Removal of a type of endocrine disruptors--di-n-butyl phthalate from water by ozonation.
Removal of a type of endocrine disruptors--di-n-butyl phthalate from water by ozonation.
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DOI：
10.1016/s1001-0742(06)60003-x
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发表时间：
2006-09
影响因子：
6.9
通讯作者：
Hai-yan Li;J. Qu;Huijuan Liu
中科院分区：
文献类型：
--
作者：
Hai-yan Li;J. Qu;Huijuan Liu
研究了臭氧氧化处理含内分泌干扰物邻苯二甲酸二丁酯（DBP）的合成水。考察了pH值、温度、离子强度、臭氧投加量和DBP初始浓度等因素对反应的影响。此外，还研究了自由基对非催化臭氧化和催化臭氧化的活性。研究了臭氧氧化过程中的降解中间产物及动力学。结果表明，臭氧氧化DBP遵循两种机理。首先，在较低的pH、温度和离子强度下，直接臭氧化反应速率较慢。对于间接自由基反应，当这些因素增加时，随着初始臭氧投加量的增加和DBP初始浓度的降低，DBP的去除率较高。叔丁醇、腐殖酸和Fe（II）通过自由基途径影响DBP的臭氧化。实验结果表明，叔丁醇对自由基有抑制作用，从而抑制了臭氧氧化。腐殖物质对反应有一定的促进作用，但超过最佳用量时会产生轻微的负面影响。Mn（II）对臭氧氧化的影响是通过活性中心机制实现的。实验中，臭氧氧化过程中产生了三种不同的中间产物，但每种中间产物的生成量均随pH、温度、离子强度和臭氧初始投加量的增加而减少。得到了臭氧与DBP反应的动力学方程。
Ozonation of synthetic water containing a type of endocrine disruptor—di-n-butyl phthalate (DBP) was examined. Key impact factors such as pH, temperature, ionic strength, ozone dosage and initial DBP concentration were investigated. In addition, the activities of radicals on uncatalysed and catalysed ozonation were studied. The degradation intermediate products were followed and the kinetic of the ozonation were assessed as well. Results revealed that ozonation of DBP followed two mechanisms. Firstly, the reaction rate of direct ozonation was slower at lower pH, temperature, and ionic strength. Secondly, when these factors were increased for indirect radical reaction, higher percentage of DBP was removed with the increase of the initial ozone dosage and the decrease of the initial DBP concentration. In addition, tert-butanol, humic substances and Fe(II) affected DBP ozonation through the radical pathway. It was determined that ozonation was restrained by adding tert-butanol for its radical inhibition effect. Furthermore, humic substances enhanced the reaction to some extent, but a slight negative effect would be encountered if the optimum dosage was exceeded. As a matter of fact, Mn(II) affected the ozonation by “active sites” mechanism. In the experiment, three different kinds of intermediate products were produced during ozonation, but the amount of products for each one of them decreased as pH, temperature, ionic strength and initial ozone dosage increased. A kinetic equation of the reaction between ozone and DBP was obtained.