Banca de QUALIFICAÇÃO: OLÍMPIO JOSÉ DA SILVA JÚNIOR

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : OLÍMPIO JOSÉ DA SILVA JÚNIOR
DATA : 06/07/2018
HORA: 09:00
LOCAL: videoteca da BCZM
TÍTULO:

Metal-Organic frameworks and oxides derived from the preparation of an application in the adsorption of organic dyes

PALAVRAS-CHAVES:

Metal-Organic Frameworks; Ca-MOF; CuMOF; CuO; Methylene blue; Adsorption; Degradation; discoloration

PÁGINAS: 110
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Compostos Organo-Metálicos
RESUMO:

Metal-Organic Frameworks (MOF's) are a new class of porous structure materials in which atoms or metal clusters are coordinated by polydentate organic binders. They usually have high surface area and a large volume of pores, which makes them interesting alternatives for applications in catalysis, adsorption, separation, gas storage, among others. Calcium-based and 1,4-H₂BDC acid networks were synthesized via a sonochemical method, whereas Cu-MOF's were prepared by electrochemical method from three different ligands, 1,3-H₂BDC, 1,4-H₂BDC and 5- NH₂-H₂BDC. The Cu-MOFs were calcined at a temperature of 923 K to obtain the mesoporous CuO. All the prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Ca-MOFs were tested in adsorption kinetics of the methylene blue adsorption, adsorption kinetics of the pseudo-first and pseudo-second order models, adsorption mechanism by the Freundlich and Langmuir models, study thermodynamic and reuse of the material. On the other hand, the mesoporous CuO was tested in the catalytic degradation of the methylene blue in the presence of H₂O₂. The Ca-MOFs presented maximum adsorption capacity of 58,520 μmol.g-1, a value compatible with other MOFs already reported in the literature. The most important result, however, was the high efficiency in the reuse, where 97% of the initial adsorption capacity was reached in the second cycle. Already in the degradation of the dye using mesoporous CuO as catalyst, a level of about 94% of discoloration was reached.

MEMBROS DA BANCA:
Interno - 1959889 - DAVI SERRADELLA VIEIRA
Externo ao Programa - 338292 - JOAO BOSCO LUCENA DE OLIVEIRA
Externo à Instituição - ELANIA MARIA FERNANDES SILVA - UFRN
Externo à Instituição - JARLEY FAGNER SILVA DO NASCIMENTO - IFRN