期刊
MICROCHEMICAL JOURNAL
卷 179, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.microc.2022.107515
关键词
Shuttle-like alpha-Fe2O3; beta-Bi2O3 microspheres; Cd2+; Pb2+; Heavy metal ions
资金
- Natural Science Foun-dation of Hunan Province [2021JJ30226, 018JJ3134]
- Scientific Research Foundation of Hunan Provincial Education Department [21B0532,18C0522]
- Special Project of 2020 Social Develop-ment and Transformation of Scientific and Technological Achievements, Zhuzhou Science and Technology Bureau [2020-015]
A cost-effective voltammetric sensor was designed using Fe2O3/Bi2O3 nanocomposites for the simultaneous determination of toxic heavy metal ions Cd(II) and Pb(II). The sensor showed wide dynamic range, excellent selectivity, and stability.
Simultaneous determination of multiple heavy metal ions (HMIs) at trace level is of great significance for the environmental protection. Herein, a cost-effective voltammetric sensor was designed for the simultaneous determination of toxic Cd(II) and Pb(II) using shuttle-like alpha-Fe2O3 nanoparticles decorated beta-Bi2O3 microspheres. After introducing the Fe2O3/Bi2O3 nanocomposites, the electroactive surface area and roughness factor increased significantly. The Fe2O3/Bi2O3 nanocomposites exhibited superior electrocatalytic activity than other modified electrodes, probably because the synergistic interaction between Fe2O3 and Bi2O3 greatly facilitated the deposition-stripping process. The Fe2O3/Bi2O3/GCE realized the simultaneous determination of nanomolar Cd (II) and Pb(II) with a wide dynamic range of 0.002-4 mu M. Moreover, the Fe2O3/Bi2O3 nanocomposites showed robust stability in the voltammetric responses up to three weeks and excellent selectivity against the potential interfering such as metal ions and biomolecules. The Fe2O3/Bi2O3/GCE was successfully employed to simultaneously detect Cd2+ and Pb2+ from water and milk samples with good recovery.
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