以乙烯基改性的多壁碳纳米管(MWNTs)为固相载体基质,苯唑西林(OXA)为模板分子,丙烯酰胺(AM)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,乙醇为溶剂,采用沉淀聚合法合成了印迹聚合物.通过紫外光谱、傅里叶红外光谱、热重分析、扫描电子显微镜和氮吸附实验进行表征,并通过动力学吸附和选择性吸附实验研究其吸附性能.结果表明,MWNTs@SiO2@MIPs的吸附量高于MIPs、MWNTs@SiO2@NIPs,最高能达到92 μmol/g,选择性吸附后分配系数为20.36,对苯唑西林有更好的结合能力,印迹效率更高.产品在短期内可循环使用,具有再生性.
In this work,a novel strategy for the imprinting of oxacillin molecule on the surface of multiwalled carbon nanotubes (MWNT) was proposed.In brief,MWNTs were firstly coated with a layer of vinyl group modified silica,followed by a precipitation polymerization with oxacillin as the template,ethylene glycol dime thacrylate (EGDMA) as the crosslinker,ethyl alcohol as solvent and 2,2-azobisisobutyronitrile (AIBN) as the initiator,respectively.The performances of MWNTs@SiO2@MIPs were characterized by UV,FT-IR,TG and SEM.The properties involving adsorption dynamics and selective recognition capacity were demonstrated.As a result,MWNTs@SiO2@MIPs show a higher adsorption capacity than MIPs and MWNTs@SiO2@NIPs.The maximum adsorption amount is up to 92μmol/g and the distribution coefficient is 20.36.Furthermore,MWNTs @SiO2@MIPs show a better recognition ability to oxacillin and a higher imprinting efficiency.The products with regeneration can be recycled in a short term.
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