期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 371, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132490
关键词
Biochar; L-Cysteine; Electrochemical sensor; Ultrasensitive determination; Heavy metal ions
资金
- National Key Research and Devel- opment Program of China [2019YFC1804800]
- National Natural Science Foundation of China [51809111]
A novel electrochemical sensor has been developed for ultrasensitive monitoring of (Pb)(2+) and Cd2+ using highly conductive ball milling biochar (BBC) as the conductive material and ion-imprinted polymer as specific binding moieties. The electrode exhibited low detection limits, wide linear ranges, anti-interference properties, and reusability.
A novel electrochemical sensor for the ultrasensitive monitoring of (Pb)(2+) and Cd2+ was developed by fabrication of highly conductive and target selective electrode using ball milling biochar (BBC) featured with high con-ductivity and rich oxygenic functional groups as the conductive material, and cavities of ion-imprinted polymer as specific binding moieties. The nanosized BBC was synthesized with process of high temperature pyrolysis and rigorous ball milling. The ion imprinted BBC electrode was constructed by in situ electropolymerization of L-Cysteine and template metal ions on the BBC that was modified on glassy carbon, and subsequent removal of templates. The BBC presented great electron transfer ability, and contained increased oxygenic compounds than the mild ball milling prepared one, which attributed to formation of stable and cavity-rich imprinting polymer layer and enhancement of sensing signal. With the anodic dissolved differential pulse voltammetry, the electrode could detect extremely low levels of Pb2+ and Cd2+ with lowest detection limits of 5.86 fM and 0.883 aM, and the linear ranges were 25 fM -1 mu M and 0.1 fM -1 mu M, respectively. The electrode also presented anti-interference to other irrelevant ions and organic compounds, and could reuse at least seven times without decrease of sensing signal.
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