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Mechanistic Studies of TiO2 Photocatalysis and Fenton Degradation of Hydrophobic Aromatic Pollutants in Water.
- Source :
-
Chemistry - An Asian Journal . 12/19/2016, Vol. 11 Issue 24, p3568-3574. 7p. - Publication Year :
- 2016
-
Abstract
- HO-adduct radicals have been investigated and confirmed as the common initial intermediates in TiO2 photocatalysis and Fenton degradations of water-insoluble aromatics. However, the evolution of HO-adduct radicals to phenols has not been completely clarified. When 4-d-toluene and p-xylene were degraded by TiO2 photocatalysis and Fenton reactions, respectively, a portion of the 4-deuterium or 4-CH3 group (18-100 %) at the attacked ipso position shifted to the adjacent position of the ring in the formed phenols (NIH shift; NIH is short for the National Institutes of Health, to honor the place where this phenomenon was first discovered). The results, combined with the observation of a key dienyl cationic intermediate by in situ attenuated total reflectance FTIR spectroscopy, indicate that, for the evolution of HO-adduct radicals, a mixed mechanism of both the carbocation intermediate pathway and O2-capturing pathway occurs in both aqueous TiO2 photocatalysis and aqueous Fenton reactions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTOCATALYSIS
*HABER-Weiss reaction
*DEUTERIUM
*AROMATIC compounds
*BENZOQUINONES
Subjects
Details
- Language :
- English
- ISSN :
- 18614728
- Volume :
- 11
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Chemistry - An Asian Journal
- Publication Type :
- Academic Journal
- Accession number :
- 120326154
- Full Text :
- https://doi.org/10.1002/asia.201601299