A molecularly Imprinted Electrochemical Sensor Based on N-MWCNT/CPE for Highly Sensitive and Selective Detection of Bisphenol A

A sensitive and selective carbon paste electrode (CPE) for the detection of bisphenol A (BPA) was prepared using N doped multi-walled carbon nanotubes (N-MWCNT) as the electron transport accelerator and molecularly imprinted polymer (MIP) as the recognition element of BPA. In presence of the initiator of 2, 2′-azobis(isobutyronitrile) (AIBN), BPA was imprinted using acrylonitrile as a functional monomer and ethylene glycol dimethacrylate (EGDMA) as a cross-linker. The polymers of MIP and non-molecularly imprinted polymer (NIP) were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Under the optimized conditions, the oxidation peak current increases linearly with the increase of BPA concentration in the range of 0.05 – 90 μmol/L (R = 0.9991), and the detection limit was 11.8 nmol/L. MIP/N-MWCNT/CPE successfully detected BPA in the elution solution of a plastic bottle.