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(jī)制,結(jié)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(yàn)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(yīng)60min,對硝基酚去除率為89.7%,而常規(guī)微電解在最佳條件下對硝基酚的去除率僅為53.8%.值得關(guān)注的是EDTA不僅提高了對硝基酚的去除率,而且拓寬了微電解體系對pH值的適應(yīng)范圍,在中性條件下微電解/EDTA體系對硝基酚的去除率達(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),通過對降解產(chǎn)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(xué)環(huán)境學(xué)院,污染控制與資源化研究國家重點(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： X13  關(guān)鍵詞： 微電解    EDTA    影響    對硝基酚.    Keywords： micro-electrolysis    EDTA    effect    4-nitrophenol.   

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