Remoção de fenol em amostras de água utilizando persulfato ativado por ferro zero suportado em biochar
Modernization, high population growth and accelerated production of inputs are triggering the increase in the generation of industrial effluents, which represents a serious problem globally, as they can contaminate water, soil and air. The oil industry is one of the main sources of water contamin...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/54707 |
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| Resumo: | Modernization, high population growth and accelerated production of inputs
are triggering the increase in the generation of industrial effluents, which represents a serious
problem globally, as they can contaminate water, soil and air. The oil industry is one of the
main sources of water contamination, and its products and by-products have numerous
contaminants with toxicological, carcinogenic and mutagenic properties, which can
compromise the quality of the environment and cause negative impacts on human, animal and
plant health. Phenol is a representative of the pollutants of this industry, being present in
effluents such as water produced from petroleum and in refineries. For the treatment of water
contaminated with this pollutant, Advanced Oxidative Processes (AOP) are being widely
used. Therefore, this work aimed to treat water contaminated with phenol through a POA
using sodium persulfate (PS) as an oxidant, and the combination of zero valence iron (ZVI)
supported on biochar (BC) as a form of of persulfate activation. The biochar was obtained by
pyrolysis (300°C for 1 h, with a heating rate of 10°C. min-1), using the peel of the fruits of
Calotropis procera as biomass, and the ZVI was obtained by the chemical reduction method.
BC, ZVI and BC-supported ZVI (BC/ZVI) were structurally, compositionally and
morphologically characterized by XRF, XRD, SEM-EDS, FTIR, zeta potential analysis,
particle size and polydispersion index. Regarding the oxidation experiments, an experimental
design was carried out in which the variables analyzed were the concentration of the oxidant
([PS] = 1 to 9 mM) and BC/ZVI ([BC/ZVI] = 1 to 5 g.L-1). Then, the process optimization
was performed, studying the concentration of the oxidant ([PS] = 5 to 13 mM), activator
([BC/ZVI] = 3 to 7 g.L-1) and pH (3.0 to 11.0). It was also possible to compare the activating
agent with the commercial Fe0, seeking to confront them with the proposed AOP. The results
obtained with the characterization of the materials confirm that the synthesized biochar was
similar to that synthesized by other works in the literature, being a carbonaceous material,
with pores in its structure and that presented several oxygenated groups on its surface. The
synthesized ZVI presented structures with irregular shapes and the particles tended to
agglomerate, similar behavior to that found in other literary studies. The BC/ZVI was
characterized as a material that had porosity, functional groups on its surface and that the ZVI
accommodated efficiently on its surface, allowing these particles to be available for oxidation.
The results of the oxidative treatment indicated that the proposed PS/BC/ZVI system is
efficient for phenol degradation, since good phenol removal results were obtained. From the
planning carried out, the best point obtained was test 4, with the optimal conditions of [PS] =
9 mM and [BC/ZVI] = 5 g.L-1 and pH = 3.0, having the rate of maximum removal of 89.99%
removal. The degradation of phenol using PS activated with BC/ZVI obtained in this work is
efficient for the treatment of effluents, in addition to its application to reduce toxicity in cases
of release into bodies of water without proper treatment. |
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