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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (23): 2762-2766.DOI: 10.6023/A1104131 上一篇    下一篇

研究论文

间氯苯甲酸在Pd/Ti电极上的电化学脱氯反应

李美超, 尤楠楠, 马淳安*   

  1. (浙江工业大学分析测试中心 化学工程与材料学院 绿色化学合成技术国家重点实验室培育基地 杭州 310032)
  • 投稿日期:2011-04-13 修回日期:2011-06-18 发布日期:2011-08-18
  • 通讯作者: 马淳安 E-mail:science@zjut.edu.cn

Studies on Electrochemical Dechlorination Reaction of 3-Chlorobenzoic Acid on Pd/Ti Electrode

LI Mei-Chao, YOU Nan-Nan, MA Chun-An   

  1. (Research Center of Analysis and Measurement, College of Chemical Engineering and Materials Science, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032)
  • Received:2011-04-13 Revised:2011-06-18 Published:2011-08-18

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1405

被引次数

6

以Ti为基底电极, 在PdCl2溶液中电沉积制备了Pd/Ti电极, 采用SEM和XPS进行表征. 采用循环伏安法研究了Cu, Ag, Ti和Pd/Ti电极对间氯苯甲酸(3-CBA)的电还原特性, 与Cu, Ag和Ti电极相比, Pd/Ti电极对3-CBA有较好的电化学还原活性. 同时采用电化学原位红外反射光谱对3-CBA在Pd/Ti电极上的电还原反应机理进行了系统分析, 结果表明3-CBA在Pd/Ti电极上的电化学脱氯反应是一个脱氯加氢过程, 3-CBA首先得到一个电子形成阴离子自由基中间体, 随后释放一个氯离子, 产生苯甲酸盐的自由基, 最后该自由基得到一个电子并夺取一个氢质子, 在电极表面脱去氯得到最终产物苯甲酸.

关键词: 间氯苯甲酸, Pd/Ti电极, 电化学脱氯, 原位红外光谱

Pd/Ti electrode was prepared on Ti substrate electrode using cyclic voltammetry in hydrochloric acid containing PdCl2. The electrocatalytic performance toward electrochemical reduction reactivity of 3-chlorobenzoic acid (3-CBA) on Cu, Ag, Ti and Pd/Ti electrodes was investigated by cyclic voltammetry. Compared with Cu, Ag and Ti electrodes, Pd/Ti electrode exhibited a high electrochemical activity for the reduction process of 3-CBA in NaOH solution. In situ FTIR was applied to analyze the electrochemical dechlorination mechanism of 3-CBA systematically. The results showed that 3-CBA was electroreduced to its free radical ion after receiving an electron. Then the 3-CBA free radical took off a chloride ion and produced the benzoic acid free radical. After receiving another electron and a proton, the final product benzoic acid was obtained.

Key words: 3-chlorobenzoic acid, Pd/Ti electrode, electrochemical dechlorination, in situ FTIR

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