PAEs同分异构体双模板分子印迹聚合物的制备及性能

为高效去除液体中邻苯二甲酸酯（PAEs）,以邻苯二甲酸二（2-乙基）己酯（DEHP）为模板分子,邻苯二甲酸二正辛酯（DNOP）为辅助模板分子,二氧化硅改性磁性纳米四氧化三铁（Fe₃O₄@SiO₂）为载体,α-甲基丙烯酸（MAA）为功能单体,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,采用本体热引发聚合法制备吸附性能优于传统单模板分子印迹聚合物,且能对两种目标物质同时进行吸附的双模板分子印迹聚合物（D-MIPs）,并对其具体吸附性、选择性及再生性进行详细研究.结果表明:辅助模板分子DNOP的引入对DEHP的吸附性能起到优化促进作用；D-MIPs对于10种不同浓度DEHP的单位吸附量为0.49～6.16 mg/g,其单位吸附量与吸附速率均优于其单模板印迹聚合物（DEHP-MIPs）；两种模板分子均与所选单体之间存在多位点的协同作用；D-MIPs在30 min前可达到最佳吸附平衡状态；第5次的吸附容量为第1次的84.02%,且具有良好的再生性能.静态吸附过程拟合表明,聚合物体系更加符合单层特异性吸附的Langmuir吸附模型,D-MIPs与DEHP-MIPs对目标分子的吸附符合伪二级动力学过程；FT-IR红外光谱对印迹聚合物进行官能团表征证实聚合效果良好.

Preparation and properties of double template molecularly imprinted polymers with phthalate isomers

To efficiently remove phthalates (PAEs) from liquid, di(2-ethyl)hexyl phthalate (DEHP) was used as template molecule, di-n-octyl phthalate (DNOP) as auxiliary template molecule, silicon dioxide modified magnetic nano-ferric tetroxide (Fe₃O₄@SiO₂) as carrier, alpha-methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinking agent, and azodiisobutyronitrile (AIBN) as lead in this experiment. The bulk thermal initiation polymerization method was used to prepare double template molecularly imprinted polymers (D-MIPs) which had better adsorption performance than traditional single template molecularly imprinted polymers and could adsorb both target substances simultaneously. The specific adsorption, selectivity, and regeneration of D-MIPs were studied in detail. Results show that the introduction of the DNOP auxiliary template molecule could optimize the adsorption performance of DEHP. The unit adsorption capacity of D-MIPs for 10 DEHPs with different concentrations ranged from 0.49 mg/g to 6.16 mg/g, and the unit adsorption capacity and adsorption rate of D-MIPs were both superior to those of DEHP-MIPs. There were multi-site synergies between the two template molecules and the selected monomer, and D-MIPs could reach the optimal adsorption equilibrium state in 30 min. The adsorption capacity at the fifth time was 84.02% more than that at the first time, and it had good regeneration performance. Static adsorption process fitting indicates that the polymer system was more consistent with the single layer specific adsorption Langmuir adsorption model. The adsorption of D-MIPs and DEHP-MIPs on the target molecules was in accordance with the pseudo-second-order kinetics process. FT-IR infrared spectroscopy on the imprinted polymer characterization of the functional groups confirmed that the polymerization effect was good.