Synthesis of Pr 3+ -doped WO 3 particles: correlation between photoluminescent and photocatalytic properties.

Autor: Lovisa LX; Special Coordination of Materials Engineering, Federal University of Santa Catarina Blumenau Santa Catarina Brazil laura.lovisa@ufsc.br., Dos Santos DF; Department of Materials Engineering, LSQM - Laboratory of Chemical Synthesis of Materials, Federal University of Rio Grande do Norte P. O. Box 1524 59078-900 Natal RN Brazil., Santiago AAG; Department of Materials Engineering, LSQM - Laboratory of Chemical Synthesis of Materials, Federal University of Rio Grande do Norte P. O. Box 1524 59078-900 Natal RN Brazil., Teodoro MD; Department of Physics, Federal University of São Carlos São Carlos São Paulo 13565-905 Brazil., Bomio MRD; Department of Materials Engineering, LSQM - Laboratory of Chemical Synthesis of Materials, Federal University of Rio Grande do Norte P. O. Box 1524 59078-900 Natal RN Brazil., Motta FV; Department of Materials Engineering, LSQM - Laboratory of Chemical Synthesis of Materials, Federal University of Rio Grande do Norte P. O. Box 1524 59078-900 Natal RN Brazil.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 Aug 29; Vol. 13 (37), pp. 25738-25751. Date of Electronic Publication: 2023 Aug 29 (Print Publication: 2023).
DOI: 10.1039/d3ra05136f
Abstrakt: The WO 3 and WO 3 :Pr 3+ particles were successfully synthesized by the co-precipitation method. The XRD analysis with Rietveld refinement revealed the formation of a monoclinic phase for WO 3 and for doped samples, this result was later confirmed by Raman spectroscopy studies. The presence of Pr 3+ in the WO 3 crystalline lattice induced structural and optical changes in the particles, increasing the crystallite size, distorting the clusters (shortening of the W-O bonds), favoring the crystallinity and changing the optical gap. The predominant morphology of the particles of WO 3 and WO 3 :Pr 3+ obtained was nanocubes constituted by the superposition of plates of nanometric thicknesses. The photoluminescence of WO 3 and WO 3 :Pr 3+ was produced by the existence of surface defects in the particles. The increase in the concentration of Pr 3+ promoted an increase in the intensity of PL, due to the increase in the rate of recombination of electron/hole charges. The WO 3 sample exhibited emission in the white region due to the adjustment of simultaneous electronic transitions in the blue, green and red regions, characteristic of the broadband spectrum. The interval of the 2.65 eV gap band and the high efficiency in the separation of the photogenerated charges (e - /h + ) with the low recombination rate contributed to the photocatalytic degradation of Crystal Violet (CV) by the catalyst. The WO 3 :4% Pr 3+ sample showed the best photocatalytic efficiency, degrading 73% of the CV dye in 80 minutes. This result was associated with a reduction in particle size and density of oxygen vacancies on the material surface.
Competing Interests: There is no interest that directly and/or indirectly influences the work on the part of the authors that could compromise the appreciation of the work.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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