MOF Derived Cobalt Ferrite Cubic Rod‐Like Materials for Highly Efficient Electrochemical Simultaneous Detection of Multiple Heavy Metal Ions

A series of CoFe₂O₄ materials derived from metal-organic framework were successfully constructed by the solvent-thermal method. The morphology of a typical sample CoFe₂O₄-1 was mostly in the form of a cubic rod-like structure with a size distribution of 3.2±0.2 μm, while a small amount of the structure presented hexagonal shape with uniform size dispersion. The XPS characterization results confirmed that the CoFe₂O₄-1 material contained Co³⁺ (Co²⁺/Co³⁺=0.98), and the redox reaction between Co²⁺ and Fe³⁺ produced more Fe²⁺ (Fe²⁺/Fe³⁺=1.63), leading to the production of more O_V on the surface of the CoFe₂O₄-1 material (O_V%=0.34), thereby facilitating the efficient adsorption of the efficient adsorption of heavy metal ions (HMIs). CoFe₂O₄-1/GCE as a typical electrode presented excellent performance for the detection of multiple HMIs. The results should be attributed to the good electrical conductivity and large electrochemically active surface area of CoFe₂O₄-1/GCE, accelerating the transport of ions and charges in the system. Interestingly, there are interaction mechanisms between the HMIs when performing simultaneous detection, suggesting the detection of target ions can be facilitated by adding additional ions. This study provides new research insights for the development of highly sensitive electrochemical sensors for real-time environmental monitoring.