纳米磁性复合材料的制备及其应用研究

发布时间：2018-03-20 00:10

  本文选题：Ag/Cu@Fe_3O_4　切入点：ZnFe_2O_4/rGO　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：纳米磁性复合材料是以纳米级磁性材料独特的磁学性能为基础、通过功能化修饰结合其它功能的复合材料,应用前景广阔,被广泛应用于军事工业、信息存储、生物医药和环境保护等领域。当前水环境因工业快速发展而遭受相当程度的破坏,纳米磁性复合材料在水处理中可以发挥重要作用:催化降解有机物和吸附染料,其一大特点就是依靠材料的超顺磁性而重复利用,提高利用率,降低成本。本文制备了Ag/Cu@Fe_3O_4、ZnFe_2O_4/rGO和CuFe_2O_4/rGO纳米磁性复合材料,分别用于对硝基苯酚的催化还原和亚甲基蓝的吸附。(1)本论文中利用L-赖氨酸修饰化学共沉淀法制备了能稳定分散的Fe_3O_4纳米粒子,使其表面带有氨基基团,并利用络合作用使氨基与Ag+、Cu2+络合,然后进行化学还原,得到Ag/Cu@Fe_3O_4纳米磁性复合粒子。采用傅里叶变换红外光谱(FTIR)、透射电子显微镜(TEM)、能量分散X射线仪(EDX)、X射线衍射仪(XRD)和振动样品磁强计(VSM)等对所制备的纳米粒子进行了形貌、结构及磁性能等表征。同时研究了Ag/Cu@Fe_3O_4纳米磁性复合粒子催化还原对硝基苯酚的性能,研究表明其为高效的催化剂并且可以在外磁场作用下回收利用。(2)水热法制备了ZnFe_2O_4/rGO纳米磁性复合材料,通过实验确定了T=180℃、t=6h、水和乙二醇的混合溶剂是制备兼具磁性优良和分散性较好的复合材料的最佳条件。另外ZnFe_2O_4/rGO复合磁性纳米粒子可以催化对硝基苯酚的还原,且可以多次重复利用,充分发挥其磁性可回收的作用。(3)以水热法制备了分散性好的CuFe_2O_4/rGO纳米磁性复合材料,并以傅里叶变换红外光谱(FTIR)、透射电子显微镜(TEM)、能量分散X射线仪(EDX)、X射线衍射仪(XRD)和振动样品磁强计(VSM)等表征了形貌、结构及磁性能等,在此基础上,也研究了其吸附亚甲基蓝染料的性能并讨论了不同反应条件对吸附性能的影响。
[Abstract]:Nanomagnetic composites are based on the unique magnetic properties of nanometer magnetic materials, which are functionally modified and combined with other functions. It has a broad application prospect, and has been widely used in military industry and information storage. At present, the water environment has suffered considerable damage due to the rapid development of industry. Nano-magnetic composites can play an important role in water treatment: catalytic degradation of organic matter and adsorption of dyes, One of its characteristics is that it can be reused by the superparamagnetism of the material, increase the utilization ratio and reduce the cost. In this paper, the Ag-P / CuFe3O / CuFe_2O_4/rGO nanocomposites have been prepared. In this thesis, Fe_3O_4 nanoparticles with stable dispersion were prepared by L- lysine modified chemical coprecipitation method, and the surface of the nanoparticles was composed of amino groups, which were used for the catalytic reduction of p-nitrophenol and the adsorption of methylene blue, respectively. The amino group is complexed with Ag ~ (2 +) Cu _ (2) by complexation, and then chemical reduction is carried out. Ag/Cu@Fe_3O_4 nanoparticles were prepared by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), energy dispersive X-ray diffraction (EDX) and vibrating sample magnetometer (VSM). The structure and magnetic properties of p-nitrophenol were characterized. The catalytic reduction of p-nitrophenol by Ag/Cu@Fe_3O_4 nanoparticles was also studied. The results show that ZnFe_2O_4/rGO nanomagnetic composites can be prepared by hydrothermal method with high efficiency and can be recycled under external magnetic field. The experimental results show that the mixed solvent of water and ethylene glycol at 180 鈩，

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