One-pot electrodeposition of metal organic frameworks composite accelerated by gold nanoparticles and electroreduced carbon dots for electroanalysis of bisphenol A in real plastic samples

A sensitive electroanalysis of bisphenol A (BPA) based on a novel metal organic frameworks (MOFs) composite of MOFs, gold nanoparticles (AuNPs) and electroreduced carbon dots (ErCDs) was reported. The MOFs composite (AuNPs-ErCDs-MOFs) was in-situ prepared by one-pot electrodeposition approach. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectrometer (FT-IR), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) were used to show the properties of the composite. Interestingly, AuNPs, ErCDs, and AuNPs-ErCDs are found to significantly accelerate electrodeposition of MOFs, and used as good conductive agent to enhance the conductivity of MOFs composite. The electrochemical sensor shows wide linear range from 7.0 × 10−8 mol/L to 5 × 10−7 mol/L and 5 × 10−7 mol/L to 1.3 × 10−6 mol/L for BPA with a detection limit of 32 nmol/L (S/N = 3). In addition, the proposed sensor was also applied to test the BPA in plastic products with satisfactory recovery.