多壁碳纳米管表面对硝基苯酚印迹复合材料的制备与吸附性能

以多壁碳纳米管表面接枝的L-苯丙氨酸为结合位点,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,采用沉淀聚合技术,在碳纳米管表面制备了对硝基苯酚印迹复合材料.采用红外光谱和扫描电镜研究了该印迹复合材料的结构和形貌,结果表明,在碳纳米管表面接枝了一层稳定的印迹材料.采用高效液相色谱研究了该印迹材料的等温吸附性能,结果表明,该印迹材料对模板分子具有较大的吸附容量(Qmax=80.5μmol/g)和良好的选择吸附性能(选择因子达2.5).以该印迹材料作为固相萃取吸附剂,研究了它对对硝基苯酚和其它结构类似物混合溶液的动态吸附性能,结果表明,印迹复合材料对对硝基苯酚的吸附容量不受结构类似物浓度的影响,能较好地应用于对硝基苯酚的分离富集检测.

Preparation and Adsorption Properties of p-Nitrophenol Imprinted Materials Based on Multi-walled Carbon Nanotubes Surface

Novel molecularly imprinted polymers were prepared successfully by employing multi-walled carbon nanotubes(MWNT) as the supported matrix, grafting of L-phenylalanine on the MWNT surface as the binding site, p-nitrophenol as template, methacrylic acid(MAA) as functional monomer and ethyleneglycol dimethyacrylate(EGDMA) as cross-linker. The molecularly imprinted materials were characterized with infrared spectroscopy(IR) and scanning electron microscopy(SEM). The results show that a stable imprinted layer is grafted on the MWNT surface. The static adsorption experiments were also executed. A large adsorption capacity Qmax of 80.5 μmol/g and an excellent selectivity for the template of 2.5 were obtained. As solid-phase extraction adsorbents, the imprinted material was applied to study the dynamic adsorption of p-nitrophenol from a mixture of p-nitrophenol and other structural analogues. The results show that the imprinted materials can apply to the separation of p-nitrophenol from a mixture solution.