Abstract
Ag-Ag2O-decorated multiwall carbon nanotube/NiCoAl-hydrotalcite (CNT/LDH-Ag) composites were designed and synthesized for nitrite quantification. The materials were characterized by various techniques, and their electrochemical NO2− detection performances investigated using amperometric and differential pulse voltammetry (DPV) techniques. The Ag-Ag2O nanoparticles (NPs) were anchored on the surface of the CNT/LDH-Ag composites. At a suitable amount of the Ag-Ag2O loading, the Ag-Ag2O NPs with small particle size were distributed evenly on the CNT/LDH surface, increasing the surface area of the composites. The optimal CNT/LDH-Ag3 composite exhibited a high electrochemical activity for NO2− oxidation in pH 7.0. Furthermore, the optimal CNT/LDH-Ag3 composite was fabricated for trace NO2− quantification. The proposed sensor displayed a high sensitivity (0.0960 μA·μM−1·cm−2) and fast response (< 3 s) toward NO2− in a wide linear range from 0.250 μmol·L−1 to 4.00 mmol·L−1 with a low detection limit of 0.0590 μmol·L−1(S/N = 3). The sensor provided an outstanding analytical performance with a desirable recovery (95.3 ~ 107%, RSD < 1.05%) in real sample. As a result, the proposed sensor can be used for the real-time quantification of trace NO2− in the biological, food, and environmental fields.
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This work was financially supported by the Scientific Research Fund of Hunan Provincial Education Department (20A480) and Key Research and Development Program of Hunan Province (2018SK20110).
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Kai Zhang: writing — reviewing, software and editing, data curation. Hong-Yan Zeng: conceptualization, methodology, supervision. Ming-Xin Wang: visualization, writing — original draft preparation. Zhen Li: visualization, investigation.
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Zhang, K., Wang, MX., Zeng, HY. et al. Ag-Ag2O decorated multi-walled carbon nanotubes/NiCoAl hydrotalcite sensor for trace nitrite quantification. Microchim Acta 189, 411 (2022). https://doi.org/10.1007/s00604-022-05513-0
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DOI: https://doi.org/10.1007/s00604-022-05513-0