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Latvian Journal of Physics and Technical Sciences

The Journal of Institute of Physical Energetics

6 Issues per year


CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2015: 0.174
Source Normalized Impact per Paper (SNIP) 2015: 0.332

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0868-8257
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Volume 50, Issue 4 (Aug 2013)

Issues

Photocatalitic Properties of Tio2 and ZnO Nanopowders / Tio2 un Zno Nanopulveru Fotokatalitiskās Īpašības

L. Grigorjeva
  • Corresponding author
  • Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063, Riga, LATVIA
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/ J. Rikveilis
  • Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063, Riga, LATVIA
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/ J. Grabis
  • Institute of Inorganic Chemistry, Riga Technical University 34 Miera Str., Salaspils, LV-2169, LATVIA
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/ Dz. Jankovica
  • Institute of Inorganic Chemistry, Riga Technical University 34 Miera Str., Salaspils, LV-2169, LATVIA
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/ C. Monty / D. Millers
  • Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063, Riga, LATVIA
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/ K. Smits
  • Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063, Riga, LATVIA
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Published Online: 2013-09-17 | DOI: https://doi.org/10.2478/lpts-2013-0025

Abstract

Photocatalytic activity of TiO2 and ZnO nanopowders is studied depending on the morphology, grain sizes and method of synthesizing. Photocatalysis of the prepared powders was evaluated by degradation of the methylene blue aqueous solution. Absorbance spectra (190-100 nm) were measured during exposure of the solution to UV light. The relationships between the photocatalytic activity and the particle size, crystal polymorph phases and grain morphology were analyzed. The photocatalytic activity of prepared TiO2 nanopowders has been found to depend of the anatase-to-rutile phase ratio. Comparison is given for the photocatalytic activity of ZnO nanopowders prepared by sol-gel and solar physical vapour deposition (SPVD) methods

Kopsavilkums

Darbā pētīta fotokatalīzes efektivitāte ar dažādām metodēm sintezētiem TiO2 and ZnO nanopulveriem, kuriem ir atšķirīga morfoloģija un grauda izmērs. Foto katalīzes process raksturots ar metilenzilā sagraušanu ūdens šķīdumā, to apstarojot ar UV gaismu. Analizēta fotokatalīzes efektivitātes atkarība no grauda izmēra, nanokristālu graudu morfoloģijas, TiO2 nanopulveru anatasa-rutīla fāžu svara attiecībām. Parādīts, ka fotokatalītiskā efektivitāte ir atšķirīga TiO2 nanopulveriem sintezētiem ar dažādām metodēm: sola-gēla un tvaicēšanu-kondensēšanu saules reaktorā. Salīdzināta fotokatalīzes efektivitāte ZnO un TiO2 nanopulveriem un secināts, ka ZnO nanopulveri ar tetrapodu morfoloģiju ir labs fotokatalizators

Keywords : photocatalysis; photocatalytic activity; ZnO; TiO2; nanopowders

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About the article

Published Online: 2013-09-17

Published in Print: 2013-08-01


Citation Information: Latvian Journal of Physics and Technical Sciences, ISSN (Print) 0868-8257, DOI: https://doi.org/10.2478/lpts-2013-0025.

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