Detection of sulfamethoxazole by cyclic voltammetric method based on BiOI/g-C3N4 modified electrode

The g-C3N4 nanosheet was obtained by high-temperature calcination of urea with thermal polymerization, and the BiOI/g-C3N4 composites were obtained by a solvothermal method. The microstructure and morphology of the BiOI/g-C3N4 nanocomposites were verified by different techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared (FT-IR) spectroscopy. The electrochemical sensing platform for the rapid detection of sulfamethoxazole (SMX) was constructed by drop-coating the BiOI/g-C3N4 composites on the surface of a glassy carbon electrode (GCE). SMX was detected by cyclic voltammetry (CV) and differential pulsed voltammetry (DPV), and the peak current increased linearly with SMX concentration in the linear range of 5-1000 μmol/L, with a limit of detection of 0.025μmol/L. The spiked recoveries of SMX in tap water samples ranged from 90.0% to 103.4%. © 2024, Youke Publishing Co.,Ltd. All rights reserved.