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Author Kou, Yanqiang ♦ Yang, Jikai ♦ Li, Bing ♦ Fu, Shencheng
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ABSORPTION SPECTRA ♦ COMPARATIVE EVALUATIONS ♦ DOPED MATERIALS ♦ EMISSION SPECTRA ♦ HOLES ♦ IRRADIATION ♦ METHYLENE BLUE ♦ PHOTOCATALYSIS ♦ PHOTOLUMINESCENCE ♦ POROUS MATERIALS ♦ PYROLYSIS ♦ RECOMBINATION ♦ RED SHIFT ♦ SCANNING ELECTRON MICROSCOPY ♦ TITANIUM OXIDES ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ TUNGSTEN OXIDES ♦ VISIBLE RADIATION ♦ VISIBLE SPECTRA ♦ X-RAY DIFFRACTION
Abstract Highlights: • Nb-TiO{sub 2}/WO{sub 3} was prepared by USP method combined impregnation method. • Nb-doping extend the spectral absorption of TiO{sub 2} into visible spectrum. • Nb-TiO{sub 2}/WO{sub 3} has a similar optical band gap as Nb-TiO{sub 2}. • PL spectra indicate WO{sub 3} can accept the photoexcited electrons from Nb-TiO{sub 2}. • Nb-TiO{sub 2}/WO{sub 3} shows higher activity than TiO{sub 2} and Nb-TiO{sub 2} under solar light. - Abstract: Nb doped TiO{sub 2} microspheres modified with WO{sub 3} (Nb-TiO{sub 2}/WO{sub 3}) was prepared by ultrasonic spray pyrolysis method combined with impregnation method. The microspheres were characterized with SEM, TEM, XRD, BET, photoluminescence and UV–vis absorption spectra. The Nb-doping was observed to extend the spectral absorption of TiO{sub 2} into visible spectrum, and the absorption onset was red-shifted for about 88 nm compared to pristine TiO{sub 2} microspheres. Nb-TiO{sub 2}/WO{sub 3} microspheres do not display a red-shifted absorption edge compared with Nb doped TiO{sub 2} microspheres. Under solar irradiation, Nb-TiO{sub 2}/WO{sub 3} microspheres showed higher photocatalytic activity for methylene blue degradation compared with that of pure TiO{sub 2} microspheres and Nb doped TiO{sub 2} microspheres, which could be ascribed to the extended light absorption range and the suppression of electron-hole pair recombination.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-03-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 63


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