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

A series of CoFeO materials derived from metal-organic framework were successfully constructed by the solvent-thermal method. The morphology of a typical sample CoFeO-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 CoFeO-1 material contained Co (Co/Co=0.98), and the redox reaction between Co and Fe produced more Fe (Fe/Fe=1.63), leading to the production of more O on the surface of the CoFeO-1 material (O%=0.34), thereby facilitating the efficient adsorption of the efficient adsorption of heavy metal ions (HMIs). CoFeO-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 CoFeO-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.