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Photocatalytic behavior of nanosized TiO2 immobilized on layered double hydroxides by delamination/restacking process

Abstract

Introduction

Efficient immobilization of TiO2 nanoparticles on the surface of Mg2Al-LDH nanosheets was performed by delamination/restacking process.

Experimental part

The structural and textural properties of as-prepared nanocomposite were deeply analyzed using different solid-state characterization techniques such as: X-ray powder diffraction, Fourier transform infrared spectroscopy, and Raman spectroscopies, chemical analysis, X-ray photoelecton spectroscopy, N2 adsorption–desorption, and electronic microscopy.

Results and discussion

The photocatalytic properties of immobilized TiO2 nanoparticles on Mg2Al were investigated using the photodegradation of two model pollutants: Orange II and 4-chlorophenol, and compared with pure colloidal TiO2 solution.

Conclusion

It appears that Orange II photodegradation was systematically faster and more efficient than 4-chlorophenol photodegradation regardless of the medium pH. Moreover under slightly basic conditions, even if the TiO2 photocatalytic efficiency decreases, photodegradation performed in presence of easily recovered TiO2/Mg2Al1.5 nanocomposite gives rise to comparable or better results than pure TiO2.

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Acknowledgment

Financial support from French Embassy in the Czech Republic for the stays of Šárka Paušová in Clermont-Ferrand is gratefully acknowledged. The authors thank CRIC (Ottawa) for XPS facilities and the MEYS of the Czech Republic (project 1M0577) for partial financial support.

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Correspondence to Josef Krýsa or Vanessa Prevot.

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Responsible editor: Philippe Garrigues

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Paušová, Š., Krýsa, J., Jirkovský, J. et al. Photocatalytic behavior of nanosized TiO2 immobilized on layered double hydroxides by delamination/restacking process. Environ Sci Pollut Res 19, 3709–3718 (2012). https://doi.org/10.1007/s11356-012-0780-9

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  • DOI: https://doi.org/10.1007/s11356-012-0780-9

Keywords

  • Photocatalysis
  • Layered double hydroxide
  • Delamination
  • TiO2 nanoparticles
  • Orange II
  • 4-Chlorophenol