| 百草枯在碳纳米管与离子液体复合修饰电极上的电化学行为及测定 |
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| 引用本文： | 范向明,何晓英,张艳,李明齐.百草枯在碳纳米管与离子液体复合修饰电极上的电化学行为及测定[J].分析测试学报,2010,29(4). |
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| 作者姓名： | 范向明 何晓英 张艳 李明齐 |
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| 作者单位： | 西华师范大学,化学化工学院,电化学研究所,四川,南充,637002 |
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| 基金项目： | 四川省教育厅资助项目 |
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| 摘 要： | 制备了碳纳米管(MWCNTs)和疏水性离子液体1-丁基-3-甲基咪唑六氟磷酸盐(BMIMPF6)复合修饰电极(MWCNTs-BMIMPF6/GCE),并采用红外光谱(IR)分别对MWCNTs、BMIMPF6及MWCNTs-BMIMPF6进行了表征。运用循环伏安法研究了百草枯(PQ)在该修饰电极上的电化学行为。结果表明,在pH7.0的PBS缓冲溶液中,PQ在MWCNTs-BMIMPF6/GCE上出现2对明显的氧化还原峰,在20~200 mV/s扫描速率范围内,其氧化还原峰电流均与扫描速率平方根(v1/2)呈线性关系,表明该电极过程受扩散控制。计算了电极过程的部分动力学参数:电极有效面积A=0.156 4 cm2,百草枯在pH7.0的PBS缓冲液中的扩散系数D=7.0×10-5cm2/s。优化了方波溶出伏安法(SWSV)的实验参数,发现峰电流Ipa1与PQ浓度在7.729×10-7~9.660×10-5mol/L范围内呈线性关系,检出限为1.576×10-7mol/L。采用该方法对实际水样进行检测,增敏回收率为93%~104%。
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| 关 键 词： | 疏水性离子液体 碳纳米管 百草枯 电化学行为 方波溶出伏安 |
Electrochemical Behavior and Determination of Paraquat on the Glassy Carbon Electrode Modified by Carbon Nanotubes and Ionic Liquid |
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| FAN Xiang-ming,HE Xiao-ying,ZHANG Yan,LI Ming-qi.Electrochemical Behavior and Determination of Paraquat on the Glassy Carbon Electrode Modified by Carbon Nanotubes and Ionic Liquid[J].Journal of Instrumental Analysis,2010,29(4). |
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| Authors: | FAN Xiang-ming HE Xiao-ying ZHANG Yan LI Ming-qi |
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| Institution: | FAN Xiang-ming,HE Xiao-ying,ZHANG Yan,LI Ming-qi(Electrochemical Research Institute,College of Chemistry , Chemical Engineering,China West Normal University,Nanchong 637002,China) |
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| Abstract: | A carbon nanotubes and 1-n-butyl-3-methylimidazolium hexafluorophosphate ionic liquids modified electrode(MWCNTs-BMIMPF6/GCE) was prepared.The characteristic of modified materials including,MWCNTs,BMIMPF6 and MWCNTs-BMIMPF6 was characterized by infrared spectroscopy(IR) and the electrochemical behavior of paraquat(PQ) was studied by cyclic voltammetric(CV) method.Two pairs of redox peaks of PQ were observed on the MWCNTs-BMIMPF6/GCE in pH 7.0 PBS buffer solution.The peak currents were linear to the square r... |
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| Keywords: | hydrophobic ionic liquids carbon nanotubes paraquat electrochemical behavior square-wave stripping voltammetry |
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