Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 332, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129519
Keywords
Graphdiyne; Cd2+; Pb2+; Anodic-stripping voltammetry; Electrochemical determination; Heavy metal ions
Funding
- National Basic Research Program of China [2016YFA0203200]
- National Key Research and Development Program of China [2018YFA0703504]
- National Natural Science Foundation of China [11705211, 21971242]
- Young Scientist Innovative Foundation of IHEP [E05469U2, Y95461C]
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Graphdiyne, a new carbon allotrope, showed efficient electrochemical sensor capability for detecting low concentrations of Cd2+ and Pb2+ in water. The study verified that acetylenic links in graphdiyne served as adsorbent sites for heavy metal ions, enhancing the sensor performance. This platform offers a promising direction for developing novel electrochemical sensors with high performance.
In this work, graphdiyne, a new kind of carbon allotrope composed of sp and sp(2) hybridized carbon atoms, firstly worked as an effective electrochemical sensor for the determination of low concentration of Cd2+ and Pb2+ in water using electrochemical pre-enrichment and anodic-stripping voltammetry methods. The limit of detection was 0.46 nM for Cd2+ and 1.72 nM for Pb2+ with a linear range extended from 0.01 mu M to 1 mu M. This graphdiyne modified electrode also presented excellent selectivity, stability, applicability and reproducibility, providing a simple and promising platform to develop novel electrochemical sensor for detecting Pb2+ and Cd2+ with higher performance. Through X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) and X-ray absorption near edge structure (XANES) characterization, it was verified that the acetylenic links in graphdiyne served as adsorbent sites by providing electrons to bind with heavy metal ions, which enhanced the electrochemical sensing performance.
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