Improving the Sensitivity of Fipronil Electrochemical Detection with Imprinted Polymers Polyaniline Modified of Nano FeO.TiO2

Fipronil, a widely used pesticide, has raised concerns due to its potential adverse effects on the environment and human health. To address this issue, developing sensitive detection methods for fipronil is crucial. This study focuses on a new electrochemical sensor based on nano ilmenite (FeO.TiO2) and polyaniline (PANi) molecularly imprinted polymers (MIP) for highly improving the sensitivity of fipronil detection. This study prepares a new electrochemical sensor by a simple surface modification of a molecularly imprinted polymer on GPE/FeO.TiO2 electrode. FeO.TiO2@MIP composites were modified on a graphene paste electrode (GPE/FeO.TiO2@MIP), and fipronil molecules were removed from PANi layers by cyclic voltammetry at the potential range of 0.8-1.2 V. The MIP was evaluated by scanning electron microscopy-energy dispersive X-ray (SEM-EDX) and subsequently ensured by cyclic voltammetry to verify the successful synthesis. The as-prepared electrode (encoded as GPE/FeO.TiO2@MIP) is greatly sensitive to fipronil solution, with a linear range from 0.1 to 1.0 mg/mL and a detection limit of 0.19 mg/mL. The proposed sensor presents an auspicious performance capable of effectively detecting insecticide remnants. It demonstrates exceptional sensitivity and high stability.