Journal
ANALYTICA CHIMICA ACTA
Volume 1116, Issue -, Pages 16-26Publisher
ELSEVIER
DOI: 10.1016/j.aca.2020.04.033
Keywords
Biomass; Nitrogen-doped-carbon framework; Bismuth film; Stripping voltammetry; Lead (II)
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Funding
- National Natural Science Foundation of China [21605015, 81301345, 81871506]
- Development Project of Science and Technology of Jilin Province [20170101176JC]
- Fundamental Research Funds for the Central Universities [JGPY201802]
- Jilin Provincial Department of Education
- Analysis and Testing Center of Northeast Normal University
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The worm-like nitrogen-doped-carbon framework (WNCF) with abundant edge-plane-like defective sites (EDSs) was synthesized by using natural wax gourd (Benincasa hispida) as the main carbon precursor and milk yielded by Chinese Holstein cattle (Holstein Friesian) as the nitrogen precursor for the first time. The Nafion-dispersed WNCF (Nafion-WNCF) was employed to design a highly sensitive electrochemical sensor for the trace determination of toxic heavy metal lead (II) (Pb2+) by the differential pulse anodic stripping voltammetry (DPASV). Some key experimental factors including calcination temperature of WNCF, pH value of the buffer solution, deposition potential, deposition time and the concentration of bismuth (Bi3+) were optimized for the stripping analysis of Pb2+. Under the optimum experimental condition, Nafion-WNCF modified bismuth film glassy carbon electrode (Nafion-WNCF/BFGCE) exhibits a wide linear range from 0.5 mu g L-1 to 100 mu g L-1 and a low detection limit of 0.2 mu g L-1 (S/N = 3) for detecting Pb2+. Especially, Nafion-WNCF/BFGCE was successfully applied to determine Pb2+ in tap water and lake water samples. All the results suggest that the WNCF can be considered as a green and low-cost nanomaterial for the precision detection of Pb2+ in real samples. (C) 2020 Elsevier B.V. All rights reserved.
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