Aplicação da tecnologia eletroquímica na mineralização e detecção de compostos orgânicos em efluentes sintéticos
The application of electrochemical technologies in remediation of wastewater has been extensively studied due to the promising results achieved. These technologies are mainly based on the generation of species with high oxidation power, which in turn are responsible for the degradation and mineraliz...
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| Formato: | doctoralThesis |
| Lenguaje: | pt_BR |
| Publicado: |
Universidade Federal do Rio Grande do Norte
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| Materias: | |
| Acceso en línea: | https://repositorio.ufrn.br/handle/123456789/46636 |
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| Sumario: | The application of electrochemical technologies in remediation of wastewater has
been extensively studied due to the promising results achieved. These technologies are
mainly based on the generation of species with high oxidation power, which in turn are
responsible for the degradation and mineralization of organic compounds. In this work,
the application of some of these methodologies in the treatment of synthetic contaminated
water was studied, in addition to the use of electroanalytical technologies in the detection
and quantification of these compounds. The results achieved are presented in two distinct
chapters. In the first chapter, peroxycoagulation (PC) was used to treat a synthetic effluent
of methyl orange (MO), an azo dye, studying the effects of different parameters including
initial pH, current density (j), initial concentration of dye and electrolyte support. In
addition, PC performance has been compared to other advanced electrochemical
processes, under similar experimental conditions. The results indicate that the kinetic
decay of the MO increases in the following order: electrocoagulation (EC) <
electrochemical oxidation (EO) with electrogenerated H2O2 < PC < electro-Fenton (EF).
This behavior is attributed to the highly oxidizing character of the homogeneous ●OH
radicals generated by the EF and PC processes. Energy consumption was about 0.06 kWh
gCOD-1
, 0.09 kWh gCOD-1
, 0.7 kWh gCOD-1
and 0.1 kWh gCOD-1
for PC, EF, EO-H2O2
and EC, respectively. PC thus appears as a promising and competitive alternative for the
decontamination of wastewater. In the second chapter, the detection and quantification of
p-benzoquinone (BQ) was performed using the differential pulse voltammetry (DPV)
technique with a diamond film sensor, in addition to BQ degradation by anodic oxidation.
A series of electrochemical galvanostatic oxidation experiments with 130 mL of BQ
solution was carried out in order to understand the effect of current density, pollutant
concentration and initial pH using different electrolytes with similar conductivity. The
ideal operating conditions were achieved in 33.3 mA cm-2, 100 mg L-1 of BQ at pH 5.0
with 50 mM Na2SO4. In addition, the evolution of short-chain carboxylic acids in this test
was followed over time to suggest a possible degradation route. Demonstrating the
efficiency of electrochemical technology in the degradation and evaluation of treatment. |
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