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新型磁性纳米复合材料的制备及其对全氟化合物的吸附性能研究

发表时间:2016-06-15  浏览量:1870  下载量:572
全部作者: 周雨笋,陶芸,周廷廷,沈小丽,梅素容
作者单位: 华中科技大学同济医学院公共卫生学院;青岛大学附属医院检验科
摘 要: 首次将多氟单体和氨基单体结合,制备得到选择性识别全氟化合物(perfluorinated compounds,PFCs)的新型磁性纳米复合材料。首先采用改良的界面共沉淀法合成得到经—COOH修饰的Fe3O4纳米颗粒(nanoparticles,NPs)。Fe3O4 NPs近似球形,粒径介于(10 ± 5)nm,能在水中长期(> 2 周)稳定分散。而后以Fe3O4 NPs为基底,利用溶胶-凝胶技术,“一步法”制备得到由—NH2和全氟辛基修饰的磁性纳米复合材料(Fe3O4@SiO2-NH2&F13)。该磁性材料具有核壳结构,壳厚度在2 nm左右。傅里叶变换红外光谱(Fourier transform-infrared,FT-IR)图中1 560,1 194,1 145 cm-1处的吸收峰证实了材料表面—NH2和C—F键的存在。Fe3O4@SiO2-NH2&F13饱和磁化量为40.5 emu•g-1,可由外加磁场快速分离。该磁性材料基于静电作用、F-F相互作用和尺寸排阻效应对PFCs表现出高吸附容量和选择性识别能力。吸附动力学研究表明,Fe3O4@SiO2-NH2&F13可在短时间内(< 5 min)达到对PFCs的吸附平衡。该新型磁性纳米复合材料有望在PFCs痕量分析以及环境污染去除中表现出广阔的应用前景。
关 键 词: 卫生检验学;全氟化合物;磁性纳米复合材料;吸附性能;选择性识别
Title: Preparation of a novel magnetic nanocomposite and its adsorption property for perfluorinated compounds
Author: ZHOU Yusun, TAO Yun, ZHOU Tingting, SHEN Xiaoli, MEI Surong
Organization: School of Public Health, Tongji Medical College, Huazhong University of Science and Technology; Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University
Abstract: In this study, a novel magnetic nanocomposite for selective recognition of perfluorinated compounds (PFCs) was prepared initially based on fluorous and amino monomers. Firstly, according to a facile interfacial coprecipitation method with some modifications, Fe3O4 nanoparticles (NPs) coordinately coated by —COOH were synthesized. Fe3O4 NPs had a nearly spherical shape and a narrow size distribution [(10 ± 5) nm]. The hydrophilic particles could be kept stable for more than 2 weeks in water. Then, using Fe3O4 NPs as substrates, the magnetic nanocomposite (Fe3O4@SiO2-NH2&F13) functionalized with—NH2 and octyl-perfluorinated chain was prepared in one step by a sol-gel process. Fe3O4@SiO2-NH2&F13 has a core-shell structure with silica shell thickness of about 2 nm. In Fourier transform-infrared (FT-IR) spectra, characteristic absorption peaks of the —NH2 deformation vibration around 1 560 cm-1 and the C—F stretching vibration around 1 145 and 1 194 cm-1 demonstrated the presence of —NH2 and C—F bond on surface of Fe3O4@SiO2-NH2&F13. The magnetic nanocomposite has a saturation magnetization value of 40.5 emu•g-1, which makes it be isolated rapidly by an external magnetic field. Fe3O4@SiO2-NH2&F13 exhibited high adsorption capacity and good selectivity for PFCs by electrostatic and fluorine-fluorine interaction with the addition of size exclusion effect. In addition, the composite had a fast sorption rate for PFCs and the adsorption equilibrium could be achieved only in 5 min. Therefore, the proposed magnetic nanocomposite could be used as an effective adsorbent for PFCs trace analysis and their removal from aquatic environment.
Key words: sanitary inspection; perfluorinated compounds; magnetic nanocomposite; adsorption property; selective recognition
发表期数: 2016年6月第11期
引用格式: 周雨笋,陶芸,周廷廷,等. 新型磁性纳米复合材料的制备及其对全氟化合物的吸附性能研究[J]. 中国科技论文在线精品论文,2016,9(11):1155-1164.
 
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