Hg2+ determination by DPASV by using poly (methylene disulfide)/Au nanoparticle/MWCNT modified glassy carbon electrode by differential pulse anodic stripping voltammetry (DPASV) technique

In the present work, a glassy carbon electrode (GCE) was surface modified by a poly (methylene disulfide)/Au–nanoparticles/multiwall carbon nanotubes (PMDS/AuNPs/MWCNT) to improve its ability to detect of trace mercury cations in polluted water. The produced electrode was characterized with FE-SEM, HR-TEM, AFM, XRD, and FT-IR techniques. The obtained results proved the success of the modification process and revealed that the process had a significant effect on the morphology of the electrode and its surface roughness. EIS analysis demonstrated the improvement of the electrochemical properties of the surface-modified sample. Accordingly, the obtained charge transfer resistance (Rct) decreased from 477.1 Ohm cm2 for the unmodified GCE to 83.4 Ohm cm2 for the modified-GCE. The designed modified electrode was used as an ultra-sensitive electrode for determining the concentration of Hg2+ cation using the differential pulse anodic stripping voltammetry (DPASV) technique.