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Synthesis of strontium niobium–iron porphyrin nanocomposite for nitrite detection in river water

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Abstract

A layered FeTMPyP/Sr2Nb3O10 nanocomposite was successfully synthesized by intercalating positively charged 5,10,15,20-tetrakis (N-methylpyridinium-4-yl) porphyrinato iron (FeTMPyP) into KSr2Nb3O10 via exfoliation/restacking method. The structure and morphology of FeTMPyP/Sr2Nb3O10 nanocomposite was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy-dispersive spectrometer analysis (EDS), and Fourier transform infrared spectroscopy (FTIR). The FeTMPyP molecules are intercalated in the Sr2Nb3O10 layer with a tilt angle of 57°. The electrochemical properties of FeTMPyP/Sr2Nb3O10-modified electrode were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). The results show that FeTMPyP/Sr2Nb3O10 exhibits excellent performance for the electrochemical oxidation of nitrite. The possible mechanism for the electrochemical oxidation of NaNO2 on the FeTMPyP/Sr2Nb3O10-modified electrode was proposed. This modified electrode can detect nitrite in the concentration range of 0.02 to 1.35 mM with the detection limit of 1.2 μM. Moreover, this nanocomposite exhibits good stability and excellent anti-interference ability.

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Acknowledgements

This work was supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the 2019 Petrel Project of Lianyungang (2019-QD-014), the Jiangsu Provincial Key Laboratory of Advanced Material Function Control Technology Research Fund (jsklfctam201805), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX19_2256, KYCX20_2493).

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Correspondence to Zhiwei Tong.

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Wu, S., Wang, H., Zhao, B. et al. Synthesis of strontium niobium–iron porphyrin nanocomposite for nitrite detection in river water. J Nanopart Res 23, 151 (2021). https://doi.org/10.1007/s11051-021-05277-3

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  • DOI: https://doi.org/10.1007/s11051-021-05277-3

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