碳纳米管分子印迹聚合膜修饰电极检测除草剂苄嘧磺隆研究.docVIP

碳纳米管分子印迹聚合膜修饰电极测定除草剂苄嘧磺隆张 进,(贵州师范学院 化学与生命科学学院, 贵阳 550018)摘 要：以除草剂苄嘧磺隆(BSM)为模板，邻氨基苯酚(oAP)为功能单体, 在修饰有多壁碳纳米管(MWCNTs) 的玻碳电极表面通过电化学聚合，制备了一种新颖的可对BSM进行选择性测定的分子印迹聚合物膜修饰电极。以K3Fe(CN)6为电化学探针，利用循环伏安法研究了印迹传感器的响应性能。结果表明：K3Fe(CN)6峰电流值与BSM浓度在.5~150 μmol/L范围内呈现较好的线性关系( =0.995)，检出限为0. μmol/L。传感器具有较短的响应时间(4 min)和较高的稳定性，可在与其结构相似的吡嘧磺隆等存在下选择性识别BSM。将该印迹膜传感器用于环境水样加标回收检测, ～关键词:多壁碳纳米管苄嘧磺隆Novel Electrochemical Sensor Modified with Multi-walled Carbon Nanotubes and Molecularly Imprinted Polymers Membrane for Determination of Herbicide Bensulfuronmethyl ZHANG Jin*, XU Hai-li, ZHOU Quan-bao, TIAN Lang (School of Chemistry and Life Science , Guizhou Normal College , Guiyang 550018, China) Abstract: A novel electrochemical sensor for bensulfuronmethyl (BSM) detection based on molecularly imprinted polymers membrane was constructed by electropolymerization of o-aminophenol (oAP) onto glassy carbon electrode surface coated with multi-walled carbon nanotubes (MWCNTs) in the presence of template BSM. The recognition performance of the imprinted sensor was investigated via measuring the cyclic voltammetry (CV) response of the oxidation-reduction probe, K3Fe(CN)6 on electrode. The results showed that the peak current of K3Fe(CN)6 decreased linearly in the concentration ranges of BSM from 0.5 to 150 μmol/L (r =0.995) with a detection limit of 0.17 μmol/L . The studied imprinted sensor exhibited rapid response (response time was closed to 4 min) and long-term stability. Additionally, The imprinted sensor demonstrated higher affinity for target BSM over competitive herbicide compounds. The proposed sensor was applied to BSM determination in environmental water samples with the recoveries from 95.3% to 97.2%. Key words: molecularly imprinted electrochemical sensor; electropolymerization film; multiwalled carbon nanotubes; bensulfuronmethyl 分子印迹电化学传感器(MIECS)因具有预定性好选择性高稳定性可批量生产等优势，在环境监测、药物分析和农药残留检测等领域展现了良好的应用前景[]。其存在的主要问题是传质和电荷传递速度慢从而使MIECS 的灵敏度不高电聚合形成的膜具有厚度及多孔性易于控制在电极表面附着被认为是MIECS传质速率的较好选择和制备MIECS敏感膜最有潜力的