Photoinitiated reactions of 2,4,6 TCP on degussa P25 formulation TiO 2: Wavelength-sensitive decomposition

Deanna C. Hurum, Kimberly A Gray*, Tijana Rajh, Marion C. Thurnauer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The photoinitiated oxidative reactions of 2,4,6 trichlorophenol (2,4,6 TCP) and 2,4,5 trichlorophenol (2,4,5 TCP) are studied on the titania photocatalyst Degussa P25. On this catalyst 2,4,6 TCP is used to confirm two distinct oxidative mechanisms that are triggered at different light-excitation wavelengths. A charge-transfer mechanism occurs at sub-bandgap energies of the photocatalyst leading to a phenoxyl radical product and an oxidative mechanism occurs at the bandgap leading to a semiquinone radical product. The wavelength dependence of these two mechanisms is discussed.

Original languageEnglish (US)
Pages (from-to)16483-16487
Number of pages5
JournalJournal of Physical Chemistry B
Volume108
Issue number42
DOIs
StatePublished - Oct 21 2004

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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