Influência do material anódico na formação de íons persulfato e mineralização do corante negro de eriocromo T

Abstract

A textile industry produces large amounts of effluents during washing without dyeing process, consequently a large amount of dye is part of its constitution.These textile wastes, in turn, have a high potential for toxicity and carcinogenicity for human and environmental health, causing interference in water bodies of the kind that makes it impossible to insert sunlight into the environment itself.Given this scenario, different technologies have been investigated for the removal of dyes in effluents, among which the electrochemical methods have the advantage of in situ production of strongly oxidizing species, such as hydroxyl radicals (● OH), active chlorine species and persulfate ions (S2O82-).Thus, the present work aimed to investigate the application of Electrochemical Oxidation using Boron Doped Diamond (DDB) and Titanium-supported Platinum (Pt / Ti) anodic electrodes for the removal of Eriochrome T black and in situ formation. persulfate ions (S2O82-) under the application of electric current densities of 30 and 60 mA / cm² in the presence of sodium sulfate (Na2SO4). According to the results obtained in the experiments, the use of anodic electrodes assisted in the removal of the dye, however only the experiment in which the DDB was used under the electric current density of 60 mAcm-2 was able to achieve the complete degradation of the contaminant. This is due to the fact that DDB is a non-active electrode, thus having a higher electrogeneration of oxidizing agents (●OH e S2O82-) on the anodic surface, resulting in a favoring of the complete mineralization process of organic matter.