Produção Nacional
Revisado por pares
Fotodegradação de hidrocarbonetos policíclicos aromáticos em placas de sílica impregnadas com dióxido de titânio
2005; Brazilian Chemical Society; Volume: 28; Issue: 3 Linguagem: Inglês
10.1590/s0100-40422005000300009
ISSN1678-7064
AutoresLaura Furquim Werneck Xavier, Isabel Moreira, M. M. Higarashi, Josino Costa Moreira, Luiz Filipe V. Ferreira, Anabela S. Oliveira,
Tópico(s)Water Quality Monitoring and Analysis
ResumoPHOTODEGRADATION OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) ADSORBED ONTO SILICA GEL CHROMATOGRAPHIC PLATES IMPREGNATED WITH TiO 2 .Photodegradation of the PAHs anthracene, chrysene and benzo[k]fluoranthane on silica gel impregnated with TiO 2 and over glass plates holding TiO 2 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 TiO 2 .Glass plates impregnated with TiO 2 also showed very rapid PAH degradation.
Referência(s)