摘要
利用气相色谱-质谱探讨了丙烯腈废水中有机物的高压放电法降解机理.结果表明:丙烯腈的氰基首先被破坏生成丙烯酸,丙烯酸进一步被氧化生成乙酸,乙酸降解为甲酸,最后生成CO2.丁二腈首先降解为丁二酸,丁二酸再生成丙酸,并逐步降解为乙酸、甲酸,最后生成CO2.二氰乙基胺在降解过程中依次生成丙腈、丙酸、乙酸和甲酸,最后生成CO2.丙烯腈的降解过程符合拟一级反应过程;有机氰降解快于羧酸,丙烯腈降解快于丙烯酸,乙腈降解快于乙酸.就这几种有机物及其降解中间产物而言,甲酸的降解速率最快;4种有机物的降解率顺序为:丙烯腈>乙腈>丁二腈>β,β′-二氰乙基胺.
High potential discharge degradation mechanism of major organic compounds in acetonitrile wastewater was investigated by means of gas chromatography-mass spectrometry.It was found that the cyano group of acrylonitrile was initially decomposed to generate acrylic acid which was further oxidized to form acetic acid.Acetic acid was then decomposed to generate formic acid which was finally degraded into CO2.The main degradation route of butanedinitrile is similar to that of acrylonitrile.Namely,it was successively decomposed to generate succinic acid,propionic acid,acetic acid,formic acid and CO2.Besides,bis-（β-cyanoethyl）-amine was degraded to generate n-propionitrile,propionic acid,acetic acid,formic acid,finally forming CO2.At the same time,the cyanic compounds were degraded faster than carboxylic acid.For example,Acrylonitrile was degraded faster than acrylic acid,and acetonitrile was degraded faster than acetic acid.Of the tested organic compounds and their degraded intermediates,formic acid had the fast degradation rate.The degradation rate of the four major compounds is ranked as acrylonitrile acetonitrile butanedinitrile bis-（β-cyanoethyl） amine.
出处
《化学研究》
CAS
2011年第2期30-35,共6页
Chemical Research
关键词
丙烯腈
废水
有机物
高压放电法
降解机理
acetonitrile
wastewater
organic compound
high potential discharge route
degradation mechanism
