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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
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作者单位
兰天宇,董泽刚,杜海军 1.贵州民族大学化学工程学院(民族医药学院)2.贵州民族大学生态环境工程学院 
基金项目: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)
中文摘要: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。
中文关键词: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
 
Electrochemical Determination of Sulfamethoxazole Based on Ag Nanoparticles/Multi walled Carbon Nanotubes Modified Electrode
Abstract: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.
Key Words:Ag nanoparticles  multi walled carbon nanotubes(MWCNTs)  differential pulse voltammetry(DPV)  sulfamethoxazole(SMZ)  electrochemical sensor
引用本文:兰天宇,董泽刚,杜海军.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[J].分析测试学报,2019,38(11):1321-1327.
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