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Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity

  • Malgorzata Aleksandrzak , Magdalena Onyszko , Beata Zielińska and Ewa Mijowska
Published/Copyright: September 15, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 9

Abstract

TiO2-reduced graphene oxide nanocomposites with different diameters and crystallinity of titania nanoparticles were synthesized via the sol-gel method followed by calcination in air or treatment under vacuum. The materials were characterized with transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence spectroscopy and diffuse-reflectance UV–vis spectroscopy. The photocatalytic activity of the resulting materials was examined in the process of phenol decomposition under UV–vis light irradiation. The influences of TiO2 loading and calcination treatment on photocatalytic activity of the composites were investigated. It was found that higher TiO2 concentrations resulted in higher photocatalytic activity. This is in agreement with the band gap energy values, as lower visible light absorption and higher Eg values were obtained for the samples prepared with higher TiO2 loading. Furthermore, photoactivity was affected by the calcination treatment. Higher activity under UV–vis was shown by the samples calcinated under vacuum, which was attributed to the better crystallinity compared to the samples treated with air.

Keywords: Graphene; TiO2; Nanocomposites; Photocatalysis
* Correspondence address, Malgorzata Aleksandrzak, M.Sc., West Pomeranian University of Technology, Institute of Chemical and Environment Engineering, Pulaskiego 10, 70-322, Szczecin, Poland, Tel.: +48 914494269, Fax: +48 914494686, E-mail:

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Received: 2013-12-19
Accepted: 2014-04-03
Published Online: 2014-09-15
Published in Print: 2014-09-15

© 2014, Carl Hanser Verlag, München

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  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
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https://doi.org/10.3139/146.111102
Keywords for this article
Graphene; TiO2; Nanocomposites; Photocatalysis

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
  6. Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
  8. Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
  9. Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
  10. Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
  11. Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
  12. Lüders effect in Al 99.7% extruded via the KoBo method
  13. Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
  14. Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
  15. X-ray stress measurement with two-dimensional detector based on Fourier analysis
  16. People
  17. People
  18. People
  19. DGM News
  20. Personal
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