Construction of a Sensitive Bisphenol A Electrochemical Sensor based on Metal-organic Framework/Graphene Composites

摘要

Bisphenol A (BPA), as a typical endocrine disruptor, has caused widespread concern in recent years,and its sensitive detection is particularly important. In this study, a sensitive BPA electrochemicalsensor was fabricated using composites of copper-based metal-organic frameworks (Cu-MOFs) andelectrochemically reduced graphene oxide (ERGO). The Cu-MOFs, ERGO, and Cu-MOFs/ERGOwere characterized by scanning electron microscopy. Compared with the Cu-MOFs- or ERGOmodified electrode, the Cu-MOFs/ERGO-modified electrode displayed significantly enhancedelectrocatalytic activity toward BPA. The prepared electrode displayed linear range from 0.02 μM to90 μM and limit of detection of 6.7 nM (S/N=3) for BPA detection as shown by differential pulsevoltammetry results under optimized conditions. Such good sensitivity could be ascribed to thesynergistic catalysis from high adsorption and catalytic capacity of Cu-MOFs and to the excellentconductive property of ERGO. The Cu-MOFs/ERGO-modified electrode also exhibited high stabilityand anti-interference ability. The proposed sensor was successfully applied to determine BPA inplastic products. Thus, a promising and reliable tool is provided for the rapid analysis of emergencypollution caused by BPA.