Photo-initiated reactions of 2,4,6 TCP on Degussa P25 formulation TiO{sub 2} : wavelength sensitive decomposition.

Journal Article · Thu Oct 21 00:00:00 EDT 2004 · J. Phys. Chem. B

DOI:https://doi.org/10.1021/jp047097m· OSTI ID:961470

Hurum, D C; Gray, K A; Rajh, T; Thurnauer, M C

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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961470
• Report Number(s): ANL/CHM/JA-48086
• Journal Information: J. Phys. Chem. B, Journal Name: J. Phys. Chem. B Journal Issue: 42 ; Oct. 21, 2004 Vol. 108; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
DECOMPOSITION
FREQUENCY DEPENDENCE
PHOTOCHEMISTRY
RADICALS
REACTION KINETICS
TCP
WAVELENGTHS