吡虫啉介孔表面分子印迹聚合物的制备及其吸附性能研究

Study of preparation and adsorption properties of imidacloprid mesoporous surface molecularly imprinted polymer

以吡虫啉为模板分子,甲基丙烯酸(MAA)为功能单体,偶氮二异丁腈(AIBN)为引发剂,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,一步法快速合成了吡虫啉介孔表面分子印迹聚合物(MIP)。采用扫描电镜(SEM)、透射电镜(TEM)、傅立叶变换红外光谱(FT-IR)和氮气吸附-解吸等温线对制备的MIP进行表征,对吸附条件进行了优化。在吡虫啉质量浓度为100μg/mL时,MIP达到吸附饱和且时间短于相应的非印迹聚合物(NIP),其饱和吸附值为3.628 mg/g,印迹因子为1.27,说明介孔结构和表面印迹提高了吡虫啉在吸附过程中的传质速率,进而提高吸附容量。在相同条件下,MIP对吡虫啉的吸附容量高于啶虫脒、噻虫啉和噻虫嗪,表明MIP具有较好的特异性识别能力。该吡虫啉介孔MIP制备简单且所需时间短,是样品预处理和快速检测领域的潜在材料。

Imidacloprid mesoporous surface molecularly imprinted polymer(MIP)was rapidly synthesized by onestep method,with imidacloprid as template molecule,methacrylic acid(MAA)as functional monomer,azodiisobutyronitrile(AIBN)as initiator and ethylene glycol dimethacrylate(EGDMA)as crosslinker.The characterization of MIP was completed by SEM,TEM,FT-IR,and nitrogen adsorption-desorption isotherms.The adsorption conditions were optimized.At the imidacloprid concentration of 100μg/mL,MIP reached adsorption saturation and the adsorption time was shorter than that of the corresponding non-imprinted polymer(NIP),with the saturated adsorption value of 3.628 mg/g,and the imprinting factor of 1.27,indicating that the mesoporous structure and surface imprinting improved the mass transfer rate of imidacloprid in the adsorption process,so as to improving the adsorption capacity.In addition,under the same conditions,the adsorption capacity of MIP for imidacloprid was higher than acetamiprid,thiacloprid and thiamethoxam,indicating that MIP had better specific recognition ability.The imidacloprid mesoporous surface MIP can be prepared simply and rapidly,which may be a potential material in the field of sample pretreatment and rapid detection.