磁性表面分子印迹聚合物(Fe3O4@mSiO2@MIP)的制备及四溴双酚A检测研究

Study on preparation of magnetic surface molecularly imprinted polymer(Fe3O4@mSiO2@MIP)and detection of tetrabromobisphenol A

在四溴双酚A作为模板分子,4-乙烯基吡啶和乙二醇二甲基丙烯酸酯分别作为功能单体和交联剂的条件下,通过在磁性介孔二氧化硅表面引发的可逆加成断裂链转移(RAFT)聚合制备了一种新型表面分子印迹聚合物,并研究了其对四溴双酚A的特异性吸附性能.透射电镜(TEM)显示,印迹聚合物为多层包覆的核壳型结构.氮气吸-脱附实验表明,所制备载体为介孔结构.吸附实验表明,制备的印迹聚合物对TBBPA表现出良好的结合能力,最大吸附量为55.59 mg/g,并且薄的印迹层使之能够在短时间内快速响应.在TBBPA与其结构类似物同时存在的情况下,印迹聚合物仍然表现出对TBBPA的特异性结合能力.同时,由于磁性核的存在,使得印迹聚合物可以借助外磁场的作用方便的从检测体系中分离出来.

A novel surface molecularly imprinted polymer was prepared by reversible addition fragmentation chain transfer(RAFT)polymerization initiated on the surface of magnetic mesoporous silica,and its specific adsorption performance for tetrabromobisphenol A was studied under the condition that tetrabromobisphenol A was used as a template molecule,4-vinylpyridine and ethylene glycol diacrylate were used as functional monomer and crosslinker,respectively.Transmission electron micrographs(TEM)showed that the imprinted polymer was a multi-layered core-shell structure.Nitrogen adsorption-desorption experiments showed that the prepared support was a mesoporous structure.Adsorption experiments showed that the prepared imprinted polymer exhibited good binding ability to TBBPA with a maximum adsorption capacity of 55.59 mg/g,and the thin imprinted layer enabled it to respond quickly in a short time.In the presence of both TBBPA and its structural analogs,the imprinted polymer still exhibited specific binding ability to TBBPA.At the same time,due to the presence of the magnetic core,the imprinted polymer can be easily separated from the detection system by the action of the external magnetic field.