高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

离子液体BMIMBF4-H2O中邻氯硝基苯的电化学还原性能

柳英姿, 肖丽平, 张凯, 赵淑凤, 张静波, 陆嘉星   

  1. 上海市绿色化学与化工过程绿色化重点实验室, 华东师范大学化学系, 上海 200062
  • 收稿日期:2007-12-24 修回日期:1900-01-01 出版日期:2008-10-10 发布日期:2008-10-10
  • 通讯作者: 陆嘉星

Electrochemical Reduction Characteristics of 2-Chloronitrobenzene in Ionic Liquid BMIMBF4-H2O

LIU Ying-Zi, XIAO Li-Ping, ZHANG Kai, ZHAO Shu-Feng, ZHANG Jing-Bo, LU Jia-Xing*   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, China
  • Received:2007-12-24 Revised:1900-01-01 Online:2008-10-10 Published:2008-10-10
  • Contact: LU Jia-Xing

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摘要：

以离子液体BMIMBF4为溶剂和支持电解质, H2O为氢源, 采用循环伏安法、交流阻抗法研究邻氯硝基苯在Cu微盘电极上的电化学还原性能. 研究结果表明, 邻氯硝基苯在离子液体中是一个受扩散控制的反应; 由不同极化电位下的电化学阻抗谱可看出, 在高频区主要是以电化学极化控制为主, 在低频区出现直线表明电化学反应受反应物质扩散控制, 表明该电化学反应是受电化学极化和反应物扩散联合控制, 随电位负移, 电极表面电荷传质的容抗弧逐渐减小, 反应更易进行; 在电解合成实验中, 在最优条件下(E=-0.9 V, c=74.4 mmol/L, Q=517.6 C)得到的产率(86.2%)最高, 比同类反应中电化学合成文献报道值高.

关键词:

离子液体, 循环伏安, 交流阻抗, 电化学阻抗谱, 邻氯硝基苯

Abstract: The electrochemical reduction of 2-chloronitrobenzene was investigated in the room temperature ionic liquid 1-n-butyl-3-methylimidazolium tetrafluorobrate(BMIMBF4) on a Cu disc microelectrode by using cyclic voltammetry and AC(Alternating Current) impedance method, with some water as the resource of hydrogen. The results show that the electroreduction of 2-chloronitrobenzene is a reaction controlled by diffusion. The AC impedance plots at different potentials show that the reaction is controlled by both electrochemical polarization and diffusion processes, which appears at higher and lower frequencies, respectively. With the increase of applied potentials, the semi-circles appeared at higher frequencies and became smaller and smaller, and it illustrates that the reaction is carried out easier. The influence of electrolysis potential, the concentration of 2-chloronitrobenzene and the passed charge were studied to optimize the electrolytic conditions, with the maximal yield to be 86.2%.

Key words: Ionic liquid, Cyclic voltammetry, AC impedance, Electrochemical impedance spectrscopy, 2-Chloronitrobenzene

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