Preparation of manganese porphyrin/niobium tungstate nanocomposites for enhanced electrochemical detection of nitrite
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The sandwich-structured MnTMPyP/NbWO6 nanocomposites were synthesized by the electrostatic self-assembly of the manganese porphyrin (MnTMPyP) cations with the exfoliated niobium tungstate [NbWO6]− nanosheets. Various analytical techniques such as X-ray diffraction patterns, scanning electron micrograph, transmission electron microscope, energy-dispersive spectroscopy, UV–Vis absorption spectra and Fourier transform infrared spectra were used to determine the structure, composition and morphology of the as-prepared samples. It can be concluded that MnTMPyP cations were inserted into interlayer spacing of the [NbWO6]− nanosheets and arranged in an inclined single layer at 58°. The MnTMPyP/NbWO6 nanocomposites modified electrode exhibited excellent electro-catalytic oxidation activity toward nitrite in 0.2 mol L−1 and pH 7.0 phosphate buffer solution. Additionally, the oxidation peak current is proportional to the square root of scan rates, indicating that the redox reaction of nitrite is a typical diffusion-controlled process. Also, the sensitivity and detection limit for nitrite at the modified electrode was evaluated as 3.80 × 10−5 mol L−1 over a concentration range from 1.20 × 10−4 to 3.57 × 10−3 mol L−1 by using differential pulse voltammetry.
This work was supported by Natural Science Foundation of Jiangsu Province (BK20161294, BK20160434), Lianyungang Science Project (CG1602), the University Science Research Project of Jiangsu Province (15KJB430004), Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX18_2607), the Jiangsu Marine Resources Development and Research Institute (LYG52105-2018045), China Postdoctoral Science Foundation (2018M632283), Industry-University-Research Collaboration Project of Jiangsu Province (BY2018281), and Huaihai Institute of Technology Graduate Practice Innovation Project (XKYCXX2017-5).
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Conflict of interest
All authors declare that they have no conflict of interest.
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