Multi-walled Carbon Nanotubes Modified Screen-Printed Electrode Coated Bismuth Oxide Nanoparticle for Rapid Detection of Cd(II) and Pb(II)

Paint has a variety of excellent properties containing anti-corrosion, waterproof, oil-proof, chemicalresistant, light-resistant, temperature-resistant. The wooden furniture covered with paint is commonly used to ensure their excellent quality. However, the soluble heavy metals in the paint exist on the surface of wooden furniture, endangering human health when they are enriched in human bodies. Therefore, an effective detection method is needed to analyze the contents of heavy metals in wooden furniture. Here, we designed and manufactured a disposable screen-printed electrode (SPE) for the Cd(II) and Pb(II) determination through square wave anodic stripping voltammetry, which used a special printed ink mixed multi-walled carbon nanotube and coated with bismuth oxide nanoparticle (BONP-MSPE). The characteristics of BONP-MSPE were studied using cyclic voltammetry, electrochemical impedance spectroscopy and square-wave stripping voltammetry, and then the detecting conditions were optimized. Under the optimal conditions, the values of peak currents of Cd(II) and Pb(II) increased linearly with the concentrations of Cd(II) and Pb(II). The linear ranges were from 0.5 to 40 μg/L for Cd(II) and 0.5 to 40 μg/L for Pb(II), with detection limits of 0.5 μg/L and 0.05 μg/L (S/N = 3), respectively, Lastly, the BONP-MSPE was further employed to measure the contents of Cd(II) and Pb(II) in pint samples analysis.