Preparation And Application Research Of Iron-cerium Composite Oxide Nanomaterials

Transition metal oxides have excellent catalytic activity and electrochemical stability due to their unique physicochemical properties and surface properties,and are often used in the fields of catalytic degradation and the construction of electrochemical sensors.However,the single transition metal oxide material has limited its practical application in various fields due to its own defects and the fact that it is easy to compound electron hole pairs.Compared with single metal oxide,mixed polymetallic oxide materials have more significant advantages,among which perovskite oxide is the most widely studied material.The general formula for perovskite-type oxides is often ABO₃,where A usually represents an alkali or rare earth element and B represents transition metal element.In this paper,CeFeO₃ and CeFe₂O₅ nanocomposites with different cerium and iron ratios were prepared by sol-gel method.The structure and morphology of the composites were analyzed by XRD,XPS,SEM,ICP-MS and other characterization techniques.Moreover,CeFeO₃ and CeFe₂O₅ nanocomposites with different cerium-iron ratios were used for Fenton-like catalytic degradation and electrochemical detection,respectively,to explore the catalytic and electrochemical properties of the two materials.The main results of this paper are as follows:1.Through comparative experimental analysis,the catalytic performance of CeFeO₃nanocomposite is stronger than that of CeFe₂O₅ nanocomposite.Under the optimal reaction conditions,the degradation rate and TOC removal rate of simulated tetracycline hydrochloride wastewater?1 mmol/L?were 91.1%and 58.5%,respectively,with CeFeO₃nanocomposite as catalyst.Moreover,this kind of Fenton reaction system has a wide range of p H applications,and has a good degradation rate in the range of p H 3.0-7.0.2.Through comparative experimental analysis,the electrochemical performance of CeFe₂O₅ nanocomposite is stronger than that of CeFeO₃ nanocomposite.The new electrochemical sensor detection Cd?II?constructed with CeFe₂O₅ as the electrode modification material can obtain the sensitivity and the minimum detection limit as 31.68mA/mM,0.94 n M,respectively.Moreover,the new sensor showed good stability to Cd?II??RSD 3.34%?and analysis accuracy?1±2.7%?.In the interference experiment of single ion and multi-ion,it also shows good anti-interference ability.Therefore,CeFe₂O₅/GCE can be used to detect trace amounts of heavy metal ions in environmental samples and provide new materials for sensor research.