| Nano-materials are known as the most promising materials in the21st century, caused widespread concern because of its special nature. Nanomaterials is at least one dimension in the l00nm scale or materials as the basic unit in the three-dimensional space[1]. a-Fe2O3is an important inorganic compounds, And it is an n-type semiconductor material, the structure of the corundum structure, band gap width of the narrow (2.2eV) is widely used as magnetic recording of soft magnetic materials, Ferrite material polishing agents [2],is an important inorganic chemical raw materials, with special optical. magnetic, electrical properties, has been widely applied in many fields. Nanoscale α-Fe2O3composites due to their unique optical, electrical and magnetic properties make them good in the field of semiconductor materials, lithium-ion batteries, magnetic storage devices, gas sensors, catalytic organic reactions application prospects, has caused particular concern.Nanoparticles is an excellent catalyst, which is due to the nanoparticles have a relatively small size, large surface area, solid surface atoms and the internal atomic environment in which different, there are many unsaturated bonds, leading to the nanoparticle surface there are manydefects, so that the solid surface of the great chemical activity, are particularly vulnerable and the other surrounding atoms play a role to stabilize, it has the basic conditions as a catalyst, which showed great catalytic activity. So we started to study the application of ferric oxide and iron oxide in the organic catalytic reaction. Relative to the previous preparation of technology, the method is simple, controllable conditions, safety, environmental friendliness, green chemistry development of new research ideas.The main content of this thesis include the following three parts:(1)Peanutlike Iron oxide nanoparticles were prepared by hydrothermal method using ferric chloride, and sodium carbonate as raw materials. And Ascorbic acid were used as a reducer. The results show that good Peanutlike Iron oxide nanoparticles can be synthesized using Ascorbic acid as reducer at180℃for16h. The effects were studied that the experimental conditions affected the crystallization and morphology of the products including the amount of Ascorbic acid, Glycerin and the reaction temperature.The results reveal that reaction temperature has a little impact on the morphology of the product, but it has an impact on the size and the uniformity of particle size of the products. Changing the amount of Ascorbic acid has an impact on the morphology of the product; And the amount of Glycerin has a greater impact on the dispersion of the products.(2)Ferroferric oxide microcrystals with controlled morphology was synthesized by a hydrothermal method using Iron vitriol and Potassium hydroxide as raw materials. And Propylene glycol was used as solvent. The results show that good Cure Ferroferric oxide nanoparticles can be synthesized using Propylene glycol as solvent at200℃for24h. The effects were studied that the experimental conditions affected the crystallization and morphology of the products including the amount of Potassium hydroxide, Propylene glycol and the reaction temperature. Different concentrations of Potassium hydroxide and Propylene glycolare the key factor in the formation of morphology of Fe3O4crystals.(3) This chapter ligand participation of a-Fe2O3as the catalyst, sodium ethoxide as a base of NMF as solvent, reaction24h at135℃can complete the C-S coupling reaction and higher yield. Experiment by changing the reaction conditions, you can get a different yield. Further evidence of the amount of catalyst, ligand, alkalis, solvents, reaction time, reaction temperature have a certain impact on the yield of products. The results showed that nano-iron oxide catalyst, help to improve the yield of the reaction. |
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