Development of an Electrochemical Sensor Based on Nanocomposite of Fe3O4@SiO2 and Multiwalled Carbon Nanotubes for Determination of Tetracycline in Real Samples

In this work, an electrochemical sensor (GCE/MWCNT/Fe3O4@SiO2) based on a composite of multiwalled carbon nanotubes (MWCNT) and Fe3O4@SiO2 (MMN) nanocomposite glassy electrode (GCE) was developed for the detection tetracycline (TC). The formed promoted increased signal stability sensor, combining its individual characteristics such as high electrical conductivity large surface area. material characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy, scanning electron microscope (SEM). adsorptive stripping differential pulse voltammetry (AdSDPV) better performance greater sensitivity TC detection. Under optimized conditions, currents linearly with concentrations from 4.0 to 36 µmol L−1 (0.997) 40 64 (0.994) quantification limits 1.67 L−1, respectively. applied in analysis milk river water samples, obtaining recovery values ranging 91–117%.