Quantitation of Chlorpyrifos Sensitive Voltammetric Electrode Based on Graphene Decorated Spherical TiO2

A Grafen-TiO2 anatase (G-TiO2) nanocomposite-based voltammetry electrode has been successfully developed to detect chlorpyrifos pesticide residues. These electrodes utilize titanium dioxide (TiO2) anatase as the main material, which is synthesized through the sol-gel method. The synergistic effect between graphene and TiO2 (2:1 w/w) provides a significant improvement in electrode sensitivity, selectivity, and stability. Material characterization using FTIR, SEM, and XRD evaluated the success of the synthesis described by the presence of metal oxide interactions, homogeneous particle distribution, and the formation of a stable structure. Cyclic voltammetry electrochemical performance testing showed a sensitive detection response with detection limit (LOD) and quantization (LOQ) values of 0.80 mu g/L and 2.68 mu g/L, respectively. The linear relationship between peak current and the concentration of chlorpyrifos 1-11 mu g/L indicates outstanding electrode performance with the acquisition of a determination coefficient value of R-2 = 0.9993. In addition, these electrodes have excellent precision and stability through the representation by values % RSD repeatability and reproducibility of 1.04% and 0.41%, respectively. The influence of interfering compounds profenofos did not have a significant effect on the detection of chlorpyrifos pesticides. This research report proves that G-TiO2 electrodes have superior ability for wide application as potential scanning agents for monitoring pesticide residues in the environment.