磁性金属有机框架材料对水中林可霉素的去除研究

目的 基于磁性金属有机框架材料(metal-organic framework, MOF)的磁固相萃取(magnetic solid phase extraction, MSPE)技术吸附去除环境水样中残留的林可霉素, 有效预防抗生素污染。方法 采用溶剂热法预制Fe3O4纳米颗粒, 然后与铜基金属离子和均苯三甲酸有机配体结合制备Fe3O4-MOF199复合材料。通过扫描电子显微镜(scanning electron microscopy, SEM)、X射线衍射(X-ray diffraction, XRD)、傅里叶红外光谱(Fourier transform infrared spectroscopy, FTIR)、差热热重分析曲线(thermogravimetric differential thermal analysis, TG-DTA)和N2吸附-解吸实验等表征手段对材料的形貌、晶体结构及理化性质进行分析。通过等温吸附平衡和吸附动力学实验评估该材料对林可霉素吸附性能, 并对吸附后洗脱剂进行优化。结果 所制备的Fe3O4-MOF199呈规则的正八面体形态, 并具有较高的比表面积(749.19 m2/g)和优越的热稳定性。吸附实验结果表明该吸附过程符合Freundlich吸附动力学方程和伪二阶动力学模型。Fe3O4-MOF199材料用于海河水和津河水中低浓度的林可霉素吸附, 去除率可达80%以上。结论 Fe3O4-MOF199材料具有良好的吸附性能和吸附效果, 结合MSPE工艺可以有效应用于抗生素残留的吸附, 所建立的方法具有简单、有效、准确的林可霉素吸附去除性能。

Removal of lincomycin from water by magnetic metal-organic framework materials

Objective A magnetic solid phase extraction (MSPE) technology based on magnetic metal-organic framework (MOF) material adsorbed lincomycin residues in environmental water samples, and effectively prevented antibiotic contamination. Methods Fe3O4 nanoparticles were prefabricated by solvothermal method, and then combined with copper based metal ions and organic ligands of Trimesic Acid to prepare Fe3O4-MOF199 composites. The morphology, crystal structure and physical and chemical properties of the materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric differential thermal analysis (TG-DTA) and N2 adsorption-desorption experiment. The adsorption performance of lincomycin was evaluated by isothermal adsorption equilibrium and adsorption kinetics experiments, and the eluent after adsorption was optimized. Results Fe3O4-MOF199 has regular octahedral morphology, high specific surface area (749.19m2/g) and excellent thermal stability. The material can be used to adsorb lincomycin at low concentration in hai river and Jin river, and the removal rate can reach more than 80%. Conclusion Fe3O4-MOF199 material has good adsorption performance and adsorption effect, combined with MSPE process can be effectively applied to the adsorption of antibiotic residues. The method has simple, effective and accurate adsorption removal performance of lincomycin.