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以聚乙烯醇修饰的多壁碳纳米管(MWCNTs)为基材,熊果酸(UA)为模板分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,采用表面印迹技术在碳纳米管表面合成对熊果酸具有良好选择性的分子印迹聚合物(MWCNTs-MIPs).讨论了不同摩尔比例的功能单体与模板分子合成印迹聚合物的效果,得出最佳的摩尔比为4∶1.采用红外光谱、扫描电镜对该印迹聚合物进行表面形态表征,结果表明在碳纳米管表面接枝一层稳定、均匀、20～25 nm厚的印迹材料.采用静态吸附和吸附动力学实验研究其吸附性能,结果表明MWCNTs-MIPs对熊果酸具有特异吸附性,其最大吸附量为53.1μmol/g,在60 min时达到吸附平衡.优化固相萃取条件,结果表明采用100%甲醇溶液淋洗和10%乙酸甲醇溶液洗脱效果最好.将该印迹聚合物装填于固相萃取柱中,可将熊果酸与其结构类似物齐墩果酸进行分离.
Poly (vinyl alcohol) - modified MWCNTs were used as substrate materials, ursolic acid (UA) as template, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) (MWCNTs-MIPs) with good selectivity to ursolic acid on the surface of carbon nanotubes by surface-imprinting technique.The synthesis of imprinted polymers with different molar ratios of functional monomers and template molecules The results showed that the best molar ratio was 4:1.The surface morphology of the imprinted polymer was characterized by FTIR and SEM.The results showed that the grafted polymer was stable and uniform on the surface of carbon nanotubes with 20-25 nm Thick imprinting material.The adsorption of MWCNTs-MIPs on ursolic acid was studied by static adsorption and adsorption kinetics experiments.The results showed that MWCNTs-MIPs adsorbed ursolic acid at a maximum of 53.1μmol / g and adsorbed equilibrium at 60min. The results of solid-phase extraction (SPE) optimization showed that the best elution was achieved with 100% methanol solution and 10% acetic acid methanol solution.The imprinted polymer was packed in solid phase extraction column Oleanolic acid separation.