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Title: Solar photocatalytic activities of porous Nb-doped TiO{sub 2} microspheres by coupling with tungsten oxide

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-holemore » pair recombination.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. School of Science, Changchun University of Science and Technology, 7089 Weixing Road, Changchun 130022 (China)
  2. College of physics, Changchun Normal University, Changchun 130012 (China)
Publication Date:
OSTI Identifier:
22420832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 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