Electrochemical Sensing of Migrating Nonylphenols in Food Packaging Based on Double-ligand Metal-organic Frameworks
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Abstract:
An electrochemical sensor based on Fe-based metal-organic framework supported on highly conductive graphene (Fe-HHTP-HITP-HCG) was prepared for the determination of trace nonylphenol (NP). Double-ligand metal-organic framework (Fe-HHTP-HITP) was grown in the empty spaces of highly conductive graphene (HCG) to form Fe-HHTP-HITP-HCG, and the electrochemical sensor was then made by drop-coating to form a film. The experimental conditions, namely the type of buffer, pH value, ligand ratio, HCG ratio, cumulative potential and cumulative time were investigated. The properties of the electrodes were evaluated through the use of cyclic voltammetry (CV), field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results of the experiments showed that Fe-HHTP-HITP-HCG had high electrochemical and catalytic activity and has good response. When the coating was four layers, the detection concentration of NP ranged from 1.0×10-7 to 1.0×10-4 mol/L, and the limit of detection was 1.22×10-8 mol/L. When the sensor was applied to NP that migrated from the milk bag, the standard addition recovery rate ranged from 96.90% to 102.00%. Based on these results, a new strategy for NP-sensitive detection using metal-organic framework composites is proposed.
