Remoção de contaminantes da indústria do petróleo por adsorção com paligorsquita: uma avaliação cinética e termodinâmica
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 spec...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/28282 |
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| 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 (Ϛ) 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
.g1
) 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. |
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