基于纳米银/多壁碳纳米管修饰电极的电化学法测定磺胺甲■唑  

Electrochemical Determination of Sulfamethoxazole Based on Ag Nanoparticles/Multi-walled Carbon Nanotubes Modified Electrode

作　　者：兰天宇 董泽刚 杜海军 LAN Tian-yu;DONG Ze-gang;DU Hai-jun(School of Chemical Engineering(School of Chinese Pharmacy),Guizhou Minzu University,Guiyang 550025,China;College of Eco-environmental Engineering,Guizhou Minzu University,Guiyang 550025,China)

机构地区：[1]贵州民族大学化学工程学院(民族医药学院),贵州贵阳550025 [2]贵州民族大学生态环境工程学院,贵州贵阳550025

出　　处：《分析测试学报》2019年第11期1321-1327,共7页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(81860701);贵州省留学人员科技活动择优资助项目(黔人项目资助合同(2018)008号);贵州省普通高等学校“绿色化学与资源环境创新团队”项目(黔教合人才团队字[2015]62)

摘　　要：以表面处理多壁碳纳米管(MWCNTs)和硝酸银为原料,利用硼氢化钠还原法制备了纳米银/多壁碳纳米管复合材料(AgNPs/MWCNTs),并通过紫外-可见吸收光谱、红外光谱、拉曼光谱和X射线衍射进行表征。采用滴涂法将该纳米复合材料修饰至玻碳电极表面,得到纳米银/多壁碳纳米管修饰电极(AgNPs/MWCNTs/GCE)。以AgNPs/MWCNTs/GCE为工作电极,研究了缓冲溶液、pH值、支持电解质和扫描速度对磺胺甲■唑(SMZ)电化学反应活性的影响。结果表明,与多壁碳纳米管、纳米银单独修饰电极相比,该纳米复合材料修饰电极对SMZ显示了更高的电催化活性。优化条件下,SMZ浓度在3.0×10^-7~5.0×10^-5 mol/L范围内与峰电流呈线性关系,检出限(S/N=3)为6.4×10^-8 mol/L。该方法操作简单、快速,可用于河水样品中SMZ的检测。In this work,Ag nanoparticles/multi-walled carbon nanotubes(AgNPs/MWCNTs)composites were synthesized with multi-walled carbon nanotubes(MWCNTs)and silver nitrate as raw materials,and sodium borohydride as reduction agent,and the AgNPs/MWCNTs composites were characterized by ultraviolet-visible absorption spectroscopy,infrared spectroscopy,Raman spectroscopy and X-ray diffraction.Based on this,an Ag nanoparticles/multi-walled carbon nanotubes modified electrode(AgNPs/MWCNTs/GCE)was prepared by immobilizing AgNPs/MWCNTs onto the surface of glassy carbon electrode.Effects of buffer solution,pH value,supporting electrolyte and scanning rate on electrochemical reactivity of the AgNPs/MWCNTs/GCE were investigated.Results showed that the nanocomposite modified electrode had a better electrocatalytic activity for sulfamethoxazole(SMZ),compared with MWCNTs or Ag nanoparticles modified electrode.Under the optimized conditions,there was a linear relationship between SMZ and peak current in the range of 3.0×10^-7-5.0×10^-5 mol/L,and the limit of detection(S/N=3)was 6.4×10^-8 mol/L.The method is simple and rapid,and could be used for the detection of SMZ in river samples.

关 键 词：纳米银 多壁碳纳米管(MWCNTs) 差分脉冲伏安法(DPV) 磺胺甲■唑(SMZ) 电化学传感 

分 类 号：O657.1[理学—分析化学] R978.1[理学—化学]