EDTA对微电解体系降解对硝基酚的影响  

THE EFFECT OF EDTA ON THE DEGRADATION OF 4-NITROPHENOL IN MICRO-ELECTROLYSIS SYSTEM

作　　者：李松[1] 刘波[1] 汪琦[1] 闫懂懂[1] 吴文菲[1] 陈泽智[1] 

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,水处理与水环境修复教育部工程研究中心,南京210093

出　　处：《环境化学》2009年第6期783-787,共5页Environmental Chemistry

基　　金：水处理与水环境教育部工程研究中心开放课题基金项目(WTWER0719)

摘　　要：考察了EDTA对微电解体系降解对硝基酚的影响及作用机制,结果表明,EDTA能够提高微电解处理对硝基酚的效果;单因素试验法确定了微电解/EDTA体系处理1000mg.l-1对硝基酚的最佳条件:铁屑量120g.l-1,碳量20g.l-1,pH值为3,EDTA浓度1mmol.l-1.在此条件反应60min,对硝基酚去除率为89.7%,而常规微电解在最佳条件下对硝基酚的去除率仅为53.8%.值得关注的是EDTA不仅提高了对硝基酚的去除率,而且拓宽了微电解体系对pH值的适应范围,在中性条件下微电解/EDTA体系对硝基酚的去除率达到了63.5%,而相同条件下传统微电解法仅为19.5%.同时,通过对降解产物的鉴定,分析了对硝基酚在微电解/EDTA体系的降解途径.The main disadvantage of conventional micro-electrolysis treatment is that the degradation efficiency is not very high. To solve this problem, the effect of EDTA enhancement on the degradation of 4-NP in the micro-electrolysis/EDTA system was investigated, during which EDTA and 4-NP was degraded by the micro-electrolysis system. The results showed that EDTA could improve the removal rate of 4-NP. The operating conditions for degradation of 4-NP （ 1000 mg · l^-1 ） in the micro-electrolysis/EDTA system were optimized by individual factor experiments and they were as following： C（Fe） = 120 mg · l^-1, C（C） =20 mg · l^-1, C（EIYFA） = 1 mmol · 1^-1, pH = 3. Under this condition, 4-NP removal rates reached 89.7% within 60 min, while the removal rate of 4-NP was only achieved 53.8% by the convention micro-electrolysis treatment. The most deserves attention was that micro-electrolysis/EDTA system also displayed a reasonable good degradation activity in a neutral condition. The removal of 4-NP in micro-electrolysis/EDTA system was over 63.5% at pH of 7, while it was only 19.5% in micro-electrolysis system. The degradation products of 4-NP were identified with GC/MS methods and the degradation pathways of 4-NP were discussed.

关 键 词：微电解 EDTA 影响 对硝基酚 

分 类 号：X703[环境科学与工程—环境工程] O625.613[理学—有机化学]