Investigação do processo oxidativo avançado (UVC/ H2O2/Carvão ativado) na eliminação de Ftalatos
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2017-05-05
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Universidade Federal de Goiás
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The objective of this work was to compare the efficiency of conventional treatments such as
activated carbon (AC) Adsorption and the advanced oxidation process (AOP), UV-C/H2O2, for
degradation of diethyl phthalete (DEP) and coupling UV-C/H2O2/AC in laboratory effluent,
ultrapure water and faucet water doped with DEP and laboratory effluent with multicomponents
(DEP and phenol). The chemical characterization (Boehm method, pHPZC, IRTF,
elemental analysis) and physical (volume of micropores and mesopores, mean micropore
width by the Dubini-Radushkevich method were used as a predecessor to the kinetic
adsorption study, Surface area and microporous specific volume by the alpha method,
microporous and total surface, BET surface area by BET method, cumulative mesopore
distribution and pore volume, cumulative area and surface area and pore size by BJH method)
of AC. The factorial design with eleven tests and three independent variables (AC mass,
temperature and pH) was applied, resulting in response surfaces for adsorption capacity, DEP
elimination rate and equilibrium time without significant difference between the studied
variables. Mathematical modeling of adsorption kinetics using the pseudo-first, pseudo-second
order and intraparticle models was performed and the pseudo-second order model was fitted
to the experimental kinetic adsorption data. It was followed by the study of the adsorption
isotherms for the lower, intermediate and longer equilibrium experimental conditions. It was
performed the mathematical modeling of the adsorption isotherms using the Langmuir and
Freundlinch models, and adjusted to the Freundlinch model to the experimental data of the
adsorption isotherms with higher determination coefficients (R2), confirming the predominant
chemorandomization adsorption phenomenon. The treatment of AOP UV-C/H2O2 was then
applied alone. The factorial design with eleven tests and three independent variables (H2O2
concentration, temperature and pH) was applied, resulting in surfaces of responses to DEP
elimination rate with significant difference between the variables studied for pH, positive effect
of H2O2 concentration (p < 0.5). The mathematical modeling of the kinetics of AOP using the
first order models was carried out, and the kinetic experimental data of the photodegradation
with high coefficients of determination (R2> 0.9) were fitted to the model. The degradation
kinetics of DEP by AOP coupling and AC, UV-C/H2O2/AC were followed. The factorial design
with eleven tests and three independent variables (H2O2 concentration, temperature and pH)
and with 0.4 g of AC, resulting in surfaces of responses to elimination rate of DEP with
significant difference between the variables studied for pH, positive effect of H2O2 concentration (p <0.5). The mass of AC was determined in 0.4 g for all eleven tests, because
it was the mass applied at the highest rates of elimination of DEP by kinetics of Adsorption,
which was confirmed by repeatability at the central points of the factorial design (C9, C10 and
C11). The catalytic activity of the carbons for the Adsorption process in the presence of tertbutanol
was high, however, after the determination of the kinetic parameters, the contribution
was higher for photooxidation of DEP by the action of the AOP (homogeneous system).
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ALMEIDA, Maria Carolina de. Investigação do processo oxidativo avançado (UVC/ H2O2/Carvão ativado) na eliminação de Ftalatos. 2017. 187 f. Dissertação (Mestrado em Ciência e Tecnologia de Alimentos) - Universidade Federal de Goiás, Goiânia, 2017.