An Electrochemical Sensor Based on Pd/g-C3N4 for Simultaneous Detection of Luteolin and Vanillin
As a new type of non-metallic semiconductor catalyst,graphite phase carbon nitride(g-C3N4)has numerous outstanding properties such as good chemical stability,simple preparation process and low cost.However,the small specific area and poor conductivity of g-C3N4 limit its application in electrochemical sensors.In order to solve this problem,metal nanoparticles were modified on the surface of g-C3N4 by doping modification.First,tubular g-C3N4 was prepared by thermal condensation.Then,palladium(Pd)-doped g-C3N4 composites(Pd/g-C3N4)were prepared by hydrothermal method.Finally,Pd/g-C3N4 modified electrode was constructed for simultaneous determination of luteolin(LU)and vanillin(VA).The morphology,structure and purity of Pd/g-C3N4 were characterized by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The electrochemical behavior of LU and VA on Pd/g-C3N4 modified electrode was studied by cyclic voltammetry(CV)and differential pulse voltammetry(DPV).Under the optimal conditions,the DPV method was used to detect LU and VA simultaneously.The linear relationship between the peak current and the concentration was between 0.5 and 10 μmol/L,and the detection limit was 0.1 μmol/L.
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