Synthesis and characterization of polypyrrole decorated graphene/β-cyclodextrin composite for low level electrochemical detection of mercury (II) in water

Selvakumar Palanisamy, Kokulnathan Thangavelu, Shen Ming Chen, Vijayalakshmi Velusamy, Min Hui Chang, Tse Wei Chen, Fahad M.A. Al-Hemaid, M. Ajmal Ali, Sayee Kannan Ramaraj

    Research output: Contribution to journalArticlepeer-review

    87 Scopus citations

    Abstract

    Mercury (Hg(II)) is considered as one of the most toxic element that directly affects the human health and the environment. Therefore, in this study, we propose a sensitive and disposable electrochemical sensor for the detection of Hg(II) in various water samples using polypyrrole (PPy) decorated graphene/β-cyclodextrin (GR-CD) composite modified screen-printed carbon electrode (SPCE). The GR-CD/PPy composite was synthesized by chemical oxidation of PPy monomer in GR-CD solution using FeCl3. Differential pulse voltammetry (DPV) is used for the detection of Hg(II) and the DPV results reveal that GR-CD/PPy composite modified SPCE has high sensitivity towards Hg(II) than bare, GR, GR-CD and PPy modified SPCEs. The optimization studies such as effect of pH, accumulating time and effect of scanning potential towards the detection of Hg(II) were investigated. The GR-CD/PPy composite modified SPCE could detect the Hg(II) up to 51.56 μM L−1with the limit of detection (LOD) of 0.47 nM L−1. The obtained LOD was well below the guideline level of Hg(II) set by the World's Health Organization (WHO) and U.S. Environmental Protection Agency (EPA). In addition, the fabricated GR-CD/PPy composite modified SPCE selectively detected the Hg(II) in the presence of potentially interfering metal cations.

    Original languageBritish English
    Pages (from-to)888-894
    Number of pages7
    JournalSensors and Actuators, B: Chemical
    Volume243
    DOIs
    StatePublished - 2017

    Keywords

    • Graphene
    • Health and environment
    • Mercury (II)
    • Polypyrrole
    • Screen printed carbon electrode
    • β-cyclodextrin

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