对苯基苯酚分子印迹聚合物的制备及其吸附性能研究

The Synthesis of p-phenylphenol Molecularly Imprinted Polymers and Investigation of Its Adsorption Characteristics

以对苯基苯酚(PPP)为模板分子,甲基丙烯酸(MAA)和4-乙烯基吡啶(4-Vpy)为功能单体,采用本体聚合法制备PPP的印迹聚合物(MIPs),对不同比例功能单体与模板分子的预聚反应体系进行紫外光谱扫描。试验结果表明,4-Vpy作为功能单体,吸收峰变化明显,当模板分子与两种功能单体的物质的量比为1∶2时,吸收峰变化最大。动态吸附性能试验结果表明,MIPs和NIPs在一定时间内可达到吸附平衡,其中NIPs速度较快。模板分子与功能单体不同比例聚合物吸附量和吸附性能有一定的差异,由PPP-4-Vpy(1/2)制备的MIPs吸附量小于PPP-4-Vpy(1/3)制备的MIPs。PPP-4-Vpy(1/4)制备的MIPs和以MAA为不同比例功能单体制备的MIPs未见明显特异性吸附效果。静态吸附试验结果表明,PPP-4-Vpy(1/3)制备的MIPs吸附性Q(2.87μmol/g)大于PPP-4-Vpy(1/2)制备的MIPs(1.44μmol/g)。在保证聚合物刚性结构的前提下,适当降低聚合物的颗粒度可提高其吸附性。

In this experiment, the bulk polymerization reaction was employed to synthesize molecularly imprinted polymers（MIPs）for p-phenylphenol recognition using p-phenylphenol（PPP） as template, α-methacrylic acid（MAA） and 4-vinyl pyridine（4-Vpy） as functional monomers. Ultraviolet spectrum scanning was performed with the prepolymerization system prepared by different proportions of functional monomers and the template molecule. The results showed that absorption peak changes significantly when the functional monomer was 4-Vpy. The changes of absorption peak was maximum when the template molecule and two kinds of functional monomers with a molar ratio of 1/2. The dynamic adsorption performance test results show that MIPs and NIPs could reach equilibrium within a certain time with NIPs much faster. The adsorption of the MIPs prepared with PPP-4-Vpy（1/2） was less than MIPs prepared with PPP-4-Vpy（1/3）.There is no obvious specificity adsorption effect with MIPs prepared with PPP-4-Vpy（1/4） and different proportions of MAA as functional monomers. Static adsorption experiment results showed that the adsorption of the MIPs Q（2.87 μmol/g） prepared with PPP-4-Vpy（1/3） was greater than that Q（1.44 μmol/g） prepared with PPP-4-Vpy（1/2）. Ensuring the premise of the polymer rigid structure, appropriate to reduce the particle size of the polymer can be improved adsorption.On the premise of guaranteeing the rigid structure of the polymers, the adsorption of the polymers could be improved if we reduced the particle size of polymers appropriately.