Estudo da remoÃÃo e degradaÃÃo dos corantes Remazol Black B e Remazol Red RB 133%, e do fÃrmaco Ganciclovir, com aplicaÃÃo de Processos Oxidativos AvanÃados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The contamination of rivers, seas, lakes and oceans is one of the major problems of modern society, caused in large part by industrial activities. Textile processing, particularly generate great amounts of effluent characterized by a high organic load, strong color and toxic chemical compounds, which, depending on the dye, can also contain mutagenic, carcinogenic and genotoxic substances. Another important source of contamination of water bodies are pharmaceuticals, considered one of the most refractory class of contaminants. Current treatments for these pollutants include advanced oxidative processes (AOP), which have been widely studied and may promote complete pollutant degradation. In this study, three types of AOP have been applied: Fenton (H2O2/Fe2+), photo-Fenton (H2O2/Fe2+/UV) and TiO2/UV processes. For the textile dye Remazol Black B, and the Ganciclovir antiviral drug, Fenton and photo-Fenton processes have been employed; and for the dye Remazol Red RB 133%, the photo-Fenton and TiO2/UV processes have been used. Full two-level factorial designs were used to search for the most advantageous experimental conditions. For the Remazol Black B, the efficiencies of the processes in the dye discoloration and reduction of total organic carbon are in the following order: photo-Fenton UVA light >photo-Fenton visible light >Fenton, confirming that UVA radiation is the most efficient for generating hydroxyl radicals. For Remazol Red RB 133%, with the photo-Fenton process, similar effects have been achieved for UVA and visible light lamps with respect to the dye discoloration; on the TiO2/UV process, a high dye removal was observed; besides, a complete molecule fragmentation, and no toxicity for samples with or without treatment. The Ganciclovir results indicated the possible formation of a complex between Fe2+ ion and Ganciclovir molecule, which depends on the presence of H2O2. The results also showed that the photo-Fenton reaction was more effective for the removal and degradation of the drug than the Fentonâs reaction

ASSUNTO(S)

planejamento fatorial uva and visible light quimica aop degradaÃÃo luz uva e visÃvel poa degradation factorial designs ganciclovir corantes tÃxteis ganciclovir textile dyes

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