Banca de QUALIFICAÇÃO: KÁTIA MOREIRA DE MELO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : KÁTIA MOREIRA DE MELO
DATE: 29/08/2024
TIME: 14:30
LOCAL: Via google meet
TITLE:

PRODUCTION OF CELLULOSE NANOCRYSTALS FROM CORNCOB FOR IMMOBILIZATION OF LACCASES AIMING APPLICATION IN THE DECOLORATION OF EFFLUENTS FROM THE TEXTILE INDUSTRY

KEY WORDS:

Cellulose nanocrystals; Corn cob; Immobilized enzyme; Laccase; Discoloration of textile effluents.

PAGES: 57
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Bioquímicos
SUMMARY:

Aiming at the reuse of corn cobs, this work presents as an alternative for its use, the production of cellulose nanocrystals with the objective of applying this nanomaterial as a support for the laccase immobilization process. These multi-copper oxidase enzymes have the function of catalyzing the oxidation of phenolic and aromatic compounds present, for example, in effluents from the textile industry. In this work, immobilized laccases will discolor textile effluents from the dyeing sector of an industry in the region. Cellulose nanocrystals will be extracted from corn cobs through three hydrolysis routes (acid, enzymatic and sequenced) and characterized by Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Particles size analysis (PSA), Thermogravimetric analysis (TGA) and Life Cycle Assessment (LCA) for synthesis process of nanocrystals.  Before immobilization, to make a more stable bond between the laccase and the cellulose nanocrystals, covalent immobilization will be carried out, where epichlorohydrin and sodium periodate will be used in the process of activating the nanocrystals to form aldehydes, which will be linked to the amine group of laccase amino acids. Furthermore, the catalytic efficiency of the immobilized laccases will be evaluated after successive reuse cycles.

COMMITTEE MEMBERS:
Presidente - 3214434 - NATHALIA SARAIVA RIOS
Interno - 3304882 - CARLOS EDUARDO DE ARAÚJO PADILHA
Interno - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externa ao Programa - 1415657 - ANDREA OLIVEIRA NUNES - UFRN