A simple and sensitive electrochemical sensor based on amine-functionalized metal-organic framework and polypyrrole composite for detection of lead ion in meat

Abstract

Abstract In this study an electrochemical device for lead ion based on an amine-functionalized Zr (IV) metal-organic framework (UiO-66-NH2) and polypyrrole (PPy) composite nanomaterials were prepared. The morphological characteristics and internal structural information of UiO-66-NH2@PPy composites were obtained through instruments such as scanning electron microscopy (SEM), high-resolution transmission electron microscope (TEM), multifunctional high-resolution X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectrometer (XPS), nitrogen adsorption/desorption analyzer, and thermogravimetric analyzer (TGA). The outstanding electrochemical performance of the electrochemical device prepared was attributed to the large specific surface area and abundant amino binding sites of UiO-66-NH2, and the excellent conductivity of PPy. Under optimal experiment conditions, the detection limit of the electrochemical device for lead ions is as low as 0.05 µg/L, with a good response in the linear range of 0.1–256 µg/L. Finally, we used this sensor to detect the content of lead ions in pig kidneys and compared it with standard methods. The results show that our sensor is simple, reliable and provides an alternative solution for the analysis of lead ions in meat.