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    化学:臭氧氧化

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    Adjust the aniline solution pH to different initial value by adding sulfuric acid and sodium hydroxide. The influence of solution pH on the degradation of aniline by ozone is illustrated in Fig. 3.

    苯胺配置溶液用硫酸和氢氧化钠调节不同初始pH,溶液的pH对苯胺O3降解的影响如图3所示。

    属类:化学及生命科学-化学-臭氧氧化

    Fig. 3 Influence of pH on the degradation of aniline

    图3pH对苯胺降解的影响

    属类:化学及生命科学-化学-臭氧氧化

    As shown in Fig.3, the aniline degrades less rapidly in acid reaction system and will degrade more and more rapidly as the pH increases.

    由图3可知,反应体系属于酸性条件时,苯胺降解速率均较小,随着pH值的增加,苯胺降解速率逐渐提高,

    属类:化学及生命科学-化学-臭氧氧化

    However, when the pH rises to a certain value, the degradation rate of aniline will drop.

    但当pH值升到一定程度以后,去除率又有所下降。

    属类:化学及生命科学-化学-臭氧氧化

    resulted from self-decomposition of ozone in basic solution will catalyze and induce free radical ?OH

    臭氧在碱性溶液中自分解产生的HO2-离子会催化诱发自由基?OH,生成的?OH特别活泼,HO2-ion

    属类:化学及生命科学-化学-臭氧氧化

    which is very active and has higher electron affinities and higher electrode potential than common strong oxidant, and can react with organic pollutants in the wastewater rapidly and non-selectively. (Tedder D W, 1996)

    比其他常用的强氧化剂具有更高的电极电势,且电子亲和能更高,它能快速而无选择地与废水中有机物进行反应(Tedder D W,1996)。

    属类:化学及生命科学-化学-臭氧氧化

    The decomposition of ozone and production of ?OH will become faster as the pH increases,

    随着pH值升高,臭氧分解形成?OH的速度加快,

    属类:化学及生命科学-化学-臭氧氧化

    resulting in a fairly high removal rate of aniline at neutral and slightly basic pH range.

    因此pH中性或偏碱性范围内苯胺去除率较高。

    属类:化学及生命科学-化学-臭氧氧化

    In the reaction, some aniline is completely oxidized to CO2 or partially oxidized to carboxylic acid.

    在反应中有一部分苯胺被完全氧化或部分氧化成CO2或羧酸,

    属类:化学及生命科学-化学-臭氧氧化

    With the initial concentration of aniline at 200mg/L, pH at 7.0 and flow rate of ozone at 5.0 mg/min, 98% of aniline will be removed after 5 min.

    苯胺初始浓度200mg/L时,pH值7.0、臭氧流量为5.0mg/min,经5min后苯胺去除率达到98%以上。

    属类:化学及生命科学-化学-臭氧氧化

    The degradation velocity of TOC is lower than that of aniline.

    TOC降解速率低于苯胺分子降解速率

    属类:化学及生命科学-化学-臭氧氧化

    After reaction for 5 min., 98% of aniline will be removed.

    反应5min,就可以去除98%以上的苯胺,

    属类:化学及生命科学-化学-臭氧氧化

    However, both the elimination velocity and rate of TOC are lower than that of aniline.

    而TOC的去除比苯胺慢,同样去除率也要低,

    属类:化学及生命科学-化学-臭氧氧化

    After reaction for 30 min., only 60.5% of TOC has been removed while nearly all the aniline has been removed .

    反应30min,废水TOC去除率为60.5%,而此时苯胺已基本全部去除。

    属类:化学及生命科学-化学-臭氧氧化

    The results tell us that the degradation velocity of aniline is faster than that of TOC and the degradation velocity of by-products such as CO2 , water and inorganic ions is fairly slow during ozonation of aniline

    说明苯胺的O3反应过程中,苯胺的降解速率比TOC要快得多,而中间产物降解成CO2、水和无机离子的速度比较慢

    属类:化学及生命科学-化学-臭氧氧化

    A Study on the Mechanism of Ozonation of Aniline

    臭氧氧化处理苯胺废水的机理研究

    属类:化学及生命科学-化学-臭氧氧化

    The result of study on the ozonation of simulated wastewater containing aniline shows that ozone is very effective in removing aniline.

    研究结果表明,O3对苯胺有很好的去除效果,

    属类:化学及生命科学-化学-臭氧氧化

    After reaction for 30 minutes, the removal rate of TOC is 40% lower than that of aniline, which shows a series of intermediate by-products, mainly benzoquinone, as detected by HPLC and IC, are resulted from the decomposition of aniline.

    反应30min后,TOC去除率比苯胺去除率低40%左右,表明伴随着苯胺的分解,生成一系列中间产物,通过HPLC和IC检测主要为苯醌等.

    属类:化学及生命科学-化学-臭氧氧化

    A possible pathway of aniline degradation by O3 is given.

    提出了O3降解苯胺的可能途径。

    属类:化学及生命科学-化学-臭氧氧化

    The wastewater containing aniline mainly comes from chemical processes of dye, pharmaceutical and petroleum sectors.

    苯胺废水主要产生于染料、制药、石油等化工过程。

    属类:化学及生命科学-化学-臭氧氧化

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