Banca de QUALIFICAÇÃO: LARYSSA PLENTZ GOMES VASCONCELOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LARYSSA PLENTZ GOMES VASCONCELOS
DATE: 12/05/2023
TIME: 09:00
LOCAL: ON LINE
TITLE:

EVALUATION OF THE ADSORTIVE POTENTIAL OF IN NATURA BIOCARBON, CATALYTIC BIOCARBON AND ACTIVATED BIOCARBON, PRODUCED FROM THE PYROLYSIS OF LIGNOCELLULOSIC WASTE FROM SECOND-GENERATION ALCOHOL INDUSTRY

KEY WORDS:

2G alcohol. residual biomass. thermochemical process. emerging pollutants. adsorption

PAGES: 114
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Operações de Separação e Mistura
SUMMARY:

The lignocellulosic residue is obtained from the production of second-generation ethanol (2G). This material is rich in lignin and its main application is in the production of energy from its burning in boilers. In view of the above, this work proposes to carry out the in natura and catalytic pyrolysis of this residue, obtaining as one of the products the in natura biochar, catalytic and activated for application in the adsorption of methylene blue dye, atrazine herbicide and the hormone β- stradiol. For this purpose, the biomass was initially prepared so that it had a granulometry of 60 mesh and then the characterizations were carried out based on immediate analysis, thermogravimetric analysis (TGA) of the biomass in natura and impregnated with the K2CO3 catalyst. After producing the biochars, they were characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), pH at zero charge point (pHpcz), N2 adsorption/desorption isotherm by the BET method and Fourier transform infrared spectroscopy (FT-IR), noting that the biochars had an amorphous structure with crystalline parts, the pHpcz was 8.57 and 7.49 for in natura and catalytic biochar respectively. From the BET analysis, an increase in surface area and pore volume was observed for the catalytic biochar due to the unclogging of pores in the material. Then, the in natura and catalytic biochars obtained were used in the adsorption of the methylene blue dye. The kinetic study was carried out for concentrations of 20, 30 and 40 mg.L^-1 of dye in the time interval of 0-240 min. It was observed that the equilibrium time for in natura and catalytic biochar was 180 and 90 minutes, respectively, and both biochars showed better adaptation to the pseudo-second order model. From the study of the isotherms, which was carried out for temperatures of 30, 40 and 50 °C, it was observed that the adsorption process favored with the increase in temperature and the in natura and catalytic biochars presented a better fit to the Freundlich models and Langmuir respectively. Finally, the thermodynamic study was carried out from the equilibrium constant of the isotherm model that best suited each biochar and it was observed that the adsorption process for both biochars was considered spontaneous, viable and endothermic, occurring from physisorption. It was then concluded that the biochars produced were good adsorbents for the methylene blue pollutant adsorption process.

BANKING MEMBERS:
Interno(a) - 1545506 - ANTONIO OSIMAR SOUSA DA SILVA
Interno(a) - 1121112 - JOAO INACIO SOLETTI
Interno(a) - 496.472.704-10 - SANDRA HELENA VIEIRA DE CARVALHO - UFAL
Externo(a) à Instituição - CLAUDIO DARIVA
Externo(a) à Instituição - MOZART DALTRO BISPO - UFAL
Externo(a) à Instituição - POLLYANNA VANESSA DOS SANTOS LINS - UFAL