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作 者:龙峰[1] 杨昌柱[1] 郑燕琼[1] 张敬东[2] 濮文虹[1]
机构地区:[1]华中科技大学环境科学与工程学院,武汉430074 [2]华中科技大学化学与化工学院,武汉430074
出 处:《理化检验(化学分册)》2009年第6期695-697,700,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
摘 要:将碳纳米管(CNT’s)分散于N,N-二甲基甲酰胺(DMF)溶液中,并滴涂在玻碳电极表面,制成碳纳米管修饰玻碳电极(CNT’S-GCE)。研究发现CNT’s—GCE对2,4-二硝基苯酚(2,4-DNP)有良好的电催化作用,得到了一对氧化还原峰和两个单独的还原峰。优化了测定参数,并在此基础上提出了一种直接测定2,4-二硝基苯酚的电分析方法。试验结果表明:在pH5.8的乙西酸-乙酸钠缓冲溶液中,2,4-二硝基苯酚的氧化峰电流与其浓度在2.5×10^-6~1.0×10^-4mol·L^-1范围内呈线性关系,检出限(3S/N)为3.7×10^-7mol·L^-1。Carbon nanotubes (CNT' s) were dispersed in DMF solution, and the mixture obtained was dropped on the surface of glassy carbon electrode (GCE) to prepare CNT's modified C-CE (CNT's-GCE). It was shown that significant catalytic action of CNT's-GCE was observed on the reaction of 2,4-Dirfitrophenol (2,4-DNP) at the electrode, giving a pair of oxidation peak and reduction peak, as well as two individual reduction peaks. The reaction conditions were studied and optimized, and an electrochemical method was proposed for the direct determination of 2,4-DNP. Linear relationship between the oxidation peak current and concentration of 2,4-DNP was obtained in the range from 2. 5×10^-6 to 1. 0 ×10^-4mol·L^-1, with the detection limit (3S/N) of 3. 7×10^-7mol·L^-1.
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