Zn- vs Bi-based oxides for o-toluidine photocatalytic treatment under solar light

E. Pargoletti, S. Mostoni, G. Rassu, V. Pifferi, D. Meroni, L. Falciola, E. Davoli, M. Marelli, G. Cappelletti

Research output: Contribution to journalArticlepeer-review


The photodegradation of the highly toxic o-toluidine pollutant was deeply investigated both under UV and solar irradiations by using three different semiconductors: pure ZnO, Bi-impregnated ZnO, and Bi2O3 nanopowders (synthesized by precipitating method). All the samples were deeply characterized on structural, morphological, surface, and optical points of view. The disappearance and the relative mineralization of o-toluidine molecules were followed by linear sweep voltammetry (LSV) and total organic carbon (TOC) determinations, respectively. Hence, correlations between their physico-chemical properties and the photocatalytic performances, passing from UV to solar light, were drawn and a hypothesis on the photodegradation mechanism has been proposed, on the basis of the HPLC/MS results. Bare Bi2O3 samples, due to the exploitation of both their visible light absorption and the negligible intermediates formation, resulted to be higher performing under solar irradiation than either pure or Bi-doped ZnO nanopowders. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)8287-8296
Number of pages10
JournalEnvironmental Science and Pollution Research
Issue number9
Publication statusPublished - Mar 1 2017


  • Bismuth doping
  • Bismuth oxide
  • o-Toluidine
  • Photodegradation
  • UV/solar irradiations
  • Zinc oxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis


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