Estudo da degradação de hidrocarbonetos policíclicos aromáticos a partir da reação de fenton utilizando magnetitas dopadas com cobalto
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Data
2009-03-06
Autores
Biazati, Luciana Brunhara
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Universidade Federal do Espírito Santo
Resumo
The awareness regarding Polycyclics Aromatic Hydrocarbons (PAHs), petroleum derivatives, has been increasing over the years due to their toxic, carcinogenic and mutagenic characteristics. The increase on the use of petroleum and its derivatives as energy source has induced many accidents spilling liquid effluent in the environment, making harm to biota, including human beings. So that, developing efficient procedures is important on the partial or total elimination of these compounds. A common technique that has been used recently is the Fenton process. This is based on the generation of hydroxyl radical from the reaction of Fe2+ions and hydrogen peroxyde, forming CO2, H2O and inorganic ions from heteroatoms. This study evaluated PAHs (acenaphthene, fluorene, fluoranthene, benzo(a)pyrene) decomposition due to the fenton process in water by utilization of pure and doped magnetites (with Co as source of ions Fe2+) and hydrogen peroxyde. In order to compare the two kinds of magnetites, fluorene was degraded utilizing fluorescence to evaluate its concentration. We observed that reaction was not significant when pure magnetite was used, whereas doped one degraded fluorene completely after five hours. Because of this, only doped magnetite was used with the other compounds, but evaluating its efficience and intermadiaries formation by gas chromatography and mass spectrometry (GC/MS). The degradation of HPAs varied from 39 to 100%. Acenaphtene (with three rings) reacted more intensively whereas benzo(a)pyrene (with five) reacted less. No intermediate compounds were found above the detection limit. Beside GC-MS, fluorescence was utilized to analyse the compounds. Our goal was to compare the pure magnetite efficiency to that of doped one regarding fluorene degradation. We observed that the degradation using the former was not significant. Magnitite doped with cobalt degraded it within five hours. So, the method may be a new alternative of treating liquid efluents
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Polycyclic aromatic hydrocarbons - HPA , Magnetite , Fenton , Hidrocarbonetos policíclicos aromáticos - HPA , Magnetita , Fenton
Citação
BIAZATI, Luciana Brunhara. Estudo da degradação de hidrocarbonetos policíclicos aromáticos a partir da reação de fenton utilizando magnetitas dopadas com cobalto. 2009. Dissertação (Mestrado em Mestrado em Química) - Universidade Federal do Espírito Santo, Vitória, 2009.