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Title: Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties

Abstract

Graphical abstract: Thermal plasma synthesized nanophase zirconia showing the blue shift in the band gap of monoclinic phase as found from the photoabsorption spectroscopy was found to be the dominant parameter for the enhancement in its photocatalytic activity. The existence of different defect states and their concentration in as synthesized samples also inferred from the photoabsorption measurements were also found to be responsible for the enhanced photocatalytic activity of the samples. Highlights: ► Phase controlled structural formation of nanophase ZrO{sub 2} by thermal plasma route. ► Enhanced photocatalytic degradation rate of methylene blue dye. ► The blue shift in the band gap of monoclinic phase of nanocrystalline ZrO{sub 2}. ► Existence of different defect states in the as synthesized nano phase ZrO{sub 2}. ► Several competing processes which controls the photocatalytic degradation rate. -- Abstract: The photocatalytic activity of pure ZrO{sub 2} samples, prepared by a thermal plasma route, and characterized by X-ray diffraction technique was tested for the degradation of methylene blue, which is known to be a hazardous dye. Although, all these samples synthesized at different operating pressures of the thermal plasma reactor showed the photocatalytic activity; the sample synthesized at 1.33 bar of operating pressure showed themore » highest photocatalytic activity. The blue shift in the band gap of monoclinic phase, as observed from the photo-absorption spectroscopy, may be attributed to the enhanced photocatalytic activity. The existence of different defect states and their concentration as, inferred from the photo-absorption measurements were also found to be responsible for the enhanced photocatalytic activity of the as synthesized samples.« less

Authors:
; ;  [1];  [1];  [2]
  1. Department of Physics, University of Pune, Pune 411007 (India)
  2. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
Publication Date:
OSTI Identifier:
22215583
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; ABSORPTION SPECTROSCOPY; CRYSTALS; DEFECTS; METHYLENE BLUE; MONOCLINIC LATTICES; NANOSTRUCTURES; PARTICLES; PHOTOCATALYSIS; PLASMA; X-RAY DIFFRACTION; ZIRCONIUM OXIDES

Citation Formats

Nawale, Ashok B., Kanhe, Nilesh S., Bhoraskar, S.V., Mathe, V.L., E-mail: vlmathe@physics.unipune.ac.in, and Das, A.K. Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.07.010.
Nawale, Ashok B., Kanhe, Nilesh S., Bhoraskar, S.V., Mathe, V.L., E-mail: vlmathe@physics.unipune.ac.in, & Das, A.K. Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties. United States. doi:10.1016/J.MATERRESBULL.2012.07.010.
Nawale, Ashok B., Kanhe, Nilesh S., Bhoraskar, S.V., Mathe, V.L., E-mail: vlmathe@physics.unipune.ac.in, and Das, A.K. Thu . "Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties". United States. doi:10.1016/J.MATERRESBULL.2012.07.010.
@article{osti_22215583,
title = {Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties},
author = {Nawale, Ashok B. and Kanhe, Nilesh S. and Bhoraskar, S.V. and Mathe, V.L., E-mail: vlmathe@physics.unipune.ac.in and Das, A.K.},
abstractNote = {Graphical abstract: Thermal plasma synthesized nanophase zirconia showing the blue shift in the band gap of monoclinic phase as found from the photoabsorption spectroscopy was found to be the dominant parameter for the enhancement in its photocatalytic activity. The existence of different defect states and their concentration in as synthesized samples also inferred from the photoabsorption measurements were also found to be responsible for the enhanced photocatalytic activity of the samples. Highlights: ► Phase controlled structural formation of nanophase ZrO{sub 2} by thermal plasma route. ► Enhanced photocatalytic degradation rate of methylene blue dye. ► The blue shift in the band gap of monoclinic phase of nanocrystalline ZrO{sub 2}. ► Existence of different defect states in the as synthesized nano phase ZrO{sub 2}. ► Several competing processes which controls the photocatalytic degradation rate. -- Abstract: The photocatalytic activity of pure ZrO{sub 2} samples, prepared by a thermal plasma route, and characterized by X-ray diffraction technique was tested for the degradation of methylene blue, which is known to be a hazardous dye. Although, all these samples synthesized at different operating pressures of the thermal plasma reactor showed the photocatalytic activity; the sample synthesized at 1.33 bar of operating pressure showed the highest photocatalytic activity. The blue shift in the band gap of monoclinic phase, as observed from the photo-absorption spectroscopy, may be attributed to the enhanced photocatalytic activity. The existence of different defect states and their concentration as, inferred from the photo-absorption measurements were also found to be responsible for the enhanced photocatalytic activity of the as synthesized samples.},
doi = {10.1016/J.MATERRESBULL.2012.07.010},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}