表面接枝法制备磁性邻苯二甲酸二丁酯印迹聚合物及其识别性能研究

采用表面接枝法对四氧化三铁纳米粒子表面进行功能化修饰,以二甲基丙烯酸乙二醇酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,成功制备了对邻苯二甲酸二丁酯(DBP)具有特异识别性能的磁性表面印迹聚合物(MMIPs).利用扫描电镜、透射电镜、振动样品磁强计、元素分析、红外光谱等对其进行表征.BET测试结果表明,MMIPs的比表面积(380 m2/g)大于MNIPs(324 m2/g).吸附动力学、等温线模型分析显示,MMIPs对DBP的Sips等温线模型相关系数R2=0.999,动力学Pseudo-second-order 模型相关系数(R2)为0.9797.对邻苯二甲酸二烯丙酯(DAP)、DBP和邻苯二甲酸二(2-乙基己基)酯(DEHP)的印迹因子分别为1.53、2.21和1.39,对DBP具有较高的印迹因子和较好的识别性能.磁性分子印迹聚合物经5次再生后,对DBP的吸附能力仅下降了12.3％,表明再生循环效果较好.

Preparation of Magnetic Imprinted Polymer by Surface Grafting and Its Recognition Performance for Dibutyl Phthalate

The magnetic molecularly imprinted polymers (MMIPs), based on the surface of magnetic nanoparticles being modified by surface grafting, have been successfully synthesized, with dibutyl phthalate (DBP) as template molecule, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent and azobisisobutyronitrile (AIBN) as initiator. Scanning electron microscopy (SEM), transmission electron microscope (TEM), and elemental analysis were employed to characterize the MMIPs. The structure and magnetic properties of the MMIPs were investigated by means of X-ray diffraction and vibrating sample magnetometer. The BET surface area shows that MMIPs is 380 m2/g and MNIPs is 324 m2/g. A series of static adsorption experiments were conducted to analyze its adsorption performance, which followed pseudo-second-order model by the kinetic analysis with correlation coefficient (R2) 0.9797, and Sips equation with correlation coefficient (R2) 0.999 by the isothermal analysis. The imprinting factors of diallyl phthalate (DAP), DBP and di-2-ethylhexyl phthalate (DEHP) were 1.53, 2.21 and 1.39 respectively, showing that MMIPs had better recognition performance for DBP. The experiment of regeneration recycles with five times showed the regeneration ability of DBP was only reduced by 12.3％.