Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 243, Issue -, Pages 888-894Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.068
Keywords
Screen printed carbon electrode; Graphene; beta-cyclodextrin; Polypyrrole; Mercury (II); Health and environment
Funding
- International Scientific Partnership Program ISPP at King Saud University [ISPP 6]
- Ministry of science and technology of Taiwan (Republic of China)
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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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