摘要
采用共沉淀法制备磁性Fe3O4纳米粒子,然后在乳化体系中,以戊二醛为交联剂,通过席夫碱反应制备了改性磁性壳聚糖微球(Fe3O4@CS)以及聚乙烯亚胺(PEI)改性磁性壳聚糖微球(Fe3O4@CS/PEI)。采用红外光谱、X射线粉末衍射、磁滞回线测定、扫描电子显微镜和动态光散射对微球的结构、粒径以及磁性进行了表征,通过紫外-可见分光光度计研究了微球对布洛芬的吸附能力和重复利用率。结果表明,在微球制备过程中发生的席夫碱反应不会对纳米Fe3O4的晶型产生影响。微球均呈现出规整的球形,分布较窄,且具有一定的磁响应性,对布洛芬的吸附模型符合Langmuir吸附等温模型和二级动力学模型。随着PEI用量的增加,微球对布洛芬的吸附能力增强,经Langmuir吸附方程拟合的最大吸附量为138.63 mg/g。同时,微球具有良好的重复使用效率,重复5次后仍能达到初始吸附量的90%以上。
Magnetic Fe3O4 nano-particles were prepared by chemical coprecipitation method, and magnetic chitosan microspheres(Fe3O4@CS) and polyethyleneimine(PEI) modified magnetic chitosan microspheres(Fe3O4@CS/PEI) with different proportions were thereby prepared by Schiff base reaction in the emulsion system using glutaraldehyde as the crosslinking agent. The structure, particle size and magnetism of microspheres were characterized by infrared spectroscopy(FT-IR), X-ray powder diffraction(XRD), scanning electron microscope(SEM), dynamic laser scatter(DLS) and hysteresis loop. The adsorption amount of ibuprofen on microspheres and reuse rate were studied by ultraviolet spectrophotometer. The characterization results showed that the microspheres were successfully prepared by Schiff base reaction, which had no effect on the crystal phase of Fe3O4. The microspheres presented regular circle with narrow size distribution and they were magnetic. The thermodynamics adsorption model of ibuprofen on microspheres was Langmuir adsorption isotherm, and the kinetic adsorption model was second order dynamics model. With the increase of PEI mass fraction, the adsorption amount of ibuprofen on microspheres were increased. When m(PEI)∶m(CS)=1∶1, the maximum adsorption amount of ibuprofen on CP-3(Fe3O4@CS/PEI) was determined to be 138.63 mg/g by the Langmuir adsorption equation fitting, which was twice higher than that on CP-0(Fe3O4@CS). After repeating adsorption experiments for 5 times, the microspheres still showed good adsorption performance for ibuprofen.
作者
高琦
黄海龙
韩卢
徐敏
GAO Qi;HUANG Hailong;HAN Lu;XU Min(Shanghai Key Laboratory of Magnetic Resonance,School of Physics and Materials,East China Normal University,Shanghai 200062,China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2020年第2期165-171,共7页
Journal of Functional Polymers
基金
国家重点研发计划(2018YFC1602800)。
