A portable magnetic electrochemical sensor for highly efficient Pb(II) detection based on bimetal composites from Fe-on-Co-MOF

Yijiao Zhang; Siwei Jin; Renlong Liu; Zuohua Liu; Li Gong; Li Zhang; Tengda Zhao; Wei Yin; Shiqi Chen; Huanbao Fa; Lidan Niu

doi:10.1016/j.envres.2024.118499

A portable magnetic electrochemical sensor for highly efficient Pb(II) detection based on bimetal composites from Fe-on-Co-MOF

Environ Res. 2024 Feb 16:250:118499. doi: 10.1016/j.envres.2024.118499. Online ahead of print.

Authors

Yijiao Zhang¹, Siwei Jin¹, Renlong Liu², Zuohua Liu², Li Gong¹, Li Zhang¹, Tengda Zhao¹, Wei Yin³, Shiqi Chen⁴, Huanbao Fa⁵, Lidan Niu⁶

Affiliations

¹ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China.
² School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; National-Municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, Chongqing University, Chongqing, 400044, China.
³ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; National-Municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, Chongqing University, Chongqing, 400044, China; Analytical and Testing Center of Chongqing University, Chongqing, 400044, China.
⁴ Key Laboratory of Condiment Supervision Technology for State Market Regulation, China; Chongqing Institute for Food and Drug Control, China.
⁵ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China; National-Municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, Chongqing University, Chongqing, 400044, China. Electronic address: huanbaofa@cqu.edu.cn.
⁶ Key Laboratory of Condiment Supervision Technology for State Market Regulation, China; Chongqing Institute for Food and Drug Control, China. Electronic address: niulidan@cqifdc.org.cn.

PMID: 38368921
DOI: 10.1016/j.envres.2024.118499

Abstract

The practical, sensitive, and real-time detection of heavy metal ions is an essential and difficult problem. This study presents the design of a unique magnetic electrochemical detection system that can achieve real-time field detection. To enhance the electrochemical performance of the sensor, Fe₂O₃@C-800, Co/CoO@/C-600, and CoFe₂O₄@C-600 magnetic composites were synthesized using three MOFs precursors by the solvothermal method. And the morphology structure and electrochemical properties of as-prepared magnetic composites were researched by X-ray diffraction (XRD), Scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), specific surface area and porosity analyzer (BET) and differential pulse voltammetry (DPV). The results shown that these composites improve conductivity and stability while preserving the MOFs basic frame structure. Compared with the monometallic MOFs-derived composites, the synergistic effect of the bimetallic composite CoFe₂O₄@C-600 can significantly enhance the electrochemical performance of the sensor. The linear range for the detection of lead ions was 0.001-60 μM, and the detection limit was 0.0043 μM with a sensitivity of 22.22 μA μM·cm^-2 by differential pulse voltammetry. The sensor has good selectivity, stability, reproducibility and can be used for actual sample testing.

Keywords: Detection of lead; Electrochemical analysis; MOFs-derived materials; Magnetic nanomaterials.