pH对零价铁降解4-氯硝基苯的影响
Effect of pH on the process of zero-valent iron degradation 4-Nitrochlorobenzene
考察pH对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增大而明显减小。pH值越低,4-ClNB的降解速率越快。初始pH值为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值下的还原过程检测pH值变化,发现pH值小于7时,反应过程pH值逐渐升高,而pH大于7时,pH值无明显变化。最后分析了Fe0降解4-氯硝基苯的过程,其最终产物为4-氯苯胺,无还原脱氯活性。
test was conducted to examine the effect of pH on the degradation of 4-Nitrochlorobenzene (4-ClNB) by zero-valent iron(Fe0). The results show that, the reductive transformation rate of 4-ClNB significantly decreased with increasing pH. The lower of the pH value, the degradation of 4-ClNB was faster. 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 of the reduction process of change was detected under different pH. It found that the reaction pH value gradually increased while pH value was less than 7, and pH was 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.
李燕、王璐璐
环境污染、环境污染防治化学工业概论电化学工业
零价铁4-氯硝基苯降解pH机理
zero-valent iron4-NitrochlorobenzenepHmechanism
李燕,王璐璐.pH对零价铁降解4-氯硝基苯的影响[EB/OL].(2010-09-06)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201009-94.点此复制
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