Preparation Of Fe₃O₄@Prussion Blue-Based Nanocomposites And Their Applications In Photo-fenton Reaction

Recently,Fe₃O₄ has attracted considerable interests for disposal of organic pollutants by taking advantages of superparamagnetic property,catalytic property,biocompatibility and low toxicity.Owing to the strong anisotropic dipolar interactions,the aggregation of Fe₃O₄ nanoparticles was unavoidable,leading to poor dispersibility and catalytic activity.Therefore,it was necessary to establish a suitable preparation method for Fe₃O₄-based nanocomposites with high catalytic performance.Prussian blue?PB?as one kind of classical cyanometallate-based coordination polymers,was a composite with“Fe”.In this paper,a reactive-template method for preparation of Fe₃O₄@PB-based nanocomposites was introduced,which not only increases the surface area of Fe₃O₄nanoparticles,but also improves the dispersibility;Therefore,the catalytic activity of the catalyst was effectively improved.The main research in this manuscript included the following two parts:Fe₃O₄@Prussian Blue?Fe₃O₄@PB?nanocomposites were synthesized in one-step,and RhB degradation was selected as a model reaction to evaluate their catalytic performance.The nanocomposites obtained at an etching time of 60 min exhibited the highest degradation rate?much better than that of pure Fe₃O₄ and pure PB?.Under the identical H₂O₂ dosage,RhB degradation rate was accelerated following solution pH value lowering,temperature rising,initial RhB concentration decreasing.In addition,the magnetic Fe₃O₄@PB nanocomposites could be separated from the reaction system in the presence of a magnet.After repeating the photo-Fenton reaction for five times,the catalysts still showed superior catalytic activity.Fe₃O₄@Prussian Blue@polypyrrole?Fe₃O₄@PB@PPy?nanocomposites were synthesized in one-step and the corresponding products exhibited a hydrogel-like structure.Tetracycline?TC?was chosen as the target pollutants for evaluating photo-Fenton catalytic performance.Compared with pure Fe₃O₄ and Fe₃O₄@PPy nanocomposites,Fe₃O₄@PB@PPy shows the best catalytic activity.Under the identical H₂O₂ dosage,TC degradation rate was accelerated following initial TC concentration decreasing.In addition,the magnetic Fe₃O₄@PB@PPy nanocomposites could be separated from the reaction system using external magnetic field.They displayed good reusability in cycle catalytic test.