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

Journal Article

, Palanisamy, S., Kokulnathan Thangavelu, Shen-Ming Chen, Vijayalakshmi Velusamy, Min-Hui Chang, Tse-Wei Che, Fahad M.A. Al-Hemaid, M.A. Ali, Sayee Kannan Ramaraj . 2017

• Publication Work Type: Research work
• Publication Online URL: Synthesis and characterization of polypyrrole decorated graphene/β-cyclodextrin composite for low level electrochemical detectio
• Magazine \ Newspaper: Sensors and Actuators B: Chemical
• Issue Number: 2017
• Volume Number: 243
• Pages: 888–894

Publication Abstract

tMercury (Hg(II)) is considered as one of the most toxic element that directly affects the human healthand the environment. Therefore, in this study, we propose a sensitive and disposable electrochem-ical sensor for the detection of Hg(II) in various water samples using polypyrrole (PPy) decoratedgraphene/-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 thatGR-CD/PPy composite modified SPCE has high sensitivity towards Hg(II) than bare, GR, GR-CD and PPymodified SPCEs. The optimization studies such as effect of pH, accumulating time and effect of scanningpotential towards the detection of Hg(II) were investigated. The GR-CD/PPy composite modified SPCEcould detect the Hg(II) up to 51.56 M L−1with the limit of detection (LOD) of 0.47 nM L−1. The obtainedLOD 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 SPCEselectively detected the Hg(II) in the presence of potentially interfering metal cations.