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  本文關(guān)鍵詞： Fe_3O_4 腐殖酸 亞甲基藍 吸附 功能材料　出處：《陜西師范大學》2015年碩士論文　論文類型：學位論文

【摘要】：Fe3O4磁性納米微球具有很大的比表面積、良好的超順磁性、很好的磁響應性等特有功能。在生物傳感、靶向藥物、固定化酶生物、控制釋放、高密度信息儲存、磁共振成像、免疫測定、DNA和細胞分離、熱療等方面具有很好的應用前景。腐殖酸(H-A)是一種豐富的天然有機大分子。HA含有大量親水性官能團羧基、羥基、羰基等,因而HA對于親水性有機化合物具有很好的吸附性。本課題組在制備多功能復合材料的基礎上,成功合成了HA修飾的Fe3O4-HA功能性磁性納米復合材料。Fe3O4-HA功能性磁性納米復合材料克服了磁性微球抗腐蝕性差、易團聚、難于分離和洗滌等缺點。Fe3O4-HA功能性磁性納米復合材料是具有磁性能和配位性能雙功能的一種復合微球,它將Fe3O4磁性納米微球和腐殖酸的優(yōu)點完美結(jié)合起來。Fe3O4-HA功能性磁性納米復合材料在污染控制及稀土分離提純方面有廣闊的應用前景。本文的研究如下：1.Fe3O4磁性納米微球通過水熱合成法制備。Fe3O4磁性納米材料的結(jié)構(gòu)和性能用透射電子顯微鏡,光學接觸角測量儀,傅立葉變換紅外光譜,X射線衍射儀,振動樣品磁強計等進行表征。結(jié)果表明：Fe3O4磁性納米材料具有良好的單分散性且晶體結(jié)構(gòu)良好,呈規(guī)則的球形,其平均粒徑約為300nm,飽和磁化強度為77.0emu/g。Fe3O4磁性納米材料具有良好的超順磁性。2. Fe3O4-HA磁性納米復合材料通過改變pH值的方法制備。Fe3O4-HA磁性納米復合材料的結(jié)構(gòu)和性能用透射電子顯微鏡,光學接觸角測量儀,傅立葉變換紅外光譜,X射線衍射儀,振動樣品磁強計等進行表征。結(jié)果表明：Fe3O4-HA殼核納米微球具有良好的單分散性且晶體結(jié)構(gòu)良好,呈規(guī)則的球形,平均粒徑約為320nnm,包覆腐殖酸層的厚度約為10nnm,飽和磁化強度為75.3 emu/g。3.通過紫外可見分光光度計對含有有機染料亞甲基藍(MB)廢水的Fe3O4-HA磁性納米復合材料吸附行為進行研究。結(jié)果表明：Fe3O4-HA磁性納米復合材料吸附MB性能良好,最大吸附率為92%,具有高效性和可重復使用性。4.探究了Fe3O4-HA磁性納米復合材料對稀土銪離子、釹離子的吸附性能的影響,并考察了陰離子的加入對Fe3O4-HA功能性磁性納米復合材料吸附性能的影響。結(jié)果表明：Fe3O4-HA磁性納米復合材料吸附稀土離子性能良好,最大吸附率為96%,具有高效性和可重復使用性。PO43-的濃度為1.0mol/L時Fe3O4-HA磁性納米復合材料可以選擇性吸附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.
【學位授予單位】：陜西師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1;TB33

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本文編號：1463495