Cao Fengmei, Wang Lei, Tian Ying, Wu Fengchang, Deng Chaobing, Guo Qingwei, Sun Hongwen, Lu Shaoyong
Chinese Research Academy of Environmental Science, State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, Beijing 100012,China; Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
J Chromatogr A. 2017 Sep 22;1516:42-53. doi: 10.1016/j.chroma.2017.08.023. Epub 2017 Aug 12.
This work describes a novel method for the synthesis of molecularly imprinted polymers (MIPs) using 2-(trifluoromethyl) acrylic acid (TFMAA) and 4-vinyl pyridine (4-Vpy) as binary functional monomers, perfluorooctanoic acid (PFOA) as template, and ethyleneglycol dimethacrylate (EGDMA) as cross-linker in the presence of azobisisobutyronitrile (AIBN). The binary functional monomer MIPs were applied to selective recognition for PFOA and perfluorooctanesulfonic acid (PFOS) from aqueous environment. The MIPs were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and microscopic electrophoresis. Thereafter, the adsorption capacity and selectivity of the synthesized MIPs for PFOA and PFOS were evaluated by batch adsorption experiments. The maximum adsorption capacities of the MIPs for PFOA and PFOS were 6.42 and 6.27mg/g, respectively. It was also found that the adsorption capacities remained constant with increasing the solution pH in the range of 2.0-5.0, and then decreased when the pH was further increased. Finally, the novel MIPs can be reused after five cycles of adsorption-desorption-adsorption with no significant decrease of removal rate and have an effective performance in selective removal of PFOA and PFOS in real lake water samples. All the results indicate that the binary functional monomer MIPs have great potential to remove PFOA and PFOS in aqueous environment.
本工作描述了一种合成分子印迹聚合物（MIPs）的新方法，该方法以2-（三氟甲基）丙烯酸（TFMAA）和4-乙烯基吡啶（4-Vpy）作为二元功能单体，全氟辛酸（PFOA）作为模板，乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂，并在偶氮二异丁腈（AIBN）存在的条件下进行。将二元功能单体MIPs应用于从水环境中选择性识别PFOA和全氟辛烷磺酸（PFOS）。通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和微观电泳对MIPs进行了表征。此后，通过批量吸附实验评估了合成的MIPs对PFOA和PFOS的吸附容量和选择性。MIPs对PFOA和PFOS的最大吸附容量分别为6.42和6.27mg/g。还发现，在2.0-5.0的溶液pH范围内，吸附容量随pH升高保持恒定，而当pH进一步升高时则下降。最后，新型MIPs在经过五个吸附-解吸-吸附循环后可以重复使用，去除率没有显著下降，并且在实际湖水样品中对PFOA和PFOS的选择性去除具有有效性能。所有结果表明，二元功能单体MIPs在去除水环境中的PFOA和PFOS方面具有巨大潜力。
