Abstract
The (Sn-SnO2)-NPh-CPE modified electrode at based Microparticles of tin and tin oxide scattered on natural phosphate were utilized for amoxicillin (AMX) oxidation, it was preceded by an activation phase using ultraviolet radiation (UV) as the catalytic step before its electrochemical detection. The (Sn-SnO2)-NPh modifier was prepared via a solid-state reaction process at a high temperature of 400 °C using natural phosphate and tin dichloride. The AMX activation by UV radiation was studied using differential pulse voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Thus, the results confirm that the utilization of UV radiation catalyzed AMX oxidation. It has been found that the oxidation current of AMX increases with the increasing exposure time of AMX solution to UV radiation. The results demonstrated that the activation of the AMX by UV radiation before the electrochemical oxidation is necessary for its detection at the trace level. The oxidation peak current was linear to the AMX concentration in the range 2.0 × 10−7 to 2.0 × 10−6 mol/L with a detection limit of 7.78 × 10−8 mol/L. Moreover, the designed sensing platform was successfully employed to determine AMX in tap water and wastewater samples.
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