Taking the advantages of surface imprinting, multi-template imprinting and magnetic separation, a novel magnetic multi-template molecularly imprinted polymer (mag-MMIP@MWCNTs) was prepared by using MWCNTs as support material, Fe3O4 as magnetic core, and dimethyl phthalate (DMP), diethyl phthalate (DEP), and dibutyl phthalate (DBP) as template molecules. This composite was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), and the Brunauer-Emmett-Teller (BET) analysis, and was used for the simultaneous adsorption of DMP, DEP, and DBP in aqueous solution. The effects of solution pH, contact time, PAEs initial concentration, temperature, adsorption selectivity, and reusability were investigated and discussed in detail. The results demonstrated that mag-MMIP@MWCNTs exhibited fast kinetics, good magnetic separation, and excellent selectivity for the adsorption of three phthalate esters (PAEs). The adsorption kinetics followed pseudo second-order kinetic model and the adsorption thermodynamics followed Langmuir isothermal model very well, and the maximum adsorption capacities (Qmax) of DMP, DEP, and DBP were obtained as 0.95, 1.38, and 7.09 mg g-1, respectively. The Scatchard analysis revealed that the template-polymer system had a two-site binding behavior. The adsorption thermodynamic studies indicated that the adsorption processes were exothermic and spontaneous, and dominated by physical adsorption relying on hydrogen bond, hydrophobic interaction, and van der Waals force. Mag-MMIP@MWCNTs also showed good reproducibility and reusability for simultaneous adsorption of the three PAEs. The potential application of mag-MMIP@MWCNTs was proved by the removal of DMP, DEP, and DBP spiked in environmental water samples.

中文翻译：

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基于多壁碳纳米管的磁性多模板分子印迹聚合物的制备，用于吸附水样品中的邻苯二甲酸酯。

利用表面印迹，多模板印迹和磁分离的优势，以MWCNTs为载体，Fe3O4为磁芯，邻苯二甲酸二甲酯（DMP）为载体，制备了一种新型的磁性多模板分子印迹聚合物（mag-MMIP @ MWCNTs）。 ），邻苯二甲酸二乙酯（DEP）和邻苯二甲酸二丁酯（DBP）作为模板分子。通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），振动样品磁力计（VSM）和Brunauer-Emmett-Teller（BET）分析对该复合物进行表征，并用于同时吸附DMP， DEP和DBP在水溶液中。研究并详细讨论了溶液pH值，接触时间，PAE初始浓度，温度，吸附选择性和可重复使用性的影响。结果表明，mag-MMIP @ MWCNTs表现出快速的动力学，良好的磁分离和对三种邻苯二甲酸酯（PAE）吸附的优异选择性。吸附动力学遵循拟二级动力学模型，吸附热力学遵循Langmuir等温模型，DMP，DEP和DBP的最大吸附容量（Qmax）为0.95、1.38和7.09 mg g-1，分别。斯卡查德分析表明，模板-聚合物系统具有两个位点的结合行为。吸附热力学研究表明，吸附过程是放热的，自发的，主要依靠依靠氢键，疏水作用和范德华力的物理吸附。Mag-MMIP @ MWCNTs还显示出良好的重现性和可重复使用性，可同时吸附三种PAE。通过去除环境水样中的DMP，DEP和DBP，证明了mag-MMIP @ MWCNTs的潜在应用。