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In situ fabrication of hollow ZnO@NC polyhedra from ZIF-8 for the determination of trace Cd(II)

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Abstract

In this work, a novel electrochemical sensor for Cd(II) detection with differential pulse anodic stripping voltammetry (DPASV) is fabricated based on hollow ZnO@nitrogen-doped carbon (H-ZnO@NC) polyhedra, which are prepared from ZIF-8 via in situ tannic acid etching and a subsequent calcination process. The as-obtained H-ZnO@NC exhibits a polyhedral morphology with a well-defined hollow structure and a uniform distribution of elements C, N, O, and Zn in the shell. The unique structure of H-ZnO@NC can provide an enlarged surface area and abundant active sites. Moreover, ZnO has a strong affinity for heavy metals, which can enhance the adsorption capacity of H-ZnO@NC for Cd(II) in the accumulation step of stripping voltammetry, and thus improve the electrochemical sensing performances. As expected, the H-ZnO@NC-based sensor achieves a wide linear range of 0.3–300 μg L−1, a low detection limit of 0.1 μg L−1 (S/N = 3), and exhibits good selectivity as well as high stability and reproducibility. Moreover, the proposed electrochemical sensor can be applied for the determination of Cd(II) in real water samples, obtaining satisfactory results.

Graphical abstract: In situ fabrication of hollow ZnO@NC polyhedra from ZIF-8 for the determination of trace Cd(ii)

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Publication details

The article was received on 20 Mar 2018, accepted on 10 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8AN00515J
Citation: Analyst, 2018, Advance Article
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    In situ fabrication of hollow ZnO@NC polyhedra from ZIF-8 for the determination of trace Cd(II)

    X. Zhang, Q. Wang, J. Li, L. Huang, D. Yu and S. Dong, Analyst, 2018, Advance Article , DOI: 10.1039/C8AN00515J

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