Sonochemical Method Preparation And Applicative Exploration Of FeO?OH,Cl?and Mn₃O₄ Nanomaterials

Nanomaterials have outstanding performances in mechanics,electricity,magnetics and catalytic activity etc.It has opened up brand-new research and application field for new material development.As nanoparticals,FeO?OH,Cl?and Mn₃O₄ have good application prospects in energy conversion/storage and environmental protection etc.However,for FeO?OH,Cl?and Mn₃O₄ nanomaterials,the commonly preparation methods are not only time-consuming but also need high-level equipment,such as hydrothermal method etc.Therefore,it is of great significance to find green late-model preparation methods.In this paper,FeO?OH,Cl?and Mn₃O₄ nanoparticals and their assemblies are prepared by sonochemical method using Spore or Fe₃O₄ as templates,FeCl₃ and Mn?OAc?₂ as precursors,respectively.And their applications are preliminarily explored.The influence of ultrasonic time and precursor solution concentration on the morphology and structure of FeO?OH,Cl?and Mn₃O₄ nanoparticles and their assemblies were investigated.Their morphology and structure are studied by X-ray diffraction?XRD?,field emission scanning electron microscopy?FESEM?and transmission electron microscopy?TEM?.The results shows that the optimal ultrasonic time and FeCl₃concentration for preparing FeO?OH,Cl?nanoparticles by sonochemical method are 2 h and 0.2 mol/L,respectively.The optimal ultrasonic time for preparing FeO?OH,Cl?nano-assembles by sonochemical method is also 2 h after adding templates in 0.2 mol/L FeCl₃precursor solution.Comparatively speaking,the optimal ultrasonic time and Mn?OAc?₂concentration for preparing Mn₃O₄ nanoparticles by sonochemical method are also 2 h and0.2 mol/L,respectively.But the optimal ultrasonic time for preparing Mn₃O₄ nano-assembles by sonochemical method is 3 h after adding templates in 0.2 mol/L Mn?OAc?₂precursor solution.FeO?OH,Cl?nanoparticles prepared by sonochemical method have a high specific surface area of 94.26 cm²/g,which is expected to be a good adsorbent.Therefore,the adsorption properties of FeO?OH,Cl?nanoparticles for organic dyes are preliminarily explored.The 150 mg FeO?OH,Cl?nanoparticles adsorp methylene blue standard solution of 10 mL 0.05 mg/mL.after 1 h of adsorption,the adsorption rate reached more than 60%,and after 10 h adsorption,the adsorption rate is as high as 90%.The results show that FeO?OH,Cl?nanoparticles have excellent adsorption properties.Fe₃O₄@Mn₃O₄ nanoassmblies are modified into Fe₃O₄@Mn₃O₄ double-sided structures by ion-sputtering gold nanoparticles.In the double-sided structure of Fe₃O₄@Mn₃O₄,half of the surface is gold particles and the other half is Mn₃O₄nanoparticles.The bare Mn₃O₄ half surface can catalyze the decomposition of H₂O₂ to O₂,and the opposite reaction produced by the directional diffusion of O₂ can promote the movement of Fe₃O₄@Mn₃O₄ double-sided structures in the H₂O₂ solution.On this basis,the controllable motion of the Fe₃O₄@Mn₃O₄ double-sided structures can be realized in the H₂O₂ solution through the guidance of an external magnetic field.Therefore,Fe₃O₄@Mn₃O₄ double-sided structures are expected to be a controllable Mn₃O₄ type Fenton agent in the treatment of environmental sewage.