Avaliação do tratamento eletroquímico (direto e indireto) como alternativa de degradação do corante azul de metileno
Textile industry has been a cause of environmental pollution, mainly due to the generation of large volumes of waste containing high organic loading and intense color. In this context, this study evaluated the electrochemical degradation of synthetic effluents from textile industry containing Met...
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| Natura: | doctoralThesis |
| Lingua: | por |
| Pubblicazione: |
Universidade Federal do Rio Grande do Norte
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| Accesso online: | https://repositorio.ufrn.br/jspui/handle/123456789/20224 |
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| Riassunto: | Textile industry has been a cause of environmental pollution, mainly due to the generation of
large volumes of waste containing high organic loading and intense color. In this context, this
study evaluated the electrochemical degradation of synthetic effluents from textile industry
containing Methylene Blue (AM) dye, using Ti/IrO2-Ta2O5 and Ti/Pt anodes, by direct and
indirect (active chlorine) electrooxidation. We evaluated the influence of applied current
density (20, 40 and 60 mA/cm2
), and the presence of different concentrations of electrolyte
(NaCl and Na2SO4), as well as the neutral and alkaline pH media. The electrochemical
treatment was conducted in a continuous flow reactor, in which the electrolysis time of the
AM 100 ppm was 6 hours. The performance of electrochemical process was evaluated by
UV-vis spectrophotometry, chemical oxygen demand (COD) and total organic carbon (TOC).
The results showed that with increasing current density, it was possible to obtain 100 % of
color removal at Ti/IrO2-Ta2O5 and Ti/Pt electrodes. Regarding the color removal efficiency,
increasing the concentration of electrolyte promotes a higher percentage of removal using
0,02 M Na2SO4 and 0,017 M NaCl. Concerning to the aqueous medium, the best color
removal results were obtained in alkaline medium using Ti/Pt. In terms of organic matter, 86
% was achieved in neutral pH medium for Ti/Pt; while a 30 % in an alkaline medium. To
understand the electrochemical behavior due to the oxygen evolution reaction, polarization
curves were registered, determining that the presence of NaCl in the solution favored the
production of active chlorine species. The best results in energy consumption and cost were
obtained by applying lower current density (20 mA/cm2
) in 6 hours of electrolysis. |
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