Construction of Electrochemical Sensor Modified with Molecularly Imprinted Polymer and rGO-Fe۳O۴-ZnO Nanocomposite for Determination of Bisphenol A in Polymers and Water Samples

A modified molecularly imprinted polymer-carbon paste electrode (CPE) with rGO-Fe۳O۴-ZnO nanocomposite was constructed and used for the determination of Bisphenol A (BPA) using differential pulse voltammetry (DPV) technique. The rGO-Fe۳O۴-ZnOMIP/CPE shows a sharp and well-defined peak for the oxidation of BPA at ۶۴۸ mV in Britton-Robinson universal buffer solution pH = ۶.۵. The presented electrode shows a dynamic range of ۰.۰۰۸-۱۵ and ۱۵-۹۵ μM with the low detection limit of ۰.۰۰۴ μM. The repeatability, reproducibility, and stability of rGO-Fe۳O۴-ZnOMIP/CPE were checked and the obtained data confirm the excellent properties of the sensor. The selectivity of the presented method was investigated and the data show that Hydroquinone, Tert-butyl hydroquinone, Catechol and Bisphenol S and common ions had no disturbance on the detection of BPA and the changing in peak current was below ۵%. Finally, rGO-Fe۳O۴-ZnOMIP/CPE was successfully applied for the determination of BPA tap water, food storage container and cured vinyl ester resin samples with satisfactory results.

Keywords:

Bisphenol A , Molecularly imprinted polymer , Carbon paste electrode , rGO-Fe۳O۴-ZnO , Electrochemical determination