Desenvolvimento de uma plataforma para a detecção de composto fenólico

Abstract

Tert-butyl hydroquinone (TBHQ) is a phenolic antioxidant compound of synthetic origin widely used in the food and fuel industry. As it is a stable and low-volatile compound, TBHQ has a high efficiency in maintaining stability and delaying the oxidation of fuels and foods, but its excessive use is extremely harmful to health, making it necessary to control its use by people. competent bodies. In this sense, the present work aims to develop a photoelectrochemical platform for the detection of TBHQ using a fluorine-doped tin oxide (FTO) electrode modified with zinc oxide (ZnO) sensitized with copper selenide (Cu3Se2). The photoelectrochemical platform was named Cu3Se2/ZnO/FTO which showed an expressive variation in the photocurrent value against the TBHQ compound, when subjected to the presence of visible LED light, compared to the ZnO/FTO and Cu3Se2/FTO platforms. The characterization of the platforms was performed by electrochemical impedance spectroscopy (EIE), X-ray diffraction (XRD) and amperometry. Under the optimized experimental conditions, the proposed photosensor presented a linear response range from 0.4 to 290 µmol L-1 . The sensor was successfully applied for the determination of TBHQ in babassu methyl biodiesel and vegetable oil (soybean) samples showing recovery values for the analyte of 98.95% and 109.33%, respectively, suggesting good accuracy.