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以双酚A(BPA)为模板分子,甲基丙烯酸为单体,乙二醇二甲基丙烯酸酯作为交联剂,在硅胶表面合成双酚A分子印迹聚合物。通过红外光谱、比表面积测定等对表面印迹聚合物进行分析和表征;采用静态吸附法和动态吸附法对其吸附性能进行考察。红外光谱表明硅胶表面生成了对模板分子具有识别功能的官能团;热重分析证明该印迹聚合物具有良好的热稳定性;静态吸附实验说明表面印迹聚合物比非印迹聚合物具有良好的吸附性能,该印迹聚合物对双酚A最大吸附容量Q max为1.501 mg/g,吸附速率常数k为0.01586g/(mg·min)。用表面印迹聚合物萃取(MISPE)和气相色谱质谱(GC-MS)联用检测了BPA样品,BPA的回收率接近90%,并将该双酚A表面印迹聚合物用于牛奶样品中的BPA测试,结果表明该印迹聚合物具有较好的吸附选择性。
Bisphenol A molecularly imprinted polymer was synthesized on the surface of silica gel by using bisphenol A (BPA) as template, methacrylic acid as monomer and ethylene glycol dimethacrylate as crosslinking agent. The surface imprinted polymer was analyzed and characterized by infrared spectroscopy, specific surface area measurement and so on. The adsorption properties were investigated by static adsorption and dynamic adsorption. IR spectra showed that the functional groups on the surface of silica gel were identified. The thermal gravimetric analysis showed that the imprinted polymer had good thermal stability. The static adsorption experiments showed that the surface imprinted polymer had better adsorption properties than the non-imprinted polymer. The maximum adsorption capacity of bisphenol A for the imprinted polymer was 1.501 mg / g and the adsorption rate constant k was 0.01586 g / (mg · min). BPA samples were tested for BPA by a combination of surface-imprinted polymer extraction (MISPE) and gas chromatography-mass spectrometry (GC-MS) with a recovery of nearly 90% and the BPA surface-imprinted polymer was used in a BPA The results show that the imprinted polymer has good adsorption selectivity.