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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (16): 1929-1935. 上一篇    下一篇

研究论文

微波-伏安法协同体系应用于水体中痕量Pb(II)的检测研究

许贺*,1，杨萍1，郑巧利1，柳建设1，金利通2   

  1. (1东华大学环境科学与工程学院 上海 201620)
    (2华东师范大学化学系 上海 200062)
  • 投稿日期:2010-09-20 修回日期:2011-02-16 发布日期:2011-04-20
  • 通讯作者: 许贺 E-mail:hexu@dhu.edu.cn
  • 基金资助:

    国家自然科学基金青年基金;东华大学校基金

Study on Microwave Irradiated-Voltammetry Synergetic System for the Detection of Trace Pb(II) in Water

Xu He*,1 Yang Ping1 Zheng Qiaoli1 Liu Jianshe1 Jin Litong2   

  1. (1 School of Environmental Science and Engineering, Donghua University, Shanghai 201620)
    (2 Department of Chemistry, East China Normal University, Shanghai 200062)
  • Received:2010-09-20 Revised:2011-02-16 Published:2011-04-20
  • Contact: He Xu E-mail:hexu@dhu.edu.cn

PDF

894

被引次数

2

采用金纳米粒子修饰铂微电极(Au-NPs/Pt)为“探针”, 研究其在微波-伏安法协同体系下检测Pb(II)的电化学性质. 微波辐射的“自聚焦”作用导致微电极/电解质扩散层形成“热点效应”、温度梯度和对流传质. 采用单电子氧化还原 /K2SO4 (pH 3)体系对电极/电解质界面温度进行校正. 研究结果发现, 低功率微波对Au-NPs/Pt微电极的电化学性质影响较为明显. 采用微波-伏安法检测Pb(II)的溶出电流极大增强, 比传统方法增大近10倍. 常规条件下易于阻塞电极的表面活性剂在微波-伏安协同体系中对Pb(II)峰电流的影响也大大减小.

关键词: 微波辐射, 伏安法, 热点效应, 铅

Gold nanoparticles-modified platinum (Au-NPs/Pt) microelectrode is used as a “probe”, and applied to detect Pb(II) in the presence of microwave irradiated-voltammetry synergetic system. Self-focusing of the microwave radiation creates a “hot spot” at the electrode/electrolyte interface within the diffusion layer of the electrode with an inverted thermal gradient and convective flow. The temperature at the electrode/solution interface is calibrated with reversible one electron redox system in aqueous K2SO4 solution (pH 3). The results indicate that the electrochemical performance at the Au-NPs/Pt microelectrode is significantly affected under the low microwave power. The Pb(II) stripping current at the (Au-NPs/Pt) microelectrode is shown to be strongly enhanced by microwave irradiated-voltammetry, which triggers approximately 10-times Pb(II) current response compared to those expected values in conventional conditions. The effect of surfactant, which blocks the electrochemical Pb(II) signal under conventional conditions, is remarkably reduced under the microwave radiation of voltammetry process.

Key words: microwave irradiation, voltammetry, “hot spot” effect, lead