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以乙烯基修饰的磁性碳纳米管为基质,Pb2+为模板,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,制备出一种对Pb2+具有特异吸附能力的新型磁性印迹聚合物(MWNTs/MIIPs)。采用扫描电镜、红外光谱和振动样品磁强计等技术并对该印迹聚合物的形态、化学结构和性能进行表征。吸附实验结果表明,所制备的MWNTs/MIIPs对Pb2+具有良好的吸附和选择识别能力,最大吸附量为25.9 mg/g;选择吸附实验结果表明,Pb2+/Cu2+,Pb2+/Zn2+,Pb2+/Co2+,Pb2+/Mg2+,Pb2+/Cd2+以及Pb2+/Ni2+的选择因子分别是2.3,2.5,2.1,2.2,2.1和2.4。结合原子吸收光谱分析技术,此MWNTs/MIIPs成功应用于实际样品中微量Pb2+的分离富集,富集倍数可达40.5倍。
The magnetic properties of Pb2 + were studied by using vinyl-modified magnetic carbon nanotubes as matrix, Pb2 + as template, methacrylic acid as functional monomer and ethylene glycol dimethacrylate as crosslinking agent. Imprinted polymers (MWNTs / MIIPs). The morphology, chemical structure and properties of the imprinted polymer were characterized by scanning electron microscopy, infrared spectroscopy and vibrating sample magnetometer. The results of adsorption experiments showed that the prepared MWNTs / MIIPs had good adsorption and selective recognition ability for Pb2 + with the maximum adsorption capacity of 25.9 mg / g. The results of selective adsorption experiments showed that Pb2 + / Cu2 +, Pb2 + / Zn2 +, Pb2 + / Co2 + The selectivity factors for / Mg2 +, Pb2 + / Cd2 + and Pb2 + / Ni2 + are 2.3, 2.5, 2.1, 2.2, 2.1 and 2.4, respectively. Combined with atomic absorption spectroscopy, this MWNTs / MIIPs has been successfully applied to the separation and enrichment of trace Pb2 + in practical samples with enrichment multiple of up to 40.5 times.