Photocatalytic degradation of some toxic analytical reagents with TiO2
Photodegradation processes of two azo dyes at TiO2/H2O interface under visible and ultraviolet light irradiation are investigated with different experimental techniques (absorption and fluorescence spectroscopy as well as total organic carbon analysis). Measuring their fluorescence spectra monitored...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
1999-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X99000161 |
| Summary: | Photodegradation processes of two azo dyes at TiO2/H2O interface under visible and ultraviolet
light irradiation are investigated with different experimental techniques (absorption and fluorescence
spectroscopy as well as total organic carbon analysis). Measuring their fluorescence spectra monitored the
generation of some degradation intermediates. The photodegradation rate depends on dye structure and
pH of the dispersion. The rate was found to be enhanced by increasing dissolved oxygen concentrations in
the medium. The mechanism of the photodegradation process under uv-visible light illumination involves
an electron excitation into the conduction band of the TiO2 semiconductor leading to the generation of very
active oxygenated species that attack the dye molecules leading to photodegradation. |
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| ISSN: | 1110-662X |