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

SENSORS AND ACTUATORS B-CHEMICAL

卷:243

Article

Palanisamy, Selvakumar¹  Thangavelu, Kokulnathan¹  Chen, Shen-Ming^1,3  Velusamy, Vijayalakshmi²  Chang, Min-Hui¹  Chen, Tse-Wei¹  Al-Hemaid, Fahad M. A.³  Ali, M. Ajmal³  Ramaraj, Sayee Kannan⁴ 

[1] Natl Taipei Univ Technol, Dept Chem Engn & Biotechnol, Taipei 106, Taiwan

[2] Manchester Metropolitan Univ, Sch Engn, Div Elect & Elect Engn, Manchester M1 5GD, Lancs, England

[3] King Saud Univ, Dept Bot & Microbiol, Coll Sci, Riyadh 11451, Saudi Arabia

[4] Thiagarajar Coll, PG & Res Dept Chem, Madurai 09, Tamil Nadu, India

关键词: Screen printed carbon electrode;    Graphene;    beta-cyclodextrin;    Polypyrrole;    Mercury (II);    Health and environment;   

DOI  :  10.1016/j.snb.2016.12.068

来源: Elsevier

【 摘 要 】

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/beta-cyclodextrin (GR-CD) composite modified screen-printed carbon electrode (SPCE). The GRCD/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 mu M L-1 with 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. (C) 2016 Elsevier B.V. All rights reserved.

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