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Issue 39, 2018
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An electrochemical sensor based on Fe3O4@PANI nanocomposites for sensitive detection of Pb2+ and Cd2+

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Abstract

In this study, an easy-to-use electrochemical sensor was developed for the quantitative detection of lead ions (Pb2+) and cadmium ions (Cd2+). Core-shell ferroferric oxide@polyaniline (Fe3O4@PANI) nanoparticles were used as a sensitive platform for the detection of Pb2+ and Cd2+. Fe3O4 with large specific surface area could increase the sensitivity for detection. PANI as a conductive polymer with excellent electronic conductivity not only improved the electron transport speed in the detection process, but also produced good chelation with heavy ions. PANI contains a large number of amino and imino groups on its surface, thereby improving the detection sensitivity. Under optimal experimental conditions, the linear range for the detection of Pb2+ was from 0.1 to 104 nmol L−1; the detection limit was 0.03 nmol L−1, error limit of LOD was 1.1% and LOQ was 0.09 nmol L−1. The calculated LOD value of Cd2+ was 0.3 nmol L−1, the error limit of LOD was 1.5%, and LOQ was 0.9 nmol L−1. The prepared electrochemical sensor presented high sensitivity, good specificity and excellent stability; also, it is simple and easy to operate. This analysis strategy has a huge application prospect in the detection of other heavy metal ions.

Graphical abstract: An electrochemical sensor based on Fe3O4@PANI nanocomposites for sensitive detection of Pb2+ and Cd2+

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Publication details

The article was received on 31 May 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8AY01245H
Citation: Anal. Methods, 2018,10, 4784-4792
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    An electrochemical sensor based on Fe3O4@PANI nanocomposites for sensitive detection of Pb2+ and Cd2+

    Y. Kong, T. Wu, D. Wu, Y. Zhang, Y. Wang, B. Du and Q. Wei, Anal. Methods, 2018, 10, 4784
    DOI: 10.1039/C8AY01245H

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