Processos oxidativos avançados (POA) no ensino de Cinética Química: proposta de ferramenta metodológica envolvendo a Química e a Educação Ambiental

Abstract

Environmental education is a branch of science instituted by the law 9795, on April 27, 1999, which must be applied as transversal content. It is not defined as a discipline, but it needs to take part in all disciplines, being applied as interdisciplinary content. AOP (Advanced Oxidation Process) experiments with dyes prove to be a very interesting tool to explain contents of chemical kinetics, especially what is related to the role of catalysts, interacting with environmental education. In this sense, this work aims to propose experiments that use AOP for teaching chemical kinetics, seeking interdisciplinary between chemistry and environmental education. For then, a type of AOP, known as photo-Fenton process, was performed to remove the color of, solutions of fabric, food and hair dyes. Through images, the changes of the solutions were analyzed according to the reaction time, and it was possible to observe that the photo-Fenton process accelerated the oxidation of the dye of the solutions, initiating the reaction in a timely manner for use in a expositive class, having been verified a great change, in the solutions of the three dyes, in a time of 2 hours, with beginning of changes being seen in a time of 1 hour. After 7 hours, the complete removal of the colors was observed in the solutions studied, a result confirmed by UV-Visible spectroscopy. It was also possible to carry out the experiment with alternative materials, which showed the same result as that carried out with laboratory tools.