Non-Enzymatic Methyl Parathion Electrochemical Sensor Based on Hydroxyl Functionalized Ionic Liquid/Zeolitic Imidazolate Framework Composites Modified Glassy Carbon Electrode

A non-enzymatic methyl parathion (MP) electrochemical sensor was fabricated based on hydroxyl functionalized ionic liquid/zeolitic imidazolate framework composites modified glassy carbon electrode (IL-ZIF-67/GCE). Scanning electron microscopy (SEM) was used to study the surface morphologies of the modified electrodes. ZIF-67 could be well dispersed by hydroxyl functionalized ionic liquid. The structures of the modification materials were characterized using Fourier transform infrared spectroscopy (FT-IR). Square wave voltammetry (SWV) was employed to investigate the electrochemical behavior of MP. The factors affecting the performance of the proposed sensor were also optimized. The sensor makes full use of the high conductivity of hydroxyl functionalized IL and the superior electrocatalytic activity of ZIF-67, exhibiting excellent selectivity and stability. Under the optimal conditions, the IL-ZIF-67/GCE showed a good linear relationship for MP in the range of 1-20 ng l(-1), and the detection limit was as low as 0.5 ng l(-1) (S/N = 3). The sensor was applied for the detection of MP in river water samples, and the sample recoveries ranged from 96.6% to 101.2%.