Desenvolvimento de sensor de cromo a partir de eletropolimerização de anilina

Abstract

Environmental issues have been increasingly discussed given the anthropogenic impacts generated by industrial effluents. The production of waste containing heavy metals directly affects aquatic and terrestrial environments, as well as living organisms. One of the metals that raises significant concern is chromium, which exists in two main oxidation states: trivalent - Chromium (III) and hexavalent – Chromium (VI). Chromium trivalent is more stable and is naturally found in the organism, integrating into metabolism without naturally causing complications for living organisms. However, its more oxidized state, Cr (VI), is problematic due to its carcinogenic characteristics. Therefore, hexavalent chromium is included in most national and international lists of highly toxic materials, subject to strict control procedures. In this study, the synthesis and application of a graphite sensor obtained from discarded batteries and modified with polyaniline (PANI) were investigated. PANI was electropolymerized from the aniline monomer using cyclic voltammetry. For the detection and quantification of hexavalent chromium, linear sweep voltammetry was employed. The sensor's construction achieved the detection of chromium, and the results obtained can serve as a basis for future studies to enhance its performance.