Estudo da influência de diferentes grupos funcionais em corantes têxteis na aplicação de processos eletroquímicos oxidativos avançados (PEOAs) para descoloração e remediação dos seus efluentes
The water quality as well as its pollution, has caused great concern in the scientific community. The textile industry has been one of causing environmental pollution, mainly due to the generation of a large amount of waste due to the high organic load and intense color of their production. Within t...
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| 格式: | Dissertação |
| 语言: | por |
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| 在线阅读: | https://repositorio.ufrn.br/jspui/handle/123456789/23387 |
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| 总结: | The water quality as well as its pollution, has caused great concern in the scientific community. The textile industry has been one of causing environmental pollution, mainly due to the generation of a large amount of waste due to the high organic load and intense color of their production. Within this context, electrochemical water treatment technologies are highly promising to achieve complete decolorization of dyebath effluents, as demonstrated by several studies reported in the literature. Therefore, in the present study, we compared different Processes Electrochemical Advanced Oxidation (EOAPs) and their potential in discoloration of contaminated textile effluents, as well as discoloration to the influence of different functional groups which modify the dyestuff structure (Reactive Orange 16, Reactive Violet 4, Reactive Red 228 and Reactive Black 5). The results demonstrate that the functional groups that reduce the nucleophilicity of the pollutant hinder the electrophilic attack of electrogenerated hydroxyl radical. Thereby, the overall decolorization efficiency is consequently reduced as well as the decolorization rate. Moreover, the presence of an additional chromophore azo bond in the molecule enhances the recalcitrant character of the azo dyes as pollutants due to the formation of a larger and more stable conjugated π system, becoming greater the activation energy required for the electrophyilic attack of •OH and also affecting the performance of electrochemical technologies on effluents decolorization. |
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