: Zhao
authors.forename: Chun-Li
authors.initials: CL
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D046529:Microscopy, Electron, Transmission; D043942:Nanotubes / Q000737:chemistry*; D055668:Photochemical Processes; D010984:Platinum / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C009495:titanium dioxide; D010984:Platinum; D014025:Titanium