Banca de DEFESA: ANNE BEATRIZ FIGUEIRA CÂMARA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANNE BEATRIZ FIGUEIRA CÂMARA
DATA : 08/07/2019
HORA: 08:00
LOCAL: Auditório do CCET/UFRN
TÍTULO:

Removal of contaminants from the petroleum industry by adsorption with paligorsquita - a kinetic and thermodynamic evaluation

PALAVRAS-CHAVES:

Palygorskite clay mineral; Adsorptive desulfurization; Dyes adsorption; metals adsorption; Adsorption thermodynamics; Adsorption kinetic.

PÁGINAS: 120
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Palygorskite (Pal) is a low-cost clay mineral material and was investigated in this study as a novel adsorbent to study the contaminants removal process from the petroleum industry by the adsorption process. This clay mineral was characterized by  X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal analysis (TG/DTG/DSC), zeta potential () and N₂ adsorption/desorption isotherm analyses by BET and BJH methods. Palygorskite textural properties (specific surface area 156 m².g^-1, total pore volume 0.36 cm³.g^-1) and specific surface chemistry activity with several metals, as Fe²⁺, Mg²⁺ and Al³⁺ according to XRF analysis, were crucial to efficient contaminants adsorption. This material was used in raw and modified forms to evaluate the adsorption capacity. Several kinetic, as pseudo-first order, pseudo-second order, Elovich, intraparticle diffusion and Boyd diffusion; equilibrium as Langmuir, Freundlich, Temkin and Dubinin-Radushkevish isotherms; and thermodynamics (ΔH°, ΔGº e ΔS°)  models were used to assess the experimental data. The results showed high correlation to the pseudo-second order kinetic model for the adsorbates (R² > 0.99), suggesting a chemisorption process as the determining step. Isotherm data were used to evaluate the equilibrium experimental data, which permits to obtain maximum adsorption capacity calculated from the Langmuir isotherm (R² > 0.97), where it can be observed that Pal presents an improved in the dye removal capacity (14.285 mg.g^-1). The Pal adsorbent showed good adsorption potential, standing out for being an abundant clay mineral in nature, environmentally safe, and with high possibility of its applications in adsorption and catalysis processes.

MEMBROS DA BANCA:
Presidente - 348475 - DJALMA RIBEIRO DA SILVA
Externa ao Programa - 1805556 - LUCIENE DA SILVA SANTOS
Externo à Instituição - LUIZ CARLOS BERTOLINO - CETEM
Externo ao Programa - 1958858 - LUIZ HENRIQUE DA SILVA GASPAROTTO
Externa ao Programa - 1523912 - TATIANA DE CAMPOS BICUDO