摘要：

A new kind of electrode composed of FeAl₂O₄ nanoparticles, γ-AlOOH, and reduced graphene oxide (rGO) was prepared for the simultaneous determination of Cd(II) and Pb(II) in aqueous solution using square wave anodic stripping voltammetry (SWASV). γ-AlOOH was employed to modify rGO to obtain a platform for distributing FeAl₂O₄ particles uniformly. The phase and structure of the FeAl₂O₄-AlOOH-rGO composites were characterized using scanning electron microscope (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD) patterns, and Fourier-transform infrared spectroscopy (FTIR). The electrochemical properties were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results indicate that the combination of AlOOH and rGO may provide a better electrochemical behavior due to excellent adsorption ability of AlOOH and large surface area of rGO. Electrochemical parameters such as supporting electrolyte, pH value, deposition potential, deposition time, and concentration of Bi³⁺ affecting the deposition and stripping of metal ions were also studied. The electrode exhibits wider detection linear range and lower determination limit toward simultaneous determination of Cd(II) and Pb(II). It further possesses good reproducibility and stability.

展开