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EDTA对微电解体系降解对硝基酚的影响
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. Abstract： 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 g ·~(-1), C(C) =20 g·l~(-1), C(EDTA) =1 mmol · l~(-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. 作 者： 李松 刘波 汪琦 闫懂懂 吴文菲 陈泽智 LI Song LIU Bo WANG Qi YAN Dong-dong WU Wen-fei CHEN Ze-zhi 作者单位： 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 期 刊： 环境化学 ISTICPKU Journal： ENVIRONMENTAL CHEMISTRY 年，卷(期)： 2009, 28(6) 分类号： X13 关键词： 微电解 EDTA 影响 对硝基酚. Keywords： micro-electrolysis EDTA effect 4-nitrophenol.【EDTA对微电解体系降解对硝基酚的影响】相关文章：
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