Effects of annealing on the microstructures and photoactivity of fluorinated N-doped TiO2
- 18 August 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 12 (38), 12308-12315
- https://doi.org/10.1039/c0cp00036a
Abstract
We investigated the effects of annealing in air on fluorinated N-doped TiO2 (F/N–TiO2) photocatalysts prepared by hydrothermal process. The textural properties (specific surface areas) and surface properties (surface defect density, surface Ti–F density) were significantly modified upon annealing. In contrast, due to the shielding effect of surface fluorination, the phase transformation from anatase to rutile as well as removal of N-dopants during annealing was greatly inhibited. The evolution of the chemical nature of doped nitrogen species upon annealing in air was investigated and correlated with the generation and annihilation of oxygen deficiency. The defect density dominated the visible-light absorption and production of active ˙OH. The textural properties and the surface characteristics were crucial for UV-light photocatalytic performance, while the visible-light photocatalytic activity was mainly associated with the defect density. The 300 °C-annealed F/N–TiO2 sample showed considerable photocatalytic activity under both UV and visible-light irradiation.Keywords
This publication has 45 references indexed in Scilit:
- Synergetic Codoping in Fluorinated Ti1−xZrxO2 Hollow MicrospheresThe Journal of Physical Chemistry C, 2009
- Boron and nitrogen co-doped titania with enhanced visible-light photocatalytic activity for hydrogen evolutionApplied Surface Science, 2008
- Synthesis and solid characterization of nitrogen and sulfur-doped TiO2 photocatalysts active under near visible lightMaterials Letters, 2008
- Microstructures and photoactivity of mesoporous anatase hollow microspheres fabricated by fluoride-mediated self-transformationJournal of Catalysis, 2007
- Novel Carbon-Doped TiO2 Nanotube Arrays with High Aspect Ratios for Efficient Solar Water SplittingNano Letters, 2005
- Photoinduced reactivity of titanium dioxideProgress in Solid State Chemistry, 2004
- The design and development of highly reactive titanium oxide photocatalysts operating under visible light irradiationJournal of Catalysis, 2003
- Effects of F- Doping on the Photocatalytic Activity and Microstructures of Nanocrystalline TiO2 PowdersChemistry of Materials, 2002
- Visible-Light Photocatalysis in Nitrogen-Doped Titanium OxidesScience, 2001
- Environmental Applications of Semiconductor PhotocatalysisChemical Reviews, 1995