(壳聚糖/γ-Fe2O3)@C磁性复合材料表面印迹聚合物选择性吸附2,4,5-TCP的研究

A Study on Preferential Adsorption of 2,4,5-Trichlorophenol by an Imprinted Polymer on the Surface of a (Chitosan/maghemite)@C Magnetic Composite

摘要:

本文采用乳液聚合法合成碳基磁性碳球（壳聚糖/γ-Fe2O3）@C，并在其表面上引入乙烯基，以2,4,5-三氯酚（2,4,5-TCP）为模板分子、甲基丙烯酸(MAA)为功能单体、乙二醇二甲基丙烯酸酯（EGDMA）为交联剂制备磁性碳球表面印迹聚合物。并利用扫描电子显微镜、紫外分光光度计、振动样品磁强计和热重分析仪等表征手段对其形貌、结构等物理化学性能进行表征，研究其热稳定性和磁稳定性，考察其作为吸附剂对2,4,5-三氯酚的吸附性能及选择性能。研究结果表明，磁性碳球和磁性碳球表面印迹聚合物（MMIPs）的饱和磁强度分别为4.3 emu/g和1.7 emu/g。吸附平衡数据表明其符合Freundlich吸附等温模型，平衡吸附量大约为200 mg/g，吸附符合准二级动力学方程，平衡吸附时间大约为10 min，印迹吸附剂对模板分子吸附量最佳，且存在明显特异性吸附。

Abstract:

A carbon-based magnetic carbon sphere of (chitosan/maghemite)@C was synthesized by emulsion polymerization, and vinyl groups were introduced into its surface. The imprinted polymer on the magnetic carbon sphere surface was prepared using 2,4,5-trichlorophenol (TCP) as a template molecule, methacrylic acid (MAA) as a functional monomer, and ethylene glycol dimethylacrylate (EGDMA) as the cross-linker. The morphology, structure, and other physicochemical properties of the formed material were characterized by means of a scanning electron microscope (SEM), ultraviolet (UV) spectrophotometer, vibration sample magnetometer (VSM), and thermogravimetric analyzer (TGA). Thermostability and magnetic stability of the material were studied, and the adsorption performance and selectivity of the material as an adsorbent for 2,4,5-TCP were investigated. The results indicated that saturation magnetization values of the magnetic carbon sphere and magnetic carbon sphere surface imprinted polymers (MMIPs) were 4.3 and 1.7 emu/g, respectively. The equilibrium adsorption data conformed to the Freundlich isotherm model, equilibrium adsorption capacity was ~200 mg/g, and the kinetics followed a second-order kinetic equation. The adsorption equilibrium time was approximately ten minutes, and the imprinted sorbent showed optimal adsorption on the template molecule, with significant specific adsorption.