An Electrochemical Sensor Of Poly(Edot-Pyridine-Edot)/Graphitic Carbon Nitride Composite For Simultaneous Detection Of Cd2+ And Pb2+

In this study, poly(2,5-bis(3,4-ethylenedioxythienyl) pyridine)/graphitic carbon nitride composites (poly(BPE)/g-C3N4) were prepared by an in situ chemical polymerization method. Composites were characterized by using Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectra (UV-vis), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Furthermore, electrochemical sensors were applied for the electrochemical determination of Cd2+ and Pb2+ using the differential pulse voltammetry (DPV) method. The results indicated that 10 wt % poly(BPE)/g-C3N4 composite-modified electrode exhibited linear detection ranging from 0.12 to 7.2 mu M and 0.08 to 7.2 mu M for Cd2+ and Pb2+, with detection limits (S/N = 3) of 0.018 mu M and 0.00324 mu M. Interference analysis suggested that the 10 wt % poly(BPE)/g-C3N4-modified electrode can be applied for the detection of the Cd2+ and Pb2+ in real samples.