An Electrochemical Sensor Based on Multi-Walled Carbon Nanotubes Functionalized With 2-Picolinyl Hydrazide for Electrochemical Detection of Pb(II) Ions

An new electrochemical sensor was constructed with the nanometer coaxial cable, which was prepared based on Multi-walled carbon nanotubes (MWCNTs) and pyridine. the analysis of trace Pb(II) with differential pulse anodic stripping voltammetry (DPASV) was studied. The MWCNTs–TPI–2–Ph was characterized by SEM, TEM and electrochemical method. Various parameters such as deposition time, pH values, deposition potential, interference experiment, stability and reproducibility were invesitgated. DPASV was used for evaluating the detection of trace Pb(II) based on the accumulation process. Under the optimal conditions, the MWCNTs–TPI–2–Ph/GCE showed excellent stripping response of Pb(II) in the ranges of 1 to 100 μmol L-1, the peak currents linearly increased with the concentration of Pb(II). The detection limit was calculated to be 0.03 μM (S/N=3). Detection mechanism toward Pb(II) based on MWCNTs–TPI–2–Ph/GCE was proposed. Therefore, it was important to design an electrochemical sensor based on new metal ions capture reagent.