Conciliação entre modelos de mecanismos avançados de oxidação eletroquímica
Many pollutants dumped in waterways, such as dyes and pesticides, have become so ubiquitous that they represent a serious threat to human health. The electrochemical oxidation is presented as an alternative clean, efficient and economic degradation of wastewater containing organic compounds and a nu...
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| Formato: | Dissertação |
| Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/17674 |
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| Resumo: | Many pollutants dumped in waterways, such as dyes and pesticides, have become so
ubiquitous that they represent a serious threat to human health. The electrochemical oxidation
is presented as an alternative clean, efficient and economic degradation of wastewater
containing organic compounds and a number of advantages of this technique is to just not
make use of chemical reagents, since only electrical energy is consumed during the removal of
pollutants organic. However, despite being a promising alternative, still needs some tweaking
in order to obtain better efficiency in the elimination of persistent pollutants. Thus, this study
sought a relationship between a recently discovered phenomenon that reflects the participation
of dissolved oxygen in solution in the electrochemical oxidation process, as an anomaly,
present a kinetic model that shows instantaneous current efficiency (ICE) above 100% limited
by theory, manifested for some experiments with phenolic compounds with H2SO4 or HClO4 as
supporting electrolyte with electrodes under anodic oxidation on boron doped diamond
(BDD). Therefore it was necessary to reproduce the data ICE exposes the fault model, and
thus the 2-naphthol was used as phenolic compound to be oxidised at concentrations of 9, 12
and 15 mmol L-1, and H2SO4 and HClO4 to 1 mol L-1 as a supporting electrolyte under a current
density of 30 mA cm-2 in an electrochemical reactor for continuous flow disk configuration,
and equipped with anodes DDB at room temperature (25 oC). Experiments were performed
using N2 like as purge gas for eliminate oxygen dissolved in solution so that its influence in the
system was studied. After exposure of the anomaly of the ICE model and investigation of its
relationship with dissolved O2, the data could be treated, making it possible for confirmation.
But not only that, the data obtained from eletranálise and spectroscopic analysis suggest the
involvement of other strongly oxidizing species (O3 (ozone) and O radicals and O2
-), since the
dissolved O2 can be consumed during the formation of new strong oxidizing species, not
considered until now, something that needs to be investigated by more accurate methods that
we may know a little more of this system. Currently the performance of the electrocatalytic
process is established by a complex interaction between different parameters that can be
optimized, so it is necessary to the implementation of theoretical models, which are the
conceptual lens with which researchers see |
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