Laboratorio de Química, Centro de Investigacións Tecnolóxicas, Universidade da Coruña, Campus de Esteiro s/n, Ferrol 15403, Spain.
Anal Chim Acta. 2011 Nov 14;706(2):275-84. doi: 10.1016/j.aca.2011.09.002. Epub 2011 Sep 9.
Molecularly imprinted polymers (MIPs) are currently used to provide selectivity in chemical sensors. In this context, a non-covalent bisphenol-A (BPA)-imprinted polymer using 4-vinylpyridine (4-Vpy) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinker and a low volatile solvent, triethylene glycol dimethyl ether (TRIGLYME), in combination with a non-reactive linear polymer, poly (vinyl acetate) (PVAc), as porogen, was synthesized with a simple polymerization procedure. Batch rebinding experiments were carried out to evaluate the binding and selectivity properties of the BPA-MIP. The experimental adsorption isotherms were fitted and a heterogeneous distribution of the binding sites was found. The selectivity of MIP demonstrated higher affinity for target BPA and BPA-analogues over other common water pollutants. The adsorption kinetics followed the pseudo-second-order kinetic model so that the specific adsorption in the imprinted cavities by two strong hydrogen bonds could be described as a chemisorption process. The diffusion mechanism was determined by the intra-particle diffusion and Boyd models, both of them revealing that the adsorption was mainly governed by intra-particle diffusion. MIP was shown to be promising for regeneration without significant loss in adsorption capacity.
分子印迹聚合物（MIPs）目前被用于为化学传感器提供选择性。在这种情况下，使用 4-乙烯基吡啶（4-Vpy）作为功能单体、乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂和挥发性低的溶剂三乙二醇二甲醚（TRIGLYME），结合非反应性线性聚合物聚（醋酸乙烯酯）（PVAc）作为致孔剂，合成了一种非共价键双酚 A（BPA）印迹聚合物，其聚合过程简单。进行了批量再结合实验以评估 BPA-MIP 的结合和选择性特性。实验吸附等温线进行了拟合，发现了结合位点的不均匀分布。MIP 的选择性表现出对目标 BPA 和 BPA 类似物的亲和力高于其他常见的水污染物。吸附动力学遵循准二级动力学模型，因此两个强氢键在印迹空穴中的特异性吸附可以描述为化学吸附过程。扩散机制由内扩散和 Boyd 模型确定，它们都表明吸附主要受内扩散控制。MIP 显示出在不显著损失吸附容量的情况下进行再生的潜力。
