Sistemas eletroquímicos para tratar amostras de água contendo corante têxtil como ferramenta didática para divulgação da poluição hídrica

Abstract

Didactic workshops for scientific and technological dissemination, in addition to contributing to motivational aspects for the development of learning, are an interactive strategy that can provide the development of science learning. This research aims to use electrochemical systems to characterize the physicochemical properties of the coagulant lectin from Moringa oleifera seeds (cMoL) in the treatment of water samples containing indigo-type textile dyes as teaching tools for scientific dissemination about water pollution in effluents from the textile industry. The methodological development of this research comprises the development of aluminum piles using aluminum cans and PET bottles for the treatment of indigo-type dye solution; the determination of electrochemical potentials and cyclic voltammograms generated by the agglutination of cMoL immobilized on the MOF with an aqueous solution of indigo carmine dye; the development of potentiometric biosensors for the determination of indigo dye residues in aqueous media. Considerable differences were observed in the electrochemical potentials in relation to the platinum electrode (Pt), MOF coated platinum working electrode (Pt/MOF), MOF coated platinum electrode and immobilized cMoL (Pt/MOF/cMoL) and when interacting Pt /MOF/cMoL with different concentrations of galactose. Cyclic voltammetry showed results with significant differences between the untreated dye sample and the dye samples after treatment. The development of didactic workshops in school spaces to validate the electrochemical system as a didactic tool applied to learning and dissemination about water pollution caused by the disposal of indigo dyes in textile industry effluents is relevant for the construction of concepts related to electrochemistry.