Degradação fotocatalítica de rodamina b utilizando ferritas de cobre e níquel sintetizadas pelo método de complexação combinado edta-citrato
World pollution has increased due to increasing global industrialization. The aquatic environment is one of the most affected, with many different types of pollutants being found, which cause variation in the original characteristics of water bodies. Dyes make up a class of these pollutants, whic...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/52298 |
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| Resumo: | World pollution has increased due to increasing global industrialization. The aquatic
environment is one of the most affected, with many different types of pollutants being found,
which cause variation in the original characteristics of water bodies. Dyes make up a class of
these pollutants, which have an organic nature and resistance to conventional treatments,
requiring the application of more effective processes such as Advanced Oxidative Processes
(AOP's), for the treatment of contaminated environments. AOP's cover a wide range of
processes, including methods that use semiconductor catalysts to promote the generation of
hydroxyl radicals (HO•), such as heterogeneous photocatalysis. The nature of these materials is
diverse, and spinel ferrites have these semiconductor properties, with the general formula,
MFe2O4, they are magnetic, chemically and mechanically stable, where M represent cations of
divalent metals, which can be composed of a mixture of these cations, the in order to better
adjust the properties of the materials. In this work, the study of the use of mixed ferrites of
copper and nickel (NixCu(1-x)Fe2O4) in different proportions (x = 0; 0.2; 0.8 and 1) was carried
out to photocatalytically degrade the dye Rhodamine B, simulating an industrial effluent. The
mixed copper and nickel ferrites were synthesized by the combined EDTA-Citrate
complexation method, and characterized by the techniques of XRD, Ritveld Refinement, SEMFEG, EDS, TG, FT-IR and ERD UV-Vis. Preliminary tests were proposed to evaluate the
degradation of the Rhodamine B dye, namely: self-degradation, photolysis and photocatalysis,
with the photocatalytic degradations presenting better results. Finally, the effect of reaction
parameters: catalyst load and pH on degradation was studied to establish the best reaction
conditions, which were achieved for a catalyst load of 0.62 g/L, pH = 10 and dye concentration
of 10 ppm. The samples containing the highest copper content (CuFe2O4 and Ni0.2Cu0.8Fe2O4)
obtained the best degradation results with approximately 60% removal of the Rhodamine B dye. |
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