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

• DOI: 10.1021/la4015288
• Publication Date: 2013-05-27T15:37:49Z
• Authors: Jianming Pan; Linzi Li; Hui Hang; Runrun Wu; Xiaohui Dai; Weidong Shi; Yongsheng Yan
• Keywords: Pickering emulsion; Emulsion polymerization

Magnetic/hollow double-shelled imprinted polymers (MH-MIPs) were synthesized by Pickering emulsion polymerization. In this method, attapulgite (ATP) particles used as stabilizers to establish a stable oil-in-water emulsion, and few hydrophilic Fe3O4 nanoparticles allowed be magnetic separation carriers. The imprinting system was fabricated radical polymerization in the presence of functional polymeric monomers oil phase. results characterization indicated that MH-MIPs exhibited sensitivity (Ms = 4.76 emu g(-1)), thermal stability (especially below 200 °C), hollow structure composed exterior ATP shells interior shells. Then evaluated sorbents for selective binding λ-cyhalothrin result their magnetism, enhanced mechanical strength, surface, recognition ability. kinetic properties well described pseudo-second-order equation, indicating chemical process could rate-limiting step adsorption λ-cyhalothrin. equilibrium capacity 60.06 μmol g(-1) at 25 °C, Langmuir isotherm model gave better fit experimental data, monolayer molecular experiments also demonstrated high affinity selectivity MH-MIIPs toward over fenvalerate diethyl phthalate.