Ultra-sensitive simultaneous electrochemical detection of Zn(II), Cd(II) and Pb(II) based on the bismuth and graphdiyne film modified electrode

Abstract

In this paper, a new dendritic bismuth and graphdiyne (Bi/GDY) film was fabricated on the surface of glassy carbon electrode (GCE) with a facile casting and electrodeposition procedure, which possessed significantly large active area, binding strength on electrode interface and fast electron transfer ability. The modified electrode was acted as an ultra-sensitive electrochemical sensor for individually and simultaneously assay of Zn(II), Cd(II) and Pb(II) by using differential pulse anodic stripping voltammetry (DPASV). As a result, the ultra-low detection limits (0.115 nM of Zn(II), 0.171 nM of Cd(II) and 0.146 nM of Pb(II), S/N = 3) and a wide linear concentration range from 10.0 nM to 100.0 μM were obtained. The constructed sensor exhibited excellent repeatability, reproducibility, stability and could be used to sensitive detect real seawater sample. The analytical results of Bi/GDY/GCE was further verified via atomic absorption spectroscopy. Therefore, Bi/GDY-based electrochemical sensor possesses great potentials for advanced applications in environment, biomedicine and food fields.