TiO2 nanopowders doped with boron and nitrogen for photocatalytic applications (Articolo in rivista)

Type
Label
  • TiO2 nanopowders doped with boron and nitrogen for photocatalytic applications (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.chemphys.2007.05.024 (literal)
Alternative label
  • V. Gombac; L. De Rogatis; A. Gasparotto; G. Vicario; T. Montini; D. Barreca; G. Balducci; P. Fornasiero; E. Tondello; M. Graziani (2007)
    TiO2 nanopowders doped with boron and nitrogen for photocatalytic applications
    in Chemical physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • V. Gombac; L. De Rogatis; A. Gasparotto; G. Vicario; T. Montini; D. Barreca; G. Balducci; P. Fornasiero; E. Tondello; M. Graziani (literal)
Pagina inizio
  • 111 (literal)
Pagina fine
  • 123 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.sciencedirect.com/science/article/pii/S0301010407001991 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 339 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 13 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1,2,4,5,7,8,10 :Chemistry Department, INSTM - Trieste, Center of Excellence for Nanostructured Materials, University of Trieste, Trieste, Italy / 3,9 : Chemistry Department, University of Padova and INSTM, Padova, Italy / 6 : ISTM-CNR and INSTM, Chemistry Department, University of Padova, Padova, Italy (literal)
Titolo
  • TiO2 nanopowders doped with boron and nitrogen for photocatalytic applications (literal)
Abstract
  • TiO2-based systems have attracted an increasing interest for their potential use as photocatalysts under visible-light irradiation. In this context, the present work was dedicated to the tailored synthesis of TiO2 nanopowders doped with boron, nitrogen or both species for the photocatalytic degradation of organic dyes. In particular, the systems were synthesized by a sol-gel route starting from titanium(IV) butoxide as a Ti source and thoroughly characterized by the combined use of N2 physisorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis reflectance spectroscopy and temperature-programmed oxidation (TPO). Finally, the photocatalytic performances in the decomposition of the azo-dye methyl orange (MO) were investigated. The obtained results suggest that both dopants promote the photocatalytic activity with respect to pure TiO2 systems. Nevertheless, while our surface N-doping does not appreciably modify the titania structure and texture, B incorporation inhibits the TiO2 crystallite growth and induces an increase in the surface area. As regards the codoped systems, a remarkable reactivity improvement was observed only when B is present in excess with respect to N. A rational interpretation of the observed behaviour was attempted by calculations based on the density functional theory (DFT). We suggest that the presence of B in molar excess with respect to N generates reactive Ti(III) sites, which, in turn, might induce the formation of reactive superoxide species. (literal)
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