High sensitive and selective graphene oxide/molecularly imprinted polymer electrochemical sensor for 2,4-dichlorophenol in water

In this work a sensitive and selective electrochemical sensor based on molecularly imprinted polymer/graphene oxide (MIP/GO) modified glassy carbon electrode (GCE) for determination of 2,4-dichlorophenol (2,4-DCP) was developed. MIP was synthesized via precipitation polymerization, using 2,4-DCP as the template, methacrylic acid (MAA) as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent in the presence of an initiator, azodiisobutyronitrile (AIBN). Due to the high binding affinity and the π-π interaction, the MIP/GO/GCE showed high recognition and electrochemical activity towards 2,4-DCP. The influencing parameters during the experiment were investigated and optimized. Under the optimized conditions, the oxidation peak current and the concentration of 2,4-DCP had a good linear relationship in the range of 0.004–10.0 μM with a detection limit of 0.5 nM. The proposed sensor was successfully applied for determination of 2,4-DCP in real water sample.