Liu Yafei, Shi Yiyu, Cui Yan, Zhao Fen, Chen Mindong
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Materials (Basel). 2022 Apr 2;15(7):2628. doi: 10.3390/ma15072628.
Magnetic polymers are often used as loading materials for ionic liquids because of their excellent magnetic separation properties. In this study, a novel imidazolium-based ionic liquid-modified magnetic polymer was synthesized by suspension polymerization and grafting, denoted as γ-FeO@GMA@IM, and this magnetic polymer was used for the adsorption of the acid dye FCF. The magnetic polymer was characterized by SEM, FTIR, XRD, VSM and TGA. These techniques were used to reveal the overall physical properties of magnetic polymers, including the presence of morphology, functional groups, crystalline properties, magnetism and thermal stability. Studies have shown that γ-FeO@GMA@IM can adsorb FCF in a wide pH range (2-10), with a maximum adsorption capacity of 445 mg/g. The adsorption data were more in line with the pseudo-second-order kinetic model and the Freundlich isotherm. In order to investigate its reusability, this study used 10% NaCl as the desorption solution, and carried out five batches of adsorption-desorption cycles. After five cycles, the adsorption effect was maintained at 98.3%, which showed a good recycling performance.
磁性聚合物因其优异的磁分离性能，常被用作离子液体的负载材料。在本研究中，通过悬浮聚合和接枝法合成了一种新型的咪唑基离子液体改性磁性聚合物，记为γ-FeO@GMA@IM，并将该磁性聚合物用于酸性染料FCF的吸附。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、振动样品磁强计（VSM）和热重分析（TGA）对磁性聚合物进行了表征。这些技术用于揭示磁性聚合物的整体物理性质，包括形态、官能团、晶体性质、磁性和热稳定性。研究表明，γ-FeO@GMA@IM在较宽的pH范围（2-10）内均可吸附FCF，最大吸附量为445 mg/g。吸附数据更符合准二级动力学模型和Freundlich等温线。为了研究其可重复使用性，本研究使用10% NaCl作为解吸溶液，进行了五批次的吸附-解吸循环。经过五次循环后，吸附效果保持在98.3%，显示出良好的循环性能。
