Electrochemical sensor based on Bi/Bi2O3 doped porous carbon composite derived from Bi-MOFs for Pb2+ sensitive detection

Chengjian Wang; Qijian Niu; Dong Liu; Xiuxiu Dong; Tianyan You

doi:10.1016/j.talanta.2023.124281

Electrochemical sensor based on Bi/Bi₂O₃ doped porous carbon composite derived from Bi-MOFs for Pb²⁺ sensitive detection

Talanta. 2023 Jun 1:258:124281. doi: 10.1016/j.talanta.2023.124281. Epub 2023 Jan 21.

Authors

Chengjian Wang¹, Qijian Niu², Dong Liu¹, Xiuxiu Dong¹, Tianyan You³

Affiliations

¹ Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.
² Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China. Electronic address: niuqijian@ujs.edu.cn.
³ Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China. Electronic address: youty@ujs.edu.cn.

PMID: 36940577
DOI: 10.1016/j.talanta.2023.124281

Abstract

It is of great significance to develop electrochemical sensors based on novel functional nanomaterials for heavy metal ions detection. In this work, a novel Bi/Bi₂O₃ co-doped porous carbon composite (Bi/Bi₂O₃@C) was prepared by simple carbonization of bismuth-based metal-organic frameworks (Bi-MOFs). The micromorphology, internal structure, crystal and elemental composition, specific surface area and porous structure of the composite were characterized by SEM, TEM, XRD, XPS, and BET. Further, a sensitive electrochemical sensor for Pb²⁺ detection was constructed by modifying Bi/Bi₂O₃@C on the surface of the glassy carbon electrode (GCE) based on the square wave anodic stripping voltammetric (SWASV). The different factors affecting the analytical performance were optimized systematically, such as material modification concentration, deposition time, deposition potential, and pH value. Under optimized conditions, the proposed sensor exhibited a wide linear range from 37.5 nM to 2.0 μM with a low detection limit of 6.3 nM. Meanwhile, the proposed sensor showed good stability, acceptable reproducibility, and satisfactory selectivity. The reliability of the as-proposed sensor was confirmed by the ICP-MS method for Pb²⁺ detection in different samples.

Keywords: Bi/Bi(2)O(3)@C; Electrochemical sensor; Pb(2+) detection; Stripping voltammetry.