Banca de QUALIFICAÇÃO: JOHNATAN DE OLIVEIRA SOARES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOHNATAN DE OLIVEIRA SOARES
DATE: 04/02/2022
TIME: 14:00
LOCAL: Vídeoconferência
TITLE:

SYNTHESIS AND CHARACTERIZATION OF CoFe2O4/Fe2O3 SCATTERED IN KIT-6:

APPLICATION IN PHOTOCATALYTIC DEGRADATION OF PHENOL

KEY WORDS:

Keywords: CoFe2O4, Fe2O3, Ferrite, KIT-6, Photocatalysis.

PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

This work aimed to synthesize and characterize the solid CoFe₂O₄/Fe₂O₃-KIT-6, and to evaluate its performance in the photocatalytic degradation of Phenol. 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. Initial photocatalysis results indicate low phenol degradation under the applied conditions.

BANKING MEMBERS:
Interno - 350509 - ANTONIO SOUZA DE ARAUJO
Externo à Instituição - LECH WALESA OLIVEIRA SOARES - IFPB
Interna - 2413537 - POLLYANA SOUZA CASTRO
Presidente - 2087667 - TIAGO PINHEIRO BRAGA