A highly sensitive and selective electrochemical sensor based on polydopamine functionalized graphene and molecularly imprinted polymer for the 2,4-dichlorophenol recognition and detection

In this work, a sensitive and selective electrochemical sensor based on polydopamine-reduced graphene oxide (PDA-rGO) and molecular imprinted polymers (MIP) modified glassy carbon electrode for detection of 2,4-DCP was fabricated. The PDA-rGO was obtained through the auto polymerization of dopamine in graphene oxide solution at an alkaline environment. The MIP film was performed on the surface of the PDA-rGO modified electrode by electropolymerization the monomer of o-phenylenediamine (o-PD) with the template of 2,4-dichlorophenol (2,4-DCP). The bare hydroxyl and benzene rings of PDA-rGO could attract positive charged o-PD and provide π-π stacking effect with o-PD and 2,4-dichlorophenol, which made the compact imprinted film and more imprinted sites. The Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to character the MIP and NIP modified electrode in the presence of [Fe(CN)6]3-/[Fe(CN)6]4- as a probe for signal transduction. The relative current intensity of ferro/ferricyanide decreased linearly with increasing concentration of 2,4-DCP with a detection limit of 0.8 nM (S/N = 3). The MIP sensor had a much higher affinity towards 2,4-DCP than other analogues. The proposed method was successfully applied for the determination of 2,4-DCP in real water samples. In this work, polydopamine-reduced graphene oxide (PDA-rGO) was synthesized through the auto polymerization of dopamine in graphene oxide solution. The Molecular imprinted film was performed on the surface of the PDA-rGO modified electrode by electropolymerization o-phenylenediamine with the template of 2,4-dichlorophenol (2,4-DCP). Based on this sensor surface, a highly sensitive and selective electrochemical sensor for 2,4-DCP in real sample was developed. [Display omitted] •A molecular imprinted polymer of 2,4-DCP was prepared on the polydopamine functionalized graphene (PDA-rGO) modified electrode surface.•A molecular imprinted electrochemical sensor of 2,4-DCP was fabricated and investigated.•The sensor showed high sensitive and fast mass transfer properties and make a rapid and sensitive of detection of 2,4-DCP in water samples.