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    • Keywords

       

      Titania nanoparticles; ball milling; photo-catalytic properties; photo-generated radicals; electronic paramagnetic resonance spectroscopy.

    • Abstract

       

      Commercial PC105 titanium dioxide nanoparticles were studied under mechanical milling process. The effect of milling time and speed on the structural and electronic properties of TiO$_2$ powder was then investigated using X-raypowder diffraction (XRD), dynamic light scattering (DLS), transmission electronic microscopy (TEM), electron paramagnetic resonance (EPR) and UV–visible spectroscopy. The related photo-catalytic properties of the milled nanoparticleswere probed following the degradation rate of methylene orange (MO) under UV-light irradiation and through EPR spinscavenging approach. Comparison with pristine powder shows that milled nanoparticles are significantly less reactive upon illumination, despite decreased radius and hence, higher specific area. Such low yield of reactive species is attributed to the apparition of the amorphous TiO$_2$ and brookite phase upon milling, as well as increased charge carrier recombination as pointed out by the presence of sacrificial electron donor.

    • Author Affiliations

       

      YOUCEF MESSAI1 2 BERTRAND VILENO2 3 DAVID MARTEL4 PHILIPPE TUREK2 3 DJAMEL EDDINE MEKKI1

      1. Laboratoire d’Etude des Surfaces et Interfaces de la Matière Solide (LESIMS), Université Badji Mokhtar, 23000 Annaba, Algeria
      2. Institut de Chimie (UMR 7177, CNRS-Unistra), Université de Strasbourg, 1 rue Blaise Pascal, CS 90032, 67081 Strasbourg Cedex, France
      3. French EPR Federation of Research (REseau NAtional de RPEinterDisciplinaire (RENARD), Fédération IR-RPE CNRS #3443), Strasbourg, France
      4. CNRS, Institut Charles Sadron, Université de Strasbourg, 23 rue du Loess, 67000 Strasbourg, France
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