Application of Quasi-2D Hybrid Halide Perovskite-Molecularly Imprinting Photoelectrochemical Sensor for Determination of Cypermethrin in Vegetables
Quasi-2D hybrid lead cesium bromide perovskite thin films were prepared on ITO glass (OLHP/ITO) by liquid-phase method. On this basis,by using cypermethrin as the template molecule,hexafluorobutyl methacrylate as the monomer,divinylbenzene as the crosslinking agent,and 2,2'-azobisisobutyronitrile (AIBN) as photoinitiators,the perovskite molecularly imprinted modified electrode (MIP/OLHP/ITO) that could specifically recognize cypermethrin was obtained through UV polymerization. The results of scanning electron microscopy,X-ray diffraction and other tests indicated that the prepared modified electrode had a flat structure,small defects,strong photoelectric effect,and good moisture resistance. In the range of 1.0×10-6-1.0×10-10 mol/L,the logarithm of the concentration of cypermethrin exhibited a good linear relationship with the difference between the photocurrents of the standard samples and the blank (ΔI). The linear equation was ΔI=9.911lgC+102.83 (R2=0.997),and the limit of detection was 5.17×10-11 mol/L (S/N=3). In addition,the results of interference experiments,repeatability experiments,and spiked recovery experiments indicated that the constructed MIP/OLHP/ITO photoelectrochemical sensor had good selectivity,reproducibility and stability,and could be applied to determination of cypermethrin in actual vegetable samples. In summary,this study provided a rapid and simple method for determination of cypermethrin residual,and offered a new approach for application of quasi-2D organic hybrid lead cesium bromide perovskites in pollutant analysis.
万方数据
维普
