贵金属氧化物涂层电极催化降解苯胺

Aniline degradation by electrocatalytic method on a noble metallic oxide coating electrode

采用贵金属氧化物涂层电极对不同体系苯胺溶液进行了电化学催化氧化研究.结果表明:中性与碱性体系的降解过程类似,按苯胺—苯醌—马来酸的过程氧化降解,但由于碱性体系易于析氧而降低了降解效率;酸性体系生成聚苯胺物质增加了降解难度,降解效率最低.分析表明,苯胺在电化学催化氧化时最易形成对位和间位中间产物,而其对位和间位中间产物又难于降解,这是苯胺难于降解的根本原因.提出了在电解苯胺溶液过程中增加物理过滤步骤的新工艺.该工艺不仅能够有效地降解苯胺,化学需氧量(CODCr)去除率达到82%,且提高降解速度,降低能耗.

Electrochemical oxidation reactions of aniline in different systems were studied on a noble metallic oxide coating electrode, The results indicated that the degradation processes of aniline in neutral and alkaline solutions were similar, both with the appearance of the intermediates of benzoquinone and tartaric acid in successive, however, the degradation efficiency decreased in alkaline solution due to oxygen evolution, In an acidity system the difficulty of degradation increased because polyaniline appeared, and the degradation efficiency was the lowest, Para and meta intermediates, which were difficult to be degraded, formed during the electrochemical oxidation process and this was the major reason for the difficult degradation of aniline. A new technique was proposed to remove more intermediates of aniline, and the results indicated that this technique could not only effectively degrade waste water with aniline for the removal of chemical oxygen demand （CODcr） up to 82%, but also increased electric current efficiency and reduced energy consumption.