MOFs-based Fe@YAU-101/GCE electrochemical sensor platform for highly selective detecting trace multiplex heavy metal ions

Qian Liang; Wang Xiao; Cheng Zhang; Ding Zhu; Si-Lu Wang; Si-Yu Tian; Tang Long; Er-Lin Yue; Ji-Jiang Wang; Xiang-Yang Hou

doi:10.1016/j.talanta.2023.124491

MOFs-based Fe@YAU-101/GCE electrochemical sensor platform for highly selective detecting trace multiplex heavy metal ions

Talanta. 2023 Jul 1:259:124491. doi: 10.1016/j.talanta.2023.124491. Epub 2023 Apr 2.

Authors

Affiliations

¹ Department of Chemistry and Chemical Engineering, Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, Key Laboratory of Analytical Technology and Detection, Yan'an University, Shaanxi, 716000, China.
² Department of Chemistry and Chemical Engineering, Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, Key Laboratory of Analytical Technology and Detection, Yan'an University, Shaanxi, 716000, China. Electronic address: wx2248@126.com.

PMID: 37023672
DOI: 10.1016/j.talanta.2023.124491

Abstract

The construction of sensors with specific recognition functions can easily, sensitively and efficiently detect heavy metal ions, which is a demand in the field of electrochemical sensing and an important topic in the detection of environmental pollutants. An electrochemical sensor based on MOFs composites was developed for sensing of multiplex metal ions. The large surface area, adjustable porosities and channels in MOFs facilitate successful loading of sufficient quantities highly active units. The active units and pore structures of MOFs are regulated and synergetic with each other to enhance the electrochemical activity of MOFs composites. Thus, the selectivity, sensitivity and reproducibility of MOFs composites have been improved. Fortunately, after characterization, Fe@YAU-101/GCE sensor with strong signal was successfully constructed. In the presence of target metal ions in solution, the Fe@YAU-101/GCE can efficiently and synchronously identify Hg²⁺, Pb²⁺, and Cd²⁺. The detection limits (LOD) are 6.67 × 10^-10 M(Cd²⁺), 3.33 × 10^-10 M(Pb²⁺) and 1.33 × 10^-8 M (Hg²⁺), and are superior to the permissible limits set by the National Environmental Protection Agency. The electrochemical sensor is simple without sophisticated instrumentation and testing processes, hence promising for practical applications.

Keywords: Electrochemical sensor; MOFs composites; Multiplex heavy metal ions.