期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 136, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2022.107233
关键词
Bismuth oxide surface-decorated nanoporous & nbsp;bismuth ; Square wave anodic stripping voltammetry; Electrochemical sensor; Heavy metal ions
资金
- Science and Technology Development Fund, Macau SAR [0023/2019/AKP, 0077/2019/A2]
- Department of Science and Technology of Guangdong Province
- Guangdong-Hong Kong-Macao Joint Laboratory of Respiratory Infectious Disease
- Department of Science and Technology of Guangdong Province
In this study, a novel bismuth oxide surface-decorated nanoporous bismuth (Bi2O3@NPBi) was prepared, which showed high cycling stability and capacity for sensitive detection of heavy metal ions with little interference from co-existing ions.
Ultrasensitive detection of heavy metal ions through electrochemical methods is a longstanding research topic. One of the most compelling subjects is preparation of modified electrodes with a high specific surface area as well as fast response characteristics. In this study, novel bismuth oxide surface-decorated nanoporous bismuth (Bi2O3@NPBi) was prepared through a typical dealloying method, where a bicontinuous ligament-channel structure greatly improved the electrically active surface area and electron conduction. The Bi2O3@NPBi-modified electrode was employed to detect heavy metal ions using square wave anodic stripping voltammetry (SWASV), and the corresponding limits of detection (LOD) were 0.02 and 0.03 mu g/L for simultaneous detection of Pb2+ and Cd2+. Due to the high cycling stability and capacity of bismuth oxides, the relative standard deviation (RSD) of the response currents using Bi2O3@NPBi was less than 4.16%, which is very considerably lower than the RSD of NPBi. Furthermore, a Bi2O3@NPBi-modified electrode was used to determine the concentration of Pb2+ and Cd2+ in tap water samples, and excellent recovery figures were obtained as there is little interference from other co-existing ions. In conclusion, the Bi2O3@NPBi-modified electrode showed good reusability and feasibility for quality assurance in agricultural, food and environmental applications.
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