Simultaneous voltammetric determination of cadmium(II), lead(II), mercury(II), zinc(II), and copper(II) using a glassy carbon electrode modified with magnetite (Fe3O4) nanoparticles and fluorinated multiwalled carbon nanotubes

文献类型： 外文期刊

第一作者： Wu, Wenqin

作者： Wu, Wenqin;Jia, Mingming;Wang, Zhongzheng;Zhang, Qi;Zhang, Zhaowei;Wu, Wenqin;Li, Peiwu;Zhang, Wen;Zhang, Qi;Li, Peiwu;Zhang, Wen;Zhang, Qi;Li, Peiwu;Liu, Guozhen;Li, Peiwu

作者机构：

关键词： Nanomaterial; Nafion; Electrochemical sensor; Electrochemical impedance spectroscopy; Square wave stripping voltammetry; Five heavy metal ions

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）

ISSN： 0026-3672

年卷期： 2019 年 186 卷 2 期

页码：

收录情况： SCI

摘要： A method is described for the simultaneous voltammetric determination of the heavy metal ions cadmium(II), lead(II), mercury(II), zinc(II), and copper(II) using a glassy carbon electrode (GCE) modified with magnetite (Fe3O4) nanoparticles and fluorinated multiwalled carbon nanotubes (Fe3O4/F-MWCNTs). The Fe3O4/F-MWCNT composite was synthesized by a hydrothermal method and characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, elemental mapping, electrochemical impedance spectroscopy, and square wave stripping voltammetry. Under the optimum conditions, the electrode displays excellent response to the ions. Figures of merit for Cd(II), Pb(II), Hg(II), Zn(II), and Cu(II), respectively, include (a) high electrochemical sensitivity (29.88, 43.50, 120.86, 47.34 and 90.31 (AM(-1)cm(-2)), (b) well separated peaks (at -0.70, -0.53, +0.37, -1.11 and+0.01V vs. Ag/AgCl); (c) low limits of detection (0.014, 0.0084, 0.0039, 0.012, and 0.0053M); and (d) wide linear ranges (0.048-30.0, 0.028-30.0, 0.013-32.5, 0.039-32.5, and 0.017-31.5M). The modified GCE displays satisfying selectivity in the presence of potentially interfering other metal ions, stability for 30days, and reproducibility of electrodes (with a relative standard deviation between 1.2 and 4.8% for n=6). The modified GCE was applied to the determination of several heavy metal ions in (spiked) water and rice samples, and the results agreed well with data obtained by atomic fluorescence spectrometry or inductively coupled plasma-mass spectrometry. The dramatic performance probably result from the semi-ionic C-F bond on F-MWCNTs surface with a strong negative charge, the good electrical conductivity of the F-MWCNTs and Fe3O4, the synergistic interaction between Fe3O4 and F-MWCNTs, and the nafion conductive membrane improving the stability of the modified layer and enhanced cation adsorption.

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