Investigação fotocatalítica das heteroestruturas BIVO4/CoFe2O4 no corante azul de metileno
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Data
2020-07-22
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Universidade Federal de Goiás
Resumo
Materials such as: BiVO4 and CoFe2O4 are of great importance because they have unique characteristics and properties. BiVO4 can be applied in catalysis, photoluminescence, partition, among others. CoFe2O4 is a magnetic material and a photocatalyst used in Fenton and Foto-Fenton reactions. In this work, BiVO4 and CoFe2O4 powders were synthesized in their pure form by coprecipitation with subsequent microwave-assisted hydrothermal treatment (CPTHAM), at 130 ° C for 30 min, with a heating rate of 10 ° C / min. Heterostructures composed of materials, BiVO4 and CoFe2O4 were displaced with proportions of 1 and 2 mol of BiVO4 to 1 mol of CoFe2O4 using CPTHAM. CoFe2O4 prey were anterior with spinel-type monophasic cubic phase and for BiVO4 they were eliminated as monoclinic and tetragonal phases. In the structural characterization by X-ray diffraction (XRD) of the heterostructures, all phases of interest were observed. The band gap values of the materials were determined by diffuse reflectance using UV-Vis spectroscopy. The values of the gap band were 2.41 for BiVO4 and 1.75 for CoFe2O4, respectively. The investigations of the photocatalytic and magnetic properties, observed a discoloration of the methylene blue dye of 60% and 58% in 120 min using a BiVO4 / CoFe2O4 heterostructure in the proportions of 1: 1 and 2: 1. It was noted that in the attraction heterostructures per magnet was efficient. In this way, the results obtained demonstrate that the heterostructures are effective in discoloration of the methylene blue dye and that they can be recovered after using a magnetic field.
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Vanadato de bismuto, Ferrita de cobalto, Heteroestruturas, Método hidrotérmico, Fotocatálise heterogênea, Bismuth vanadate, Cobalt ferrite, Heterostructure, Hydrothermal method, Heterogeneous photocatalysis
Citação
OLIVEIRA, L. G. Investigação fotocatalítica das heteroestruturas BIVO4/CoFe2O4 no corante azul de metileno. 2020. 60 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2020.