Fenton氧化体系·OH、ORP、H_2O_2和Fe^(2+)变化特征  

·OH,ORP,H_2O_2 AND Fe^(2+) VARIATION CHARACTERISTICS OF FENTON'S OXIDATION SYSTEM

作　　者：汪昆平[1] 杨林[1] 汪春艳[1] 赵越[1] 郭劲松[1] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045

出　　处：《水处理技术》2011年第12期36-41,共6页Technology of Water Treatment

基　　金：国家科技攻关计划重大项目(2006BAJ08B08);重庆市自然科学基金资助项目(CSTC;2008BB7299);中央高校基本科研业务基金资助项目(CDJRC10210006)

摘　　要：通过对Fenton体系.OH、ORP、H2O2和Fe2+变化关系的考察,研究了Fenton反应过程特点和规律。结果显示,随着Fenton反应的快速进行,体系很快达到稳定状态,反应过程.OH生成量、ΔORP随时间变化关系可用Y=a.b.X/(1+b.X)模型描述,H2O2、Fe2+反应符合动力学模型dC/dt=-k(C-l)。基于Fenton体系.OH生成量平台稳定值、ΔORP平台稳定值及其达到平台稳定值所需时间,适宜n(H2O2)/n(Fe2+)比为1:1。当n(H2O2)/n(Fe2+)比为2时,.OH生成量平台稳定值最大、Fe2+反应速率常数最大。H2O2/Fe2+比值不同引起的最大.OH生成量平台稳定值高出最小.OH生成量平台稳定值不到8%,而引起的最大ΔORP平台稳定值高出最小ΔORP平台稳定值超过83%。Fenton体系Fe2+转化率为91.7%～98.7%、H2O2转化率为38.9%～68.4%,H2O2/Fe2+比值、pH对Fe2+转化率影响较小,对H2O2的转化率影响较大;较低H2O2转化率与较低ΔORP是对应的。The characteristics of the Fenton reaction, with investigation of relationship of the ·OH, ORP, H2O2 and Fe2＋, was studied. The result showed that the system reached a steady state quickly with the reaction ofthe Fenton system. In the reaction process, the relationship of the of oOH formiug concentration, AORP with time could be described as a model of Y=a·b·X/（1 ＋b·X）. The reaction of H202 ,Fe2＋ obeyed the first-order kinetic model of dC/dt=-k （C-1）. The suitable molar ratio of the H2O2/Fe2＋ was 1 ： 1 ,based on the platform stable value of the oOH forming concentration and AORP and the time required to achieve the Maximum AORP. When H2O2/Fe2＋ ratio was 2, the o OH platform concentration and Fe2＋ reaction rate constant were maximum. The difference of the platform stable value of the oOH forming concentration between the maximum and the minimum is was less than 8%, while the difference between the platform stable value of the maximum AORP was more than 83%, which were caused by the different ratio of the H2O2 /FeC In the Fenton system, the conversion rate of Fe2＋ and H2O2 was 91.7%-98.7% and 38.9%-68.4% respectively. The pH and the molar ratio of the H2O2/Fe2＋ had minor effect on the conversion of the Fe2＋, but they had greater one on H2O2. The lower H2O2 conversion rate was corresponding to the lower AORP platform.

关 键 词：FENTON反应 ·OH ORP H2O2 Fe2+ 

分 类 号：X703.1[环境科学与工程—环境工程]