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Fotodegradação de hidrocarbonetos policíclicos aromáticos em placas de sílica impregnadas com dióxido de titânio Photodegradation of polycyclic aromatic hydrocarbons (PAHs) adsorbed onto silica gel chromatographic plates impregnated with TiO2
- Source :
- Química Nova, Vol 28, Iss 3, Pp 409-413 (2005)
- Publication Year :
- 2005
- Publisher :
- Sociedade Brasileira de Química, 2005.
-
Abstract
- Photodegradation of the PAHs anthracene, chrysene and benzo[k]fluoranthane on silica gel impregnated with TiO2 and over glass plates holding TiO2 was studied. Silica gel plates holding these substances were exposed to solar radiation, developed with hexane and photographed under ultra-violet light. The plates containing benzo[k]fluoranthene were also analysed by both diffuse reflectance and laser induced fluorescence. Diffuse reflectance spectra of the fluorescent spot from non irradiated plates showed small differences when compared with those obtained from irradiated plates. These spectral differences are compatible with formation of less conjugated compounds during irradiation. Fluorescence and time resolved fluorescence spectra observed after irradiation were identical to those obtained with benzo[k]fluoranthene in methanol. On plates holding silica, PAH degradation requires longer periods of solar irradiation when compared with those plates containing silica impregnated with TiO2. Glass plates impregnated with TiO2 also showed very rapid PAH degradation.
- Subjects :
- PAH
photodegradation
thin layer chromatography
Chemistry
QD1-999
Subjects
Details
- Language :
- English, Spanish; Castilian, Portuguese
- ISSN :
- 01004042 and 16787064
- Volume :
- 28
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Química Nova
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.3746326685247b59edc47d709fe323b
- Document Type :
- article
- Full Text :
- https://doi.org/10.1590/S0100-40422005000300009