Citation: Kun HUANG, Chengyu SUN, Dongqi WANG, Yuxin CHEN, Shuxia LIU. A stable and easily synthesized polyoxometalate-based Cu-MOF for trace detection of pollutants in water[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(8): 1593-1602. doi: 10.11862/CJIC.20260107 shu

A stable and easily synthesized polyoxometalate-based Cu-MOF for trace detection of pollutants in water

College of Chemistry, Northeast Normal University, Changchun 130024, China

Corresponding author: Shuxia LIU, liusx@nenu.edu.cn
Received Date: 2 April 2026
Revised Date: 10 July 2026

Figures(7)

A stable and easily synthesized polyoxometalate (POM)-based Cu-MOF hybrid (POM-Cu-MOF) was synthesized and prepared into a carbon paste electrode (CPE), denoted as POM-Cu-MOF-CPE. A conventional three-electrode system was adopted to investigate its electrochemical properties. The cyclic voltammetry curve of POM-Cu-MOF-CPE showed four pairs of reversible oxidation-reduction peaks corresponding to the single electron oxidation-reduction of Cu²⁺/Cu⁺ and the three-step double electron and double proton oxidation-reduction process of Mo⁶⁺ in molybdenum based POM. Compared with the electrochemical performance of pristine Keggin-type POM in aqueous solution, POM-Cu-MOF-CPE delivered an expanded electrochemical potential window. Electrocatalytic tests toward typical aquatic contaminants including IO₃^-, NO₂^-, and Cr₂O₇^2- verified that the cathodic peaks derived from the 4e^- to 6e^- reduction of Mo⁶⁺ in POM-Cu-MOF exhibited outstanding electrocatalytic activity for the reductive conversion of the above pollutants, achieving a detection limit satisfying the requirements for trace-level quantification. Moreover, POM-Cu-MOF-CPE maintained stable current responses in the presence of coexisting common interfering species, demonstrating prominent anti-interference capability.
- electrocatalysis,
- polyoxometalate-based MOFs,
- trace detection
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