| Iron,one of the most widely distributed and common metallic element on earth,has been widely used among our production and life.The widely use of iron promotes the development of the productive forces of human society,human civilization and so on.Iron is the basis for industrial production.Because iron is easily oxidized in air,it is generally in the form of oxides in nature,such as iron oxide(Fe2O3)and iron oxide(Fe3O4).Therefore,the preparation and relative performance of new iron oxide based nanomaterials,mainly for ?-Fe2O3 and zinc ferrite,has been done a detailed study on this research.We characterized the products by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electronic microscope(TEM),BET surface area,Ultraviolet-visible spectroscopy(UV-VIS)and so on,and tested photocatalytic propertie of products we synthesised by degradating organic pollutants(RhB)in water under visible light and UV irradiation,respectively.?-Fe2O3 is a common form of iron oxide and the most stable form of iron oxide.?-Fe2O3,a kind of n-type semiconductor with a bandgap of approximately 2.1eV,has a lot of potential applications in the optical,magnetic,electrochemistry,and catalysis,due to its non-toxic,environmentally friendly,corrosion resistance and other characteristics.?-Fe2O3 has been widely used in inorganic pigments,catalysts,magnetic materials,electrode materials,gas sensors,and other biological materials.As we all know,the property and performance of nanomaterials depends not only on their chemical composition and crystal structure inherent,but also depends on the crystal morphology,size and growth direction.Therefore,controlled synthesis of uniform ?-Fe2O3 crystal has a very significant impact on improving all aspects of its performance.Zinc ferrite(ZnFe2O4)has the ferrite spinel structure.The structural formula of the spinel minerals is XY2O4,in which X is divalent cation and Y is a trivalent cation.Zinc ferrite spinel has a narrow band gap(1.9 eV).Due to its low toxicity,low cost,good performance and stability of the photosensitive photochemical properties,Zinc ferrite spinel has been widely used in lithium ion batteries,sensors,photochemical and photocatalytic hydrogen production from water etc.Thus,the study of zinc ferrite will have a very important impact on our life and production.The main contents of this article:(1)We synthesed ?-Fe2O3 nanomaterials by hydrothermal method.During the process,we added different amount of surfactant(sodium polystyrene sulfonate,Poly(styrene sulfonic acid)Sodium Salt,PSS)and studyed the effects of PSS concentration on ?-Fe2O3 nanomaterials morphology by X-ray diffraction,scanning electron microscopy characterization.Through the results,we found that when the amount of sodium polystyrene sulfonate increased from Og to 0.1g,the morphologies of the products changed from spindle with the diameter of 300 nm to small spindle with the diameter of 40 nm.We hypothesize that changes in ?-Fe2O3 nanomaterials morphology is due to the highly ionized polystyrene sulfonate sodium in water.Polystyrene sulfonate ion with a negative point can complex cations or be attracted on punctual nucleation surface,thus changing the ?-Fe2O3's growth habit.(2)We used novel reactants(iron acetylacetonate and zinc acetylacetonate)and facilitate easy test method(solvothermal)to synthetise zinc ferrite nanoparticles by one step.Zinc ferrite nanomaterials prepared by novel reactants and the the traditional heating method were both characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,BET surface area and UV-visible spectroscopy test.Compared with zinc ferrite nanomaterials prepared by traditional method,we found that zinc ferrite nanomaterials prepared by our method has more uniform morphology,larger surface area and more excellent photocatalytic properties.We can believe that the improved light catalytic ability is due to the enhanced surface area which can increase the number of active site and the surface area of light irradiation. |
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