Síntese, caracterização e atividade fotocatalítica dos óxidos a base de CoFe2O4/Fe2O3 dispersos na KIT-6
Some poisonous compounds are resistant to degradation by common effluent treatments. For this reason, development of new methods and materials capable of solving this problem. Thus, the present work aimed to synthesize and characterize the solid CoFe2O4/Fe2O3-KIT-6, and to evaluate its performanc...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/48977 |
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| Resumo: | Some poisonous compounds are resistant to degradation by common effluent treatments. For
this reason, development of new methods and materials capable of solving this problem.
Thus, the present work aimed to synthesize and characterize the solid CoFe2O4/Fe2O3-KIT-6,
and to evaluate its performance in the photocatalytic degradation of Phenol and ultra RGB red
remazol dye.The material obtained was characterized by X-ray Diffraction (XRD), Mössbauer
Spectroscopy, X-ray Fluorescence (FRX), Infrared with adsorption of pyridine and NO
(FTIR), Raman spectroscopy, Thermogravimetric analysis (TGA), adsorption/desorption of
N2, Temperature Programmed Reduction (TPR-H2), Temperature Programmed Desorption
(TPD-CO2), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy
(TEM) and Diffuse Reflectance Spectroscopy (DRS). From the XRD, N2, Raman, TG and
Mössbauer fission analyses, it was possible to identify that the desired CoFe2O4/Fe2O3 phase
was obtained supported on KIT-6, which maintained its structural properties. The bands at
1450, 1490 and 1609 cm-1
in the FTIR-pyridine and the FTIR-NO profile indicate the
presence of Lewis acidic sites, while the TPD-CO2 profile showed a large amount of weak
basic sites. The TPR-H2 result shows a reduction profile with significant events around 450°C
and 850°C referring to the reduction of Fe and Co. The SEM and TEM images confirm that
the morphology of the support was not significantly altered after metal impregnation. The
band-gap energy of 1.7 eV indicates that the compound can be applied in photocatalytic
degradation under UV/visible light, with the possibility of magnetic separation at the end of
the reaction. The photocatalysis results indicate low degradation of phenol under the applied
conditions and complete degradation of the remazol red ultra RGB dye in 1 hour of reaction.
The combination of the proposed photocatalyst with the anatase phase (TiO2) shows
significant improvements in the degradation process even in the absence of H2O2. |
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