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EDTA對微電解體系降解對硝基酚的影響
摘要： 考察了EDTA對微電解體系降解對硝基酚的影響及作用機制,結果表明,EDTA能夠提高微電解處理對硝基酚的效果;單因素試驗法確定了微電解/EDTA體系處理1000mg·l~(-1)對硝基酚的最佳條件:鐵屑量120g·l~(-1),碳量20g·l~(-1),pH值為3,EDTA濃度1mmol·l~(-1).在此條件反應60min,對硝基酚去除率為89.7%,而常規微電解在最佳條件下對硝基酚的去除率僅為53.8%.值得關注的是EDTA不僅提高了對硝基酚的去除率,而且拓寬了微電解體系對pH值的適應范圍,在中性條件下微電解/EDTA體系對硝基酚的去除率達到了63.5%,而相同條件下傳統微電解法僅為19.5%.同時,通過對降解產物的鑒定,分析了對硝基酚在微電解/EDTA體系的降解途徑. 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 劉波 汪琦 閆懂懂 吳文菲 陳澤智 LI Song LIU Bo WANG Qi YAN Dong-dong WU Wen-fei CHEN Ze-zhi 作者單位： 南京大學環境學院,污染控制與資源化研究國家重點實驗室,水處理與水環境修復教育部工程研究中心,南京,210093 期 刊： 環境化學 ISTICPKU Journal： ENVIRONMENTAL CHEMISTRY 年，卷(期)： 2009, 28(6) 分類號： X13 關鍵詞： 微電解 EDTA 影響 對硝基酚. Keywords： micro-electrolysis EDTA effect 4-nitrophenol.【EDTA對微電解體系降解對硝基酚的影響】相關文章：
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