TiO2/WO3/Au nanoarchitectures' photocatalytic activity, "from degradation intermediates to catalysts' structural peculiarities", Part I: Aeroxide P25 based composites

G. Kovács, L. Baia, A. Vulpoi, T. Radu, É Karácsonyi, A. Dombi, K. Hernádi, V. Danciu, S. Simon, Zs Pap

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23 Citations (Scopus)

Abstract

The "build-up" methodology of a composite photocatalyst is a critical issue regarding the showed photocatalytic performance, including the formation of intermediates. To investigate this issue P25/WO3/Au composites were obtained by impregnation (WO3) and subsequent photoreduction (Au) with UV or visible light. The obtained composites' photocatalytic activity and intermediate formation profiles were evaluated using phenol as a model pollutant. XPS/UPS and DRS methods were used to uncover local coordination, surface chemistry (of the different types of atoms (Ti, W, O and Au) and the band-structure (band-gap, possible electron transitions) of the obtained nanomaterials. The intermediates' evolution profile and structural peculiarities were successfully correlated and it was shown that each minor structural (bulk or surface) change has a significant impact on the photocatalytic activity and intermediate formation dynamics.

Original languageEnglish
Pages (from-to)508-517
Number of pages10
JournalApplied Catalysis B: Environmental
Volume147
DOIs
Publication statusPublished - Apr 5 2014

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Keywords

  • Aeroxide P25
  • Gold nanoparticles
  • Phenol
  • Tungsten(VI) oxide
  • UV photodegradation intermediates

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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