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pH值对零价铁降解4-氯硝基苯的影响

发表时间:2010-12-31  浏览量:1655  下载量:491
全部作者: 王璐璐,李燕
作者单位: 中国矿业大学环境与测绘学院,江苏省资源环境信息工程重点实验室
摘 要: 考察pH值对零价铁(Fe0)降解4-氯硝基苯(4-ClNB)的效果。结果表明:4-ClNB还原转化速率随pH值增大而明显减小。pH值越低,4-ClNB的降解速率越快。初始pH值分别为3和5时,4-ClNB还原率达到了100%;pH值为7时,4-ClNB还原率也达到90%左右;而pH值为9和12时,4-ClNB还原率仅为83.7%和33.3%.对不同pH值下的还原过程监测pH值变化,发现pH值小于7时,反应过程pH值逐渐升高,而pH值大于7时,pH值无明显变化。最后分析Fe0降解4-ClNB的过程,其最终产物为4-氯苯胺,无还原脱氯活性。
关 键 词: 环境化学;零价铁;4-氯硝基苯;pH值;机理
Title: Effect of pH value on the process of zero-valent iron degradation 4-Nitrochlorobenzene
Author: WANG Lulu, LI Yan
Organization: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Jiangsu Key Laboratory of Resources and Environmental Information Engineering
Abstract: A test was conducted to examine the effect of pH value on the degradation of 4-Nitrochlorobenzene (4-ClNB) by zero-valent iron (Fe0). The results showed that, the reductive transformation rate of 4-ClNB significantly decreased with increasing pH. The lower the pH value was, the faster the degradation rate of 4-ClNB was. The initial pH value was 3 and 5, the reduction rate of 4-ClNB reached 100%; pH value was 7, the reduction rate of 4-ClNB was about 90%, while the pH value was 9 and 12, the reduction rate of 4-ClNB was only 83.7% and 33.3%. pH value change of the reduction process was detected under different pH. It was found that pH value of the reaction process gradually increased while pH value was less than 7, and pH had no significant change when pH was greater than 7. The paper analyzed the reduction process for 4-ClNB with Fe0 briefly. The final reduction product of 4-Nitrochlorobenzene was 4-Chloroaniline, no dechlorination activity.
Key words: environmental chemistry; zero-valent iron; 4-Nitrochlorobenzene; pH value; mechanism
发表期数: 2010年12月第24期
引用格式: 王璐璐,李燕. pH值对零价铁降解4-氯硝基苯的影响[J]. 中国科技论文在线精品论文,2010,3(24):2470-2474.
 
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