Study on the application of iron porphyrin/niobium molybdate composite for determination of nitrite

In this study, a sandwich-structured FeTMPyP/NbMoO6 composite was synthesized by inserting iron porphyrin (5, 10, 15, 20-tetrakis (N-methylpyridinium-4-yl) porphyrinato iron, abbreviated as FeTMPyP) into LiNbMoO6 using exfoliation/restacking method. Then the morphology and structural composition of FeTMPyP/NbMoO6 composite were characterized by using X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron microscope (TEM), energy-dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The results show that FeTMPyP molecules are intercalated into [NbMoO6]- laminates forming a monomolecular layer, and the angle of inclination is 50.35°. In addition, FeTMPyP/NbMoO6/GCE shows good electrochemical oxidation performance for nitrite through a series of electrochemical tests, and the detection limit is 7.4 μΜ. Meanwhile, FeTMPyP/NbMoO6/GCE exhibits good stability and anti-interference ability.