双酚A磁性分子印迹聚合物的制备及性能研究

Study on preparation and characters of BPA magnetic molecularly imprinted polymers

采用共沉淀法制备出磁性Fe3O4纳米粒子,利用凝胶溶胶法进行表面包覆Si O2得到Fe3O4-Si O2纳米粒子,并且以此作为磁核、双酚A作为模板分子、α-甲基丙烯酸作为功能单体、二乙烯基苯为交联剂、偶氮二异丁腈为引发剂乳液聚合制备出磁性双酚A分子印迹聚合物,通过红外衍射光谱(FT—IR)、透射电镜(TEM)以及振动样品磁强计(VSM)对聚合物的表面形貌、结构、磁性质等进行表征。结果表明:聚合物粒径分布均匀,在15 nm左右,磁响应性好,吸附动力学试验表明印记聚合物对双酚A的吸附性能大于非印记聚合物,且聚合物对双酚A具有较高的选择吸附性,Scatchard方程分析得出MIPS对BPA表观最大吸附量为126.44μmol/g。

Fe3O4magnetic nanoparticles were prepared by coprecipitation method and coated with Si O2 via a sol-gel process,then a magnetic molecularly imprinted polymers（Fe3O4—MIPS） of bisphenol A were prepared by emulsion polymerization using BPA as template,α-methacrylicas as functional monomer,divinylbenzene as cross-linker,azobisobutyronitrile as initior.The Fe3O4—MIPS were characterized by Fourier transform infrared spectroscopy（FT—IR）,Transmission electron microscopy（TEM）and Sample vibrating magnetometry（VSM） in order to elucidate the morphology,magnetic and other properties,the results showed that they possessed uniform distribution of particle size,which was about 15 nm,and with a good magnetic property.The results of adsorption experiment indicated that the Fe3O4—MIPS have a much higher adsorbability than Fe3O4—MNIPS,and it had a high selective adsorption for BPA,the Scatchard analysis results demonstrate that the maximum apparent adsorption quantity of BPA was 126.44 μmol / g.