Fe3O4@COF磁性共价有机框架材料的制备及吸附多溴联苯醚性能研究

Study on the preparation of Fe3O4@COF magnetic covalent organic framework and adsorption properties for polybrominated diphenyl ethers

中文关键词:  磁性共价有机框架  多溴二苯醚  吸附性能

英文关键词:magnetic covalent organic frameworks  polybrominated diphenyl ethers  adsorption performance

中文摘要:

      目的 室温下合成核壳结构磁性共价有机骨架(covalent organic framework, COF)材料, 结合磁性固相萃取技术用于水中多溴二苯醚的吸附。方法 2,5-二乙烯基对苯二甲醛和均三(4-氨基苯基)苯在室温下实现对Fe3O4的包裹而合成新的磁性吸附剂, 通过透射电子显微镜、扫描电子显微镜、傅里叶变换红外光谱、X射线衍射和振动样品磁强计对制备的材料进行了表征, 通过吸附容量、吸附动力学和吸附热力学实验对吸附性能进行了分析并推测了可能的吸附机制。结果 合成的Fe3O4@COF磁性纳米材料具有良好的结晶度, 磁强度和以Fe3O4为核心22 nm左右轻质COF薄膜为外壳的经典核壳结构。合成的磁性吸附剂在吸附多溴二苯醚上具有良好的动力学性能, 吸附量可达3.287 mg/g。结论 温和条件下合成的具有良好结晶度的Fe3O4@COF磁性纳米材料作为一种优异的吸附剂, 凭借其特定的结构、特殊的基团实现了对多溴联苯醚类持久性有机污染物的高效吸附, 另外结合磁固相萃取技术可以实现快速分离, 为下一步商业化应用提供了很好的理论基础。

英文摘要:

      Objective To synthesize magnetic covalent organic framework (COF) materials with core-shell structure at room temperature, and combine them with magnetic solid-phase extraction technology for the adsorption of polybrominated diphenyl ethers in water. Methods A new magnetic adsorbent was synthesized by wrapping Fe3O4 with 2,5-divinylp-benzaldehyde and mesitylene (4-aminophenyl) benzene at room temperature. The materials were characterized by transmission electron microscope, scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction and vibrating sample magnetometer. The adsorption performance was analyzed by adsorption capacity, adsorption kinetics and adsorption thermodynamic experiments, and the possible adsorption mechanism was speculated. Results The synthetic Fe3O4@COF magnetic nanomaterials had good crystallinity, magnetic strength and classic core-shell structure with Fe3O4 as the core and about 22 nm light COF film as the shell. It had good performance in adsorbing polybrominated diphenyl ethers, and the adsorption capacity could reach 3.287 mg/g. Conclusion Fe3O4@COF magnetic nanomaterial is an excellent adsorbent with good crystallinity, which can be synthesized under mild conditions and used for the adsorption of polybrominated diphenyl ethers. With its specific structure and special groups, it can achieve high-efficiency adsorption of polybrominated diphenyl ether persistent organic pollutants. In addition, combined with magnetic solid-phase extraction technology, it can realize rapid separation, which provides a good theoretical basis for the next commercial application.