功能性磁性纳米复合材料制备及应用

发布时间：2018-01-25 19:11

本文关键词： Fe_3O_4 腐殖酸亚甲基蓝吸附功能材料　出处：《陕西师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：Fe3O4磁性纳米微球具有很大的比表面积、良好的超顺磁性、很好的磁响应性等特有功能。在生物传感、靶向药物、固定化酶生物、控制释放、高密度信息储存、磁共振成像、免疫测定、DNA和细胞分离、热疗等方面具有很好的应用前景。腐殖酸(H-A)是一种丰富的天然有机大分子。HA含有大量亲水性官能团羧基、羟基、羰基等,因而HA对于亲水性有机化合物具有很好的吸附性。本课题组在制备多功能复合材料的基础上,成功合成了HA修饰的Fe3O4-HA功能性磁性纳米复合材料。Fe3O4-HA功能性磁性纳米复合材料克服了磁性微球抗腐蚀性差、易团聚、难于分离和洗涤等缺点。Fe3O4-HA功能性磁性纳米复合材料是具有磁性能和配位性能双功能的一种复合微球,它将Fe3O4磁性纳米微球和腐殖酸的优点完美结合起来。Fe3O4-HA功能性磁性纳米复合材料在污染控制及稀土分离提纯方面有广阔的应用前景。本文的研究如下：1.Fe3O4磁性纳米微球通过水热合成法制备。Fe3O4磁性纳米材料的结构和性能用透射电子显微镜,光学接触角测量仪,傅立叶变换红外光谱,X射线衍射仪,振动样品磁强计等进行表征。结果表明：Fe3O4磁性纳米材料具有良好的单分散性且晶体结构良好,呈规则的球形,其平均粒径约为300nm,饱和磁化强度为77.0emu/g。Fe3O4磁性纳米材料具有良好的超顺磁性。2. Fe3O4-HA磁性纳米复合材料通过改变pH值的方法制备。Fe3O4-HA磁性纳米复合材料的结构和性能用透射电子显微镜,光学接触角测量仪,傅立叶变换红外光谱,X射线衍射仪,振动样品磁强计等进行表征。结果表明：Fe3O4-HA壳核纳米微球具有良好的单分散性且晶体结构良好,呈规则的球形,平均粒径约为320nnm,包覆腐殖酸层的厚度约为10nnm,饱和磁化强度为75.3 emu/g。3.通过紫外可见分光光度计对含有有机染料亚甲基蓝(MB)废水的Fe3O4-HA磁性纳米复合材料吸附行为进行研究。结果表明：Fe3O4-HA磁性纳米复合材料吸附MB性能良好,最大吸附率为92%,具有高效性和可重复使用性。4.探究了Fe3O4-HA磁性纳米复合材料对稀土铕离子、钕离子的吸附性能的影响,并考察了阴离子的加入对Fe3O4-HA功能性磁性纳米复合材料吸附性能的影响。结果表明：Fe3O4-HA磁性纳米复合材料吸附稀土离子性能良好,最大吸附率为96%,具有高效性和可重复使用性。PO43-的浓度为1.0mol/L时Fe3O4-HA磁性纳米复合材料可以选择性吸附Nd3+。
[Abstract]:Fe3O4 magnetic nanospheres have a large specific surface area, good superparamagnetism, good magnetic response and other unique functions in biosensor, targeted drugs, immobilized enzyme biology, control release. High-density information storage, magnetic resonance imaging, immunoassay of DNA and cell separation. Humic acid H-A is a rich natural organic macromolecule. Ha contains a large number of hydrophilic functional groups carboxyl hydroxyl carbonyl and so on. Therefore, HA has a good adsorption on hydrophilic organic compounds. HA-modified Fe3O4-HA functional magnetic nanocomposites. Fe3O4-HA functional magnetic nanocomposites were successfully synthesized to overcome the poor corrosion resistance and agglomeration of magnetic microspheres. Fe3O4-HA functional magnetic nanocomposites are a kind of composite microspheres with both magnetic and coordination properties. It combines the advantages of Fe3O4 magnetic nanospheres and humic acid perfectly. Fe3O4-HA functional magnetic nanocomposites have broad application prospects in pollution control and rare earth separation and purification. The study is as follows:. 1. The structure and properties of Fe _ 3O _ 4 magnetic nanomaterials were prepared by hydrothermal synthesis. Optical contact angle measuring instrument, Fourier transform infrared spectroscopy and X-ray diffractometer. The results show that: Fe _ 3O _ 4 magnetic nanomaterials have good monodispersity, good crystal structure and regular spherical shape, and the average particle size is about 300 nm. The saturation magnetization is 77.0 emu / g. Fe3O4 magnetic nanomaterials with good superparamagnetism. The structure and properties of Fe _ 3O _ 4-HA magnetic nanocomposites were prepared by changing pH value of Fe3O4-HA magnetic nanocomposites. Optical contact angle measuring instrument, Fourier transform infrared spectroscopy and X-ray diffractometer. The results show that: Fe _ 3O _ 4-HA nanoparticles have good monodispersity, good crystal structure, regular spherical shape, and average particle size is about 320nnm. The thickness of the coated humic acid layer is about 10nnm. The saturation magnetization is 75.3 emu / g. 3. The methylene blue (MBB) containing organic dyestuff is determined by UV-Vis spectrophotometer. The adsorption behavior of Fe3O4-HA magnetic nanocomposites in wastewater was studied. The results showed that the adsorption of MB by the magnetic nanocomposites of Fe _ 3O _ 4-HA was good. The maximum adsorption rate is 92 and has high efficiency and repeatability. 4. The influence of Fe3O4-HA magnetic nanocomposites on the adsorption properties of rare earth europium and neodymium ions was investigated. The effect of the addition of anions on the adsorption properties of Fe3O4-HA functional magnetic nanocomposites was investigated. The results showed that the adsorption properties of rare earth ions in the Fe3O4-HA functional magnetic nanocomposites were good. Nd3 can be selectively adsorbed by Fe3O4-HA magnetic nanocomposites at the concentration of 1.0 mol / L with high efficiency and repeatability.
【学位授予单位】：陕西师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TB33

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