Electrochemical oxidation for low concentration of aniline in neutral pH medium: Application to the removal of aniline based on the electrochemical polymerization on a carbon fiber
Electrochemical oxidation for low concentration of aniline in neutral pH medium: Application to the removal of aniline based on the electrochemical polymerization on a carbon fiber
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DOI：
10.1021/es040379f
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发表时间：
2005-05-15
影响因子：
11.4
通讯作者：
Tanaka, S
中科院分区：
文献类型：
--
作者：
Matsushita, M;Kuramitz, H;Tanaka, S
对环境造成严重污染的苯胺进行了电化学处理，从而将其从水溶液中去除。本文所演示的方法是基于电化学氧化在电极表面形成聚苯胺。首先，利用伏安法研究了苯胺在铂、玻碳（GC）和碳纤维（CF）电极上的电极行为。在铂电极上，苯胺在低浓度下不发生聚合。然而，即使在低浓度的中性pH溶液中，在GC和CF电极上也观察到苯胺的电聚合。苯胺的去除是用一个大表面积的CF束进行的。施加大于0.8 V的电位对苯胺有较高的去除率。虽然在电化学处理过程中观察到对苯醌作为副产物的产生，但施加低于0.9 V的电位抑制其产生。苯胺溶液处理后CF的循环伏安图和x射线光电子能谱表明CF表面存在聚合苯胺。估计电聚合苯胺的最大表面覆盖率约为1.49 X 10(-8) mol/cm(2)。此外，还演示了使用流动系统对苯胺的连续处理。
Aniline, which causes serious environmental problems, was electrochemically treated and thereby removed from aqueous solution. This method demonstrated herein is based on the formation of polyaniline at an electrode surface by electrochemical oxidation. Initially, the electrode behavior of aniline at several conditions was investigated on a platinum, glassy carbon (GC), and carbon fiber (CF) electrode using voltammetric techniques. On the platinum electrode, aniline did not polymerize at low concentrations. However, electropolymerization of aniline was observed on both the GC and CF electrodes even at low concentrations in neutral pH solutions. The removal of aniline was carried out using a CF bundle with a large surface area. High removal efficiency for aniline was obtained by applying potentials greater than 0.8 V. Although generation of p-benzoquinone as a byproduct was observed during electrochemical treatment, its generation was suppressed by applying a potential lower than 0.9 V. The cyclic voltammograms and X-ray photoelectron spectra of the CF after the treatment for aniline solution showed that polymeric aniline existed on the CF surface. The maximum surface coverage of electropolymerized aniline was estimated to be about 1.49 X 10(-8) mol/cm(2). Furthermore, the continuous treatment of aniline was demonstrated using a flow system.