| 活性炭催化过氧化氢去除荧光增白剂 |
| 摘要点击 3385 全文点击 1498 投稿时间：2013-10-28 修订日期：2014-02-14 |
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| 中文关键词 活性炭 过氧化氢 催化氧化 荧光增白剂 |
| 英文关键词 activated carbon(AC) hydrogen peroxide catalytic oxidation fluorescent whitening agent |
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| 中文摘要 |
| 研究了活性炭（activated carbon，AC）吸附、改性活性炭（activated carbon modified，ACM）吸附、过氧化氢（H2O2）氧化、AC催化H2O2等方法对水体中荧光增白剂VBL的处理效果，并通过自由基俘获剂叔丁醇、催化过程气体分析等探讨了AC催化H2O2分解VBL的机制. 结果表明，经硝酸铁[Fe（NO3）3]改性过的ACM对VBL的吸附去除率高于未改性的AC. 活性炭催化H2O2对VBL的去除效果明显，但未改性AC催化去除率高于ACM. 60 min时，AC催化氧化去除率即可达到95%以上，而ACM仅为58%. 叔丁醇的加入降低了AC和ACM催化氧化对VBL的去除率，表明AC催化H2O2氧化能促进H2O2形成羟基自由基（·OH）和原子氧参与反应. AC催化H2O2分解及释放气体分析表明，AC能催化H2O2形成氧气并放热，且ACM明显快于AC. 结合催化H2O2去除VBL效率的结果分析，ACM催化反应时活性中间物（自由基和原子氧等）产生速率快于AC，活性中间物自身消耗形成氧气，而不是用于分解VBL. 催化反应中活性中间产物的形成速率与反应物供给速率的不匹配可能是导致ACM催化效果弱于AC的重要原因. |
| 英文摘要 |
| Degradation of fluorescent whitening agent VBL in the processes of activated carbon (AC) and activated carbon modified (ACM) adsorptions, hydrogen peroxide (H2O2) oxidation, and hydrogen peroxide oxidation catalyzed by activated carbon were studied. Mechanism of the above catalytic oxidation was also investigated by adding tert-Butyl alcohol (TBA), the free radical scavenger, and detecting the released gases. The results showed that: the activated carbon modified by Fe(NO3)3 (ACM)exhibited better adsorption removal than AC. Catalytic oxidation showed efficient removal of VBL, and the catalytic removal of AC (up to 95%) was significantly higher than that of ACM (58% only). Catalytic oxidation was inhibited by TBA, which indicates that the above reaction involved·OH radicals and atom oxygen generated by hydrogen peroxide with the presence of AC. The results of H2O2 decomposition and released gases detection involved in the process showed that activated carbon enhanced the decomposition of H2O2 which released oxygen and heat. More O2 was produced and higher temperature of the reactor was achieved, which indicated that H2O2 decomposition catalyzed by ACM was significantly faster than that of AC. Combining the results of VBL removal, it could be concluded that the rate of active intermediates (·OH radicals and atom oxygen) production by ACM catalytic reaction was faster than that of AC. These intermediates consumed themselves and produced O2 instead of degrading VBL. It seemed that the improper mutual matching of the forming rate of activating intermediates and the supply rate of reactants was an important reason for the lower efficiency of ACM catalytic reaction comparing with AC. |
