Zirconium‐based metal–organic framework and functionalized carbon black composite for simultaneous electrochemical detection of tert‐butylhydroquinone and butylhydroxyanisole

Abstract

In this paper, a porous zirconium‐based metal–organic framework (NH2‐UiO‐66) and functionalized carbon black (FCB) composite was prepared through a one‐pot hydrothermal method, and a novel electrochemical sensor based on NH2‐UiO‐66@FCB modified glassy carbon electrode (NH2‐UIO‐66@FCB/GCE) was developed for the simultaneous sensoring of butylhydroxyanisole (BHA) and tert‐butylhydroquinone (TBHQ). The morphology and structure of NH2‐UiO‐66@FCB were characterized through scanning electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectrum. The electrochemical behaviors of the NH2‐UiO‐66@FCB/GCE were investigated using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. Under optimized experimental conditions, the linear ranges for TBHQ and BHA detection were determined to be 0.12–460 μM and 0.7–420 μM, respectively, with their corresponding detection limits of 0.072 μM and 0.29 μM. Furthermore, the sensor exhibited excellent selectivity, repeatability and stability, and successfully used for the simultaneous detection of TBHQ and BHA in food samples.