雌激素多模板分子印迹磁性金属有机骨架复合材料的制备及其吸附性能研究

Synthesis and adsorption performance of estrogens multi-template molecularly imprinted magnetic metal organic framework composite material

以6种雌激素为模板分子,磁性金属有机骨架M-MIL-101(Cr)为载体,制备了一种新型分子印迹聚合物(MIPs)复合材料,对水溶液中的雌酮(E1)、雌二醇(E2)、雌三醇(E3)、乙炔雌二醇(EE2)、己烯雌酚(DES)和己烷雌酚(HEX)进行同步选择性吸附分离.同时,采用扫描电子显微镜、傅里叶变换红外光谱、X射线衍射仪等对材料进行了表征,并考察了MIPs复合材料对6种雌激素的吸附特性.结果表明,MIPs对6种雌激素的吸附过程遵循准二级动力学模型和Langmuir模型,平衡时间约为30~60 min,温度为298 K时的平衡吸附容量为38.99 mg·g^(-1).吸附热力学数据显示,吸附过程一个放热的、自发性的过程.材料对双酚A、黄体酮的相对选择性系数在1.52~7.35之间,经过4次吸附-脱附循环后,吸附容量仍能达到原来的93%,表明MIPs复合材料具备良好的选择性与再生性能.

A novel multi-template molecularly imprinted polymers(MIPs)composite was prepared on the surface of magnetic metal-organic frameworks M-MIL-101(Cr),using six estrogens as the templates,to achieve simultaneous and selective adsorption separation of six estrogens from aqueous solution,including estrone(E1),estradiol(E2),estriol(E3),ethynyl estradiol(EE2),diethylstilbestrol(DES)and hexestrol(HEX).The MIPs composite was characterized by scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray diffraction,etc.The adsorption behaviors of the MIPs composite towards six estrogens were investigated.Results indicated that the adsorption process followed the pseudo-second-order kinetic model and Langmuir isotherm model,while the equilibrium time were 30~60 min and the equilibrium adsorption capacities of the MIPs were 38.99 mg·g^(-1) at 298 K.The adsorption thermodynamic data showed that it was an exothermic and spontaneous adsorption process.The relative selectivity coefficients for the six estrogens with respect to progesterone and bisphenol A were in the range of 1.52~7.35,and the adsorption capacity maintained 93% of the original amount after four cycles of adsorption-desorption,which indicated that the MIPs composite material had good selectivity and regeneration ability.