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EDTA對(duì)微電解體系降解對(duì)硝基酚的影響
摘要: 考察了EDTA對(duì)微電解體系降解對(duì)硝基酚的影響及作用機(jī)制,結(jié)果表明,EDTA能夠提高微電解處理對(duì)硝基酚的效果;單因素試驗(yàn)法確定了微電解/EDTA體系處理1000mg·l~(-1)對(duì)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(yīng)60min,對(duì)硝基酚去除率為89.7%,而常規(guī)微電解在最佳條件下對(duì)硝基酚的去除率僅為53.8%.值得關(guān)注的是EDTA不僅提高了對(duì)硝基酚的去除率,而且拓寬了微電解體系對(duì)pH值的適應(yīng)范圍,在中性條件下微電解/EDTA體系對(duì)硝基酚的去除率達(dá)到了63.5%,而相同條件下傳統(tǒng)微電解法僅為19.5%.同時(shí),通過對(duì)降解產(chǎn)物的鑒定,分析了對(duì)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(xué)環(huán)境學(xué)院,污染控制與資源化研究國(guó)家重點(diǎn)實(shí)驗(yàn)室,水處理與水環(huán)境修復(fù)教育部工程研究中心,南京,210093 期 刊: 環(huán)境化學(xué) ISTICPKU Journal: ENVIRONMENTAL CHEMISTRY 年,卷(期): 2009, 28(6) 分類號(hào): X13 關(guān)鍵詞: 微電解 EDTA 影響 對(duì)硝基酚. Keywords: micro-electrolysis EDTA effect 4-nitrophenol.【EDTA對(duì)微電解體系降解對(duì)硝基酚的影響】相關(guān)文章:
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