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Synthesis And Catalytic Properties Of Core-shell Magnetic Nanocomposites

Posted on:2012-04-23Degree:MasterType:Thesis
Country:ChinaCandidate:X M MiaoFull Text:PDF
GTID:2211330368496916Subject:Physical chemistry
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Many attempts have been made to explore Fe3O4 nanoparticles (NPs) withsuperparamagnetic as the starting material to construct nanocrystals with a core-shell structure,due to their multiple potential applications in magnetic resonance imaging (MRI), magneticrecording devices, magnetically guided drug delivery, thermal therapy and magneticseparation.Herein, a facile synthetic route to the preparation of Fe3O4@GNSs possessingmagnetization and tunable optical properties from visible to near-infrared (NIR) region atroom temperature.The resulting Fe3O4@GNSs described here show well catalytic activity forthe reduction of potassium ferricyanide as a model reaction. Importantly, the catalyst,Fe3O4@GNSs, can be easily recycled with an external magnet and exhibits long-life, goodreusability and stability. Additionally, in this thesis, the synthesis and property of Cu2O wereinvestigated.Cu2O nanocubes with equirotal grains,equirotal grains,stable characterization andFe3O4 cores have been successfullu fabricated by solution-phase reducing and a seededgrowth method .The Fe3O4@Cu2O Nanocubes was used to research on the photocatalysisperformance,and will degrade the object to decide the organic dyestuffas methyl blue as theindicator.The Fe3O4@Cu2O Nanocubes made by ourselves will play an import role in thedegeneration of methyl blue under visible light.Importantly, the catalyst, Fe3O4@Cu2ONanocubes, can be easily recycled with an external magnet, and long-life and good reusabilityusing an external magnetic field are demonstrated.The characterization method used here aretransmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-Visspectrophotometer, and etc.
Keywords/Search Tags:Fe3O4@GNSs, core-shell structure, Fe3O4@Cu2O Nanocubes, catalyst, reusability
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