期刊
ANALYTICA CHIMICA ACTA
卷 1128, 期 -, 页码 174-183出版社
ELSEVIER
DOI: 10.1016/j.aca.2020.07.007
关键词
Lead ions; Electrochemical sensor; One-step; Integrated probe; Fast scan voltammetry; Sub-ppt detection
资金
- National Natural Science Foundation of China [81773483]
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products [ZS20190101]
- Science and Technology Department of Zhejiang Province of China [LGF19B050003]
- Ningbo Science and Technology Bureau [2019A610204, 2018A610401]
- Department of Education of Zhejiang Province [Y201941134]
- Ningbo University [XYL20001]
- K. C. Wong Magna Fund in Ningbo University
Herein, a one-step electrochemical sensor for selective and sensitive detection of lead ion Pb2+ was developed based on an integrated probe meso-tetra(4-carboxyphenyl) porphine (TCPP)-multi-walled carbon nanotubes (MWCNTs)@Fe3O4, which is TCPP-modified magnetic multi-walled carbon nanotubes. In the integrated probe, TCPP is a porphyrin with a specific cavity structure which could selectively chelate with Pb2+, MWCNTs with good electric conductivity provide a place to load TCPP and form a specific adsorption state of Pb2+ on the electrode surface, and Fe3O4 enables the rapid separation and one-step fabrication of the electrochemical sensor. Based on it, the sample pre-enrichment, separation and determination can be integrated, making the whole process very fast and simple. In addition, fast scan voltammetry (FSV) with a scan rate up to 200 V/s could be used to improve the detection sensitivity greatly, benefitting from the specific adsorption state formed. Under the optimal conditions obtained through orthogonal experiments including adsorption time, integrated probe dosage and solution pH, there was a good linear relationship between the peak current and Pb2+ concentration ranging from 2.0 x 10(-4) mu g L-1 to 2.0 x 10(-3) mu g L-1, with the limit of detection (LOD) being 6.7 x 10(-5) mu g L-1 (S/N = 3) i.e. 0.067 ppt. Analysis of actual water samples was successful. Therefore, being simple, fast, selective and sensitive, the one-step electrochemical sensor proposed has a good potential in practical applications. (C) 2020 Elsevier B.V. All rights reserved.
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