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Synthesis, Property and Application of Hierarchical Structured Fe3O4Micro-and Nanomaterials

Author: ShenLing
Tutor: WangZhengHua
School: Anhui Normal University
Course: Inorganic Chemistry
Keywords: Fe3O4 Hierarchical structure Solvothermal method Magnetic materials
CLC: O614.811
Type: Master's thesis
Year: 2013
Downloads: 73
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Abstract


In recent years, magnetic nanomaterials have aroused much interestdue to their unique properties. Especially, hierarchical structuredmagnetic nanomaterials have been essentially researched owing to theirexistence of large activated surface areas. The development andapplication of Fe3O4magnetic nanomaterials with hierarchical structuresis of great significance. In this dissertation, we mainly studied thesynthesis of hierarchical structured Fe3O4nanomaterials and theircomposites, and the transformation of hierarchical structured Fe3O4frompolycrystalline to single crystal under heating. The as-synthesizedmagnetic nanomaterials were characterized, and their applications werealso studied such as heavy metal ions adsorption and electrochemicalenergy storage. The main results are summarized as follows:1. Monodispersed hierarchical Fe3O4microspheres were preparedthrough a solvothermal method. The Fe3O4microspheres exhibitferromagnetic properties at room temperature and can be convenientlycollected via an external magnet. Different from bulk Fe3O4, thesehierarchical Fe3O4microspheres can be applied to remove Pb2+ions fromwaste water. Furthermore, the interaction between Fe3O4and toxic metalions is reversible, which means that the adsorbed Pb2+ions can beremoved from Fe3O4in weak acidic water with the assistance ofultrasound radiation. It is noteworthy that the adsorption ability of theFe3O4microspheres is so strong that any further modification of theFe3O4microspheres is unnecessary.2. The hierarchical Fe3O4microspheres that synthesized via asolvothermal method was applied as raw material, and Fe3O4@Cnanocomposites were prepared through the hydrothermal carborization ofglucose on the surfaces Fe3O4microspheres. The Fe3O4@Cnanocomposites were characterized by X-ray diffraction （XRD）, fieldemission scanning electron microscopy （FESEM）, and transmissionelectron microscopy （TEM）. The electrochemical energy storage performances of the Fe3O4@C microspheres were investigated by Cyclicvoltammetry （CV）、Galvanostatic charge–discharge （CD） and Cyclic life.The results show that the Fe3O4@C microspheres possess a specificcapacitance of110.8F g1at a current density of0.5A g1with a potentialwindow of between1.0and0.5V, which shows good electrochemicalenergy storage performances. After2000electrochemical cycles, theFe3O4@C electrode still remaining95.6%of the highest specificcapacitance, indicating its good cycle stability.3. Monodispersed hierarchical Fe3O4microspheres were preparedthrough a simple solvothermal method. After dried, they were put into atube-furnace and then calcined under the protection of argon flow. Theinfluence of calcining temperature and time on the morphology of thefinal product was studied. The products were studied by X-ray diffraction（XRD）, field emission scanning electron microscopy （FESEM）,transmission electron microscopy （TEM）, and vibrating samplemagnetometer （VSM）. The results show that single crystal Fe3O4can beobtain under a calcining temperature （500℃） that is far below the meltingpoint of bulk Fe3O4for2h. The magnetic property of product wastransformed from superparamagnetism into ferromagnetism.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > First Ⅷ group metal elements and their compounds > Iron metal element > Iron Fe
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