Banca de QUALIFICAÇÃO: MAYARA FELICIANO GOMES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MAYARA FELICIANO GOMES
DATA : 02/12/2018
HORA: 16:00
LOCAL: SALA NUPEG
TÍTULO:

Study of the obtaining and characterization of chitin and chitosan from shrimp residues and their sustainable energy applications.

PALAVRAS-CHAVES:

chitin, chitosan, graphite, carbonization hydrothermal, photocatalyse, transesterification.

 

PÁGINAS: 110
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Currently one of humanity's biggest concerns today is the fate of industrial waste and the study of alternatives to sustainable energy. In this context, the aim of this work was to obtain chitosan from the discards of carniciculture, the biopolymer chitin and it is deacetylation by means of alkaline hydrolysis. The demineralization steps were performed through deproteinization to obtain chitin, and deacetylation to obtain chitosan, were characterized by X-ray diffraction (XRD), X-ray fluorescence (FRX), scanning electron microscopy (SEM), thermogravimetry (TG), UV visible and Fourier transformer spectroscopy (FTIR) for confirmation of  obtain  chitin and chitosan with an acetylation degree of DA of 70 and 75%, respectively.. The biopolymers, it was possible to perform the hydrothermal carbonization synthesis, which is a low cost process, of two renewable precursors, which are materials derived from biomass (chitin and chitosan) and graphite as a third material used to obtain two solid phase and liquid. The liquid phase would be for the formation of carbon quantum dots (CQDs) with application in solar cells and photocatalysis, and the solid phase for the formation of heterogeneous catalysts for reactions of transesterification of biodiesel. The phases were characterized according to the needs of their applications obtaining for the liquid phase a CQDs with quantum yield of 17.1% with doping in ZnO / CQDs with photocatalysis property. And for the solid phase a heterogeneous graphite-chitosan catalyst obtained process efficiency by gas chromatography with 36% conversion. Obtaining chitin and chitosan biopolymers is a great solution for the tons of waste produced in the shrimp industry. The realization of hydrothermal carbonization synthesis to obtain two products, the CQDs and graphite-chitosan catalysts demonstrate great alternatives for the use of sustainable energy in photocatalysis and transesterification reactions.

MEMBROS DA BANCA:
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Interno - 1308273 - EDUARDO LINS DE BARROS NETO
Externo à Instituição - INDIRA ARITANA FERNANDES DE MEDEIROS - UFRN