Navegando por Palavras-chave "Endocrine Disrupters"

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    Estudo da degradação do Bisfenol A em solução aquosa por processo foto-fenton irradiado artificialmente e baixo custo energético
    (Universidade Federal de São Paulo (UNIFESP), 2020-02-14) Fantinati, Leticia [UNIFESP]; Ribeiro, Katia [UNIFESP]; Universidade Federal de São Paulo
    Bisphenol A is a synthetic material used in the production of plastics and resins. And it is considered a chemical endocrine disruptor, known to be an emerging pollutant in several environmental compartments and can cause significant adverse effects on living beings such as cancer, diabetes and autism, among others. Human exposure to bisphenol A occurs mainly because it is commonly used as a raw material in a variety of industrial processes, such as the production of polycarbonate plastic containers and food cans coated with epoxy resins. In Brazil, the legislation does not regulate the maximum allowed concentration of bisphenol A in effluents or bodies of water. Effluent treatment stations equipped with traditional technologies such as activated sludge process, do not satisfactorily reduce chemical endocrine disrupters in effluents. Advanced oxidative processes have been used in the degradation of several emerging pollutants, such as bisphenol A. According to the literature, the rate of degradation increases with the number and potency of lamps, increasing the energy cost of treatment. In the present study, the conditions for degradation of 25 and 50 mg L-1 of bisphenol A were studied in aqueous medium (total volume = 1500 mL), applying the advanced oxidative processes, specifically fenton and photo-Fenton process, using low rated power lamps (6 W). The results showed rapid bisphenol A removal, which was analyzed by high-efficiency liquid chromatography using C18 kinetex reverse column, and mobile acetonitrile/water phase (30/70; v/v). In order to study the effect of Fe 2+ and H2O2 concentrations on bisphenol A degradation, a statistical analysis was performed using the technique of factorial experimental planning. With the results obtained, it was possible to evidence the importance of Fe2+ concentration at the beginning of the reaction. Total Organic Carbon analyses were performed and showed that for degradation of 60 % of total organic carbon, in 60 minutes of reaction, the photo-Fenton process is more efficient, when H2O2 concentrations equivalent to twice the stochiometric value with Fe2+ 10 mg L-1 and irradiation with two UV/Visible OSRAM 6 W lamps were used.