摘要
目的探讨不同物质结构的难生物降解芳香化合物的电催化降解规律.方法依据电化学高级氧化的机理,通过静态试验,分别对酚类和胺类芳香污染物进行电化学氧化降解,分析不同取代基对降解效果的影响.结果电催化氧化技术可有效处理水中的芳香化合物,处理2h,苯酚、苯胺和甲苯胺接近完全去除,对氯苯酚和对氯苯胺的去除率超过90%,对硝基苯酚和2,4-二氯酚的去除率也达到70%左右.甲苯胺、苯胺、苯酚和对氯苯胺废水的COD去除率超过50%,对氯苯酚废水的COD去除率为40%,对硝基苯酚和2,4-二氯酚的COD去除率很低.结论苯环上取代基对有机物的电催化降解活性有很大影响,带有供电子取代基团的芳香化合物的电催化降解速率比带有吸电子取代基团的芳香化合物的电催化降解速率快,取代基的数量越多影响越大.
The paper aims to probe into the discipline of the electricity catalytic degradation of difficult biological catabolic aromatic compounds of different physical structure.Based on the electrochemical senior oxidation mechanism,by static tests,the electrocatalytic degradation of phenols and amines are carried out respectively and the different substituent effects on degradation are analyzed.Results show that the efficiency on treatment of the aromatic compounds by electrochemical oxidation is obvious.The ring substituents signif-icantly influence the electrocatalytic reactivity of the aromatic compounds,the relationship between structure and electrocatalytic reactivity is interrupted by Hammett constant.The electrocatalytic degradation rate of substituted aromatic compound with electron-doing groups is higher than the one with electron-withdrawing groups.With it,2 h,phenol,aniline and toluidine can be nearly completely removed,and removal rate of chloroaniline and chlorophenol can be more than 90%,also,removal rate of nitrophenol and 2,4-dichloro-phenol can be near to 70%.COD removal rate of toluidine,aniline,phenol and chloroaniline can be more than 50%,COD removal rate of chlorophenol is 40%,but COD removal rate of nitrophenol and 2,4-dichlo-rophenol are much lower.The conclusion is drawn that the bencene′s substituent has great infucence on the electro catalysis.And the catalysis rate of aromatic compourd with eletron-doing groups is faster than that of aromatic compound with electron-withdrawing groups.The more the suistituent is the greater the influence becomes.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2010年第3期538-541,共4页
Journal of Shenyang Jianzhu University：Natural Science
基金
住房和城乡建设部科技攻关项目(2008-K7-25)
关键词
芳香化合物
物质结构
电催化
取代基
降解速率
aromatic compound
matter structure
electro catalysis
substituent
degradation rate
