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

摘要

Paint has a variety of excellent properties containing anti-corrosion, waterproof, oil-proof, chemical-resistant, light-resistant, temperature-resistant. The wooden furniture covered with paint is commonlyused to ensure their excellent quality. However, the soluble heavy metals in the paint exist on the surfaceof wooden furniture, endangering human health when they are enriched in human bodies. Therefore, aneffective 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 inkmixed multi-walled carbon nanotube and coated with bismuth oxide nanoparticle (BONP-MSPE). Thecharacteristics of BONP-MSPE were studied using cyclic voltammetry, electrochemical impedancespectroscopy 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 withthe concentrations of Cd(II) and Pb(II). The linear ranges were from 0.5 to 40 μg/L for Cd(II) and 0.5 to40 μg/L for Pb(II), with detection limits of 0.5 μg/L and 0.05 μg/L (S/N = 3), respectively, Lastly, theBONP-MSPE was further employed to measure the contents of Cd(II) and Pb(II) in pint samplesanalysis.