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.
李美超
,
尤楠楠
,
马淳安
. 间氯苯甲酸在Pd/Ti电极上的电化学脱氯反应[J]. 化学学报, 2011
, 69(23)
: 2762
-2766
.
DOI: 10.6023/A1104131
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.
