期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 243, 期 -, 页码 888-894出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.068
关键词
Screen printed carbon electrode; Graphene; beta-cyclodextrin; Polypyrrole; Mercury (II); Health and environment
资金
- International Scientific Partnership Program ISPP at King Saud University [ISPP 6]
- Ministry of science and technology of Taiwan (Republic of China)
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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