Navegando por Autor "Ferreira, T. L. B."
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Artigo Effects of MnO2/In2O3 thin films on photocatalytic degradation 17 alpha-ethynylestradiol and methylene blue in water(Springer, 2018-05-23) Ferreira, T. L. B.; Garcia, Laurênia Martins Pereira; Gurgel, G. H. M.; Nascimento, Rubens Maribondo do; Godinho Junior, Mario; Rodrigues, Murillo Henrique de Matos; Delmonte, Maurício Roberto Bomio; Motta, Fabiana Villela daIn recent years, there has been a growing concern about some substances in the aquatic environment such as methylene blue dye (MB) and 17α-ethynylestradiol (EE2) hormone, mainly from waste textile and pharmaceutical industries, respectively. This waste, which is not effectively treated, generates large amounts of contaminated effluents. Textile industries, which use dyes mainly in their dyeing and finishing processes, generate a lot of effluent contamination by dyes. The 17α-ethynylestradiol hormone which is used in different contraceptive pills and in hormone replacement therapy, is the main substance found in the aquatic environment because of its high resistance to biodegradation. It is known that conventional water treatment processes, which involve the steps of coagulation, flocculation and sedimentation among others, have been reported to be ineffective in the removal of dyes and hormones. The heterogeneous photocatalysis has attracted great interest from many research groups around the world due to its potential application as a pollutant degradation method. For this purpose, the present work evaluated the performance of MnO2/In2O3 thin films in the degradation process of the blue methylene and 17α-ethynylestradiol in aqueous solutions. The degradation processes were monitored by UV–Vis spectroscopy and HPLC chromatography. From these analyzes, the concentration of the solutions was evaluated and it was possible to infer that the MnO2/ In2O3 thin films significantly promoted a degradation of 89% of 17α-ethynylestradiol, however, the degradation of the methylene blue was not efficientArtigo Removal study of the hormone17 alpha‐ethynylestradiol and methylene blue dye from water using TiO2, Mn2O3 and TiO2/Mn2O3 thin flms(Springer, 2020-05-08) Paskocimas, Carlos Alberto; Rezende, T. T. A.; Garcia, L. M. P.; Ferreira, T. L. B.; Godinho, M. J.; Nascimento, Rubens Maribondo do; Delmonte, Maurício Roberto Bomio; Motta, Fabiana Villela daThe disposal of pollutants in the surface, underground, and public water supply is an important problem, which is why it is necessary to study more efcient photocatalysts in the treatment of wastewater. In this context, thin flms of TiO2, Mn2O3 and TiO2/Mn2O3 were prepared by the hydrolysis of precursors in the presence of citric acid and ethylene glycol, to evaluate the photocatalytic performance in the degradation of methylene blue dye and the hormone 17a-ethinylestradiol (EE2), the measurements were repeated 10 times in a period of 300 min. Thin flms were deposited by spin-coating on Si (100) substrates and calcined at 500 °C and 600 °C for 2 h. Nanocomposites were characterized by X-ray difraction, atomic force microscopy, scanning electron microscopy, UV–visible spectroscopy, photocatalytic activity, and photoluminescence. X-ray difraction results revealed that no other phase was formed besides anatase and bixbite, indicating that there was no chemical interaction between the TiO2 and Mn2O3 layers. The results show the degradation values of methylene blue in approximately 57% and for the 17a-ethinylestradiol a degradation around 82%, showing that the studied photocatalysts are promising, mainly for the degradation of 17a-ethinylestradiol