中空型分子印迹聚合物的制备及其对4-甲基二苯并噻吩的吸附性能研究

Preparation and research of a hollow molecular imprinted polymer for adsorption of 4-methyl dibenzothiophene

以SiO2为载体,4-乙烯基吡啶为功能单体,结合牺牲载体法合成了一种具有特异性识别4-甲基二苯并噻吩的中空型分子印迹聚合物。利用傅立叶变换红外光谱、氮气吸附实验、扫描电镜对形态结构进行了表征。通过在模拟油中的静态吸附试验,对印迹聚合物的吸附性能进行了研究。结果表明,在SiO2表面成功地合成了具有多孔结构的分子印迹层,经过牺牲载体法处理后得到的中空分子印迹聚合物具有更好的表面特性,提高了吸附性能。中空型分子印迹聚合物对4-甲基二苯并噻吩表现出良好的特异性识别性能,吸附动力学满足Langergren准二级动力学方程,等温线符合Freundlich等温线模型,吸附热力学研究表明吸附是自发的吸热过程,在328K下的吸附容量为18.31498mg/g,吸附平衡时间为3h。

A hollow molecular imprinted polymer（H-MIP）was synthesized on silica as a sacrificed material by using 4-methyl dibenzothiophene（4-MDBT）as template,4-vinyl pyridine（4-VP）as function monomer.The sorbents were characterized by the Fourier transform infrared spectroscopy,nitrogen adsorption and scanning electron microscopy.The adsorption properties of the sorbents were investigated in the model oil.The results indicated that a molecular imprinted layer with porous structure was successfully synthesized on the surface of silica,and H-MIP not only had better surface characteristics but it also performed good specific recognition to 4MDBT.The adsorption process followed the pseudo-second-order kinetic model,and it was described well by Freundlich isotherm model.The adsorption thermodynamic parameters showed the adsorption was spontaneous endothermic process.The equilibrium adsorption amount reached 18.31498mg/g at the temperature of 328K,and the adsorption time was 3h.