title: Fabrication and enhanced visible light photocatalytic activity of fluorine doped TiO2 by loaded with Ag.
abstract: F-doped TiO2 loaded with Ag (Ag/F-TiO2) was prepared by sol-gel process combined with photoreduction method. The physical and chemical properties of the prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). XPS analysis indicated Ag species existed as Ag0 in the structure of Ag/F-TiO2 samples. UV-Vis diffuse reflectance spectra showed that the light absorption of Ag/F-TiO2 in the visible region had a significant enhancement compared with the F-doped TiO2 (F-TiO2). PL analysis indicated that the electron-hole recombination rate had been effectively inhibited when Ag loaded on the surface of F-TiO2. The photocatalytic activities of the samples were evaluated for the degradation of X-3B (Reactive Brilliant Red dye, C.I. reactive red 2) under visible light (lambda > 420 nm) irradiation. Compared with F-TiO2, the sample of 0.50 Ag/F-TiO2 showed the highest photocatalytic activity. The interaction between F species and metallic Ag was responsible for improving the visible light photocatalytic activity.
authors.affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Lin
authors.forename: Fei
authors.initials: F
authors.lastname: Rong
authors.forename: Xiang
authors.initials: X
authors.lastname: Ji
authors.forename: Degang
authors.initials: D
authors.lastname: Fu
authors.forename: Chunwei
authors.initials: C
authors.lastname: Yuan
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D009282:Naphthalenesulfonates / Q000737:chemistry; D055668:Photochemical Processes; D018030:Silver Compounds / Q000737:chemistry*; D013057:Spectrum Analysis; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D009282:Naphthalenesulfonates; C520101:Reactive brilliant red X-3B; D018030:Silver Compounds; C009495:titanium dioxide; C105022:silver fluoride; D014025:Titanium; D005459:Fluorides