Metal-organic frameworks, quantum dots and their composite are used as electrochemical sensors at the surface of a gold electrode for bisphenol A (BPA) determination. Electrochemical response of the composite modified gold electrode shows excellence performance with a very low detection limit. The stability, reproducibility, and selectivity properties of the composite-modified electrode have been confirmed and ascertained. Real water sample analysis indicates that the fabricated composite modified electrode could be used for practical applications.

A modified gold electrode with metal-organic frameworks (MOFs), quantum dots (QTs) and their composite are fabricated to determine bisphenol A. The chemically modified sensors are characterized using ultraviolet-visible, Fourier transform infrared spectroscopy spectra, X-ray diffraction, scanning electron microscopy, and ransmission electron microscopy. Upon examining the electrochemical characteristics of the fabricated sensors, it is discovered that the QDs@MOFs conjugate performs better than the metal-organic frameworks and quantum dots, which could be attributed to the better conductivity of the conjugate. The effects of pH, accumulation time, and sensor concentration are studied at optimal condition. Over a wide range of bisphenol A (BPA) concentrations (1 μM–14 μM), the limit of detection is found to be 0.470 μM and the limit of quantitation is 1.425 μM. The results indicate that the electrochemical sensor fabricated from composite modified gold electrode is efficient for the detection of bisphenol A. The stability and reproducibility of the sensor are also evaluated.