摘要
以羧基化修饰的多壁碳纳米管为分散载体、丙烯酸(MAA)为功能单体、三羟甲基丙烷三甲基丙烯酸酯(TRIM)为交联剂,采用交联法在多壁碳纳米管表面合成对呋喃丹具有特异性识别的分子印迹聚合物(MWNTs-MIPs),并用扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外光谱仪(FT-IR)和热重分析仪(TGA)等对该印迹聚合物进行表征。结果表明,所制备的呋喃丹分子印迹聚合物可接枝于碳纳米管表面。聚合物的平衡吸附量可达113.6μg/mg,吸附效果优于其非印迹材料和普通分子印迹材料,且对呋喃丹的吸附效果具有特异性。在0.05~1 mg/kg添加水平内,韭菜中呋喃丹的回收率为89.7%~93.2%,优于相同质量的MIP柱。相对标准偏差(RSD)在3.2%~4.8%之间,检出限(LOD)为0.15 mg/kg。采用呋喃丹MWNTs-MIPs为填料的SPE法是测定韭菜中呋喃丹残留的一种很好的样品前处理方法。
A novel molecularly imprinted polymers(MIPs)based on multi-walled carbon nanotubes(MWNTs)was synthesized using carbofuran as template,methacrylic acid(MAA)as functional monomer,and trimethylolpropane trimethacrylate(TRIM)as cross-liking agent,and was confirmed using SEM,TEM,FT-IR and TGA.The carbofuran MIPs have been successfully grafted onto the surface of MWNTs as a thin layer with high stability.The results of absorption capacity test showed that the synthesized MWNTs-MIPs displayed good selective recognition to carbofuran with equilibrium adsorption of 113.6μg/mg.The MWNTs-MIPs showed superior absorption performance to MWNTs-NIPs and MIPs,and specific recognition to carbofuran.The recovery of carbofuran was within the range from 89.7%to 93.2%,when carbofuran was added to the leeks sample at the level of 0.05~1 mg/kg,higher than the MIP column.The RSD was within 3.2%~4.8%and the LOD was 0.15 mg/kg.The method using carbofuran MWNTs-MIPs as SPE filler is an applicable method for the determination of carbofuran residues in leeks.
作者
张文骥
耿广军
ZHANG Wen-ji;GENG Guang-jun(School of Forensic Sciences,Criminal Investigation Police University of China,Shenyang 110035,China;Traffic Police Detachment of Shenyang Public Security Bureau,Shenyang 110000,China)
出处
《化学试剂》
CAS
北大核心
2022年第5期703-709,共7页
Chemical Reagents
基金
2020辽宁省教育厅科学研究经费项目(ZGXJ2020012)
2020辽宁省法庭科学重点实验室资助课题项目(FTKX2020007)
辽宁网络安全执法协同创新中心资助项目(CSLE 2018012)。
关键词
呋喃丹
多壁碳纳米管
分子印迹
韭菜
残留
carbofuran
multi-walled carbon nanotubes
molecularly imprinting
leeks
residue
