Banca de QUALIFICAÇÃO: TAYNA PAULA BRITO DE AQUINO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: TAYNA PAULA BRITO DE AQUINO
DATA: 22/02/2016
HORA: 14:30
LOCAL: Auditório - Departamento de Química
TÍTULO:

NANOPARTÍCULAS DE Fe₃O₄@SiO₂ REVESTIDAS COM SnO₂ APLICADAS NA FOTODEGRADAÇÃO DO CORANTE AZUL DE REMAZOL

PALAVRAS-CHAVES:

nanoparticle; Fe₃O₄; SnO₂; photocatalysis; remazol blue dye

PÁGINAS: 22
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
RESUMO:

Fe₃O₄@SiO₂ NANOPARTICLES COATED WITH SnO₂ APPLIED IN THE PHOTODEGRADATION OF REMAZOL BLUE DYE

Fe₃O₄ nanoparticles were prepared by the method of co-precipitation and modifying these with SiO₂ by hydrolysis of TEOS. The SnO_xH_y was incorporated into the surface Fe₃O₄@SiOH by sol-gel method and used four concentrations of the precursor of tin solution to evaluate which of these provide saturation of the surface modified MNP. Thereafter, the materials were calcined at two different temperatures (300 ° C and 700 ° C) to examine the effect of calcining temperature in obtaining SnO₂ and material structure. The obtained nanoparticles were characterized by UV-Vis, FTIR, XRD and XRF. The spectra in the UV-Vis region showed characteristic scattering of the presence of nanoparticles and further evidence of the core-shell coating for materials Fe₃O₄@SiOH and Fe₃O₄@SiO₂@SnOxHy. The XRD patterns showed characteristic diffraction peaks of Fe₃O₄ according to JCPDS 01-088-0315 record. The FTIR spectra confirmed the presence of the three components in the synthesized material and XRF spectroscopy showed that the amount of Sn on the surface is higher with higher concentrations of the precursor solution. The photocatalytic efficiency of the nanoparticle it was evaluated on the photodegradation reaction of Remazol Blue dye to yield the amount of 85 % after 120 min of irradiation for the catalyst calcined at 700 °C.

MEMBROS DA BANCA:
Presidente - 1714171 - JANILDO LOPES MAGALHAES
Interno - 2363808 - EDMILSON MIRANDA DE MOURA
Interno - 1714193 - JOSE MILTON ELIAS DE MATOS
Externo ao Programa - 1570906 - BARTOLOMEU CRUZ VIANA NETO
Externo ao Programa - 1780191 - FRANCISCO ERONI PAZ DOS SANTOS