Li Jing, Zhou Qingxiang, Yuan Yongyong, Wu Yalin
Beijing Key Laboratory of Oil and Gas Pollution Control, College of Geosciences, China University of Petroleum Beijing, Beijing 102249, People's Republic of China.
R Soc Open Sci. 2017 Aug 16;4(8):170672. doi: 10.1098/rsos.170672. eCollection 2017 Aug.
Iron-based magnetic molecular imprinted polymers (Fe@SiO@MIP) were synthesized for highly selective removal and recognition of di--pentyl phthalate (DnPP) from water. Well-defined core-shell Fe@SiO nanoparticles (less than 70 nm) were decorated on MIPs reticular layers to endow DnPP-MIPs with magnetic property for the first time. Five other phthalic acid esters including dimethyl phthalate, diethyl phthalate, dipropyl phthalate, di--butyl phthalate and di-iso-octyl phthalate were used to investigate the adsorptive selectivity to DnPP. The designed experiments were carried out to explore the adsorption kinetics, isotherms and thermodynamics and the results demonstrated that the adsorption was a spontaneous, exothermal and physical adsorption process. The materials were proved to be excellent adsorbents in removal of DnPP with an adsorption capacity as high as 194.15 mg g in optimal condition. Furthermore, a magnetic solid phase extraction with Fe@SiO@MIP coupled to high-performance liquid chromatography method was successfully developed for the determination of DnPP, and the proposed method achieved a good linear range of 0.5-250 µg l with a correlation coefficient () of 0.999 and low limit of detection (LOD) of 0.31 µg l. These materials exhibited excellent capacity in removal and highly sensitive identification of DnPP from aqueous environment samples, and opened a valuable direction for developing new adsorbents for the removal and enrichment of important pollutants.
合成了铁基磁性分子印迹聚合物（Fe@SiO@MIP），用于从水中高效选择性去除和识别邻苯二甲酸二正戊酯（DnPP）。首次在MIPs网状层上修饰了尺寸明确的核壳型Fe@SiO纳米颗粒（小于70nm），赋予DnPP-MIPs磁性。使用包括邻苯二甲酸二甲酯、邻苯二甲酸二乙酯、邻苯二甲酸二丙酯、邻苯二甲酸二正丁酯和邻苯二甲酸二异辛酯在内的其他五种邻苯二甲酸酯来研究对DnPP的吸附选择性。开展了设计实验以探究吸附动力学、等温线和热力学，结果表明该吸附是一个自发、放热的物理吸附过程。在最佳条件下，该材料被证明是去除DnPP的优良吸附剂，吸附容量高达194.15mg/g。此外，成功开发了一种Fe@SiO@MIP磁性固相萃取结合高效液相色谱法用于测定DnPP，该方法实现了0.5-250μg/L的良好线性范围，相关系数（r）为0.999，检测限（LOD）低至0.31μg/L。这些材料在从水环境样品中去除和高灵敏识别DnPP方面表现出优异的能力，为开发用于去除和富集重要污染物的新型吸附剂开辟了一条有价值的方向。
