Fabrication and Evaluation of Magnetic/Hollow Double-Shelled Imprinted Sorbents Formed by Pickering Emulsion Polymerization

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• 作者：Jianming Pan ; Linzi Li ; Hui Hang ; Runrun Wu ; Xiaohui Dai ; Weidong Shi ; Yongsheng Yan
• 刊名：Langmuir
• 出版年：2013
• 出版时间：June 25, 2013
• 年：2013
• 卷：29
• 期：25
• 页码：8170-8178
• 全文大小：461K
• 年卷期：v.29,no.25(June 25, 2013)
• ISSN：1520-5827

文摘

Magnetic/hollow double-shelled imprinted polymers (MH-MIPs) were synthesized by Pickering emulsion polymerization. In this method, attapulgite (ATP) particles were used as stabilizers to establish a stable oil-in-water emulsion, and a few hydrophilic Fe₃O₄ nanoparticles were allowed to be magnetic separation carriers. The imprinting system was fabricated by radical polymerization in the presence of the functional and polymeric monomers in the oil phase. The results of characterization indicated that MH-MIPs exhibited magnetic sensitivity (M_s = 4.76 emu g^鈥?), thermal stability (especially below 200 掳C), and hollow structure and were composed of exterior ATP shells and interior imprinted polymers shells. Then MH-MIPs were evaluated as sorbents for the selective binding of 位-cyhalothrin as a result of their magnetism, enhanced mechanical strength, hydrophilic surface, and recognition ability. The kinetic properties of MH-MIPs were well described by the pseudo-second-order equation, indicating that the chemical process could be the rate-limiting step in the adsorption process for 位-cyhalothrin. The equilibrium adsorption capacity of MH-MIPs was 60.06 渭mol g^鈥? at 25 掳C, and the Langmuir isotherm model gave a better fit to the experimental data, indicating the monolayer molecular adsorption for 位-cyhalothrin. The selective recognition experiments also demonstrated the high affinity and selectivity of MH-MIIPs toward 位-cyhalothrin over fenvalerate and diethyl phthalate.