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Electrochemical detection of heavy metal ions in water using MWCNT/ZnO nanocomposite

International journal of electrochemical science, 2024-05, Vol.19 (5), Article 100559 [Peer Reviewed Journal]

2024 ;ISSN: 1452-3981 ;EISSN: 1452-3981 ;DOI: 10.1016/j.ijoes.2024.100559

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  • Title:
    Electrochemical detection of heavy metal ions in water using MWCNT/ZnO nanocomposite
  • Author: Zhou, Xiang
  • Subjects: Carbon nanocomposite ; Electrode modification ; Heavy metal detection ; Voltammetry ; Water analysis
  • Is Part Of: International journal of electrochemical science, 2024-05, Vol.19 (5), Article 100559
  • Description: A nanocomposite of multi-walled carbon nanotubes (MWCNTs) decorated with zinc oxide nanoparticles (ZnO NPs) was fabricated via an in-situ hydrothermal approach and implemented as a modified electrode for stripping voltammetric detection of dissolved heavy metal ions. The MWCNT/ZnO exhibited a high specific surface area of 53 m2/g and charge transfer conductivity amplified to 26 S/cm. By square wave voltammetry, the nanocomposite sensor achieved wide linear detection of Cu(II) from 1 to 800 ppb, Pb(II) from 5 to 1000 ppb, and Hg(II) from 1 to 900 ppb, along with low limits of detection reaching 0.8, 1.2, and 0.7 ppb, respectively. The 3–5X enhanced sensitivity versus an unmodified screen-printed carbon electrode confirms performance gains supplied by the tailored hybrid interface. Selectivity testing produced distinct, well-resolved oxidation peaks for each metal ion target that remained unaffected by high off-target concentrations of Mn(II), Co(II), and Fe(III) interferents. Accurate spike recoveries between 95% and 102% were obtained from quantifying ternary mixtures across various Cu(II):Pb(II):Hg(II) compositions, substantiating the capability for simultaneous multianalyte analysis. The simple preparation, high sensitivity and selectivity, and accuracy for direct water testing validates the nanocomposite as a practical portable sensor for on-site toxic heavy metal detection.
  • Publisher: Elsevier B.V
  • Language: English
  • Identifier: ISSN: 1452-3981
    EISSN: 1452-3981
    DOI: 10.1016/j.ijoes.2024.100559
  • Source: GFMER Free Medical Journals
    ROAD: Directory of Open Access Scholarly Resources
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