Fenton氧化降解2-硝基-4-甲氧基苯胺的特性和动力学特征  

Characteristics and Kinetics of Oxidative Degradation of 2-Nitro-4-Methoxyaniline by Fenton Oxidation Process

作　　者：郭莹[1] 陈鸿汉[1] 张焕祯[1] 庞浩 王晖[1] 王宁[1] 常思淼 

机构地区：[1]中国地质大学(北京)水资源与环境工程北京市重点实验室,北京100083 [2]北京中地泓科环境科技有限公司,北京100120

出　　处：《环境科学研究》2017年第10期1613-1621,共9页Research of Environmental Sciences

基　　金：国家自然科学基金项目(51238001)

摘　　要：为探究Fenton试剂氧化降解2-N(2-硝基-4-甲氧基苯胺)的特性,通过实验室试验系统研究了初始pH、初始c(H_2O_2)、初始c(Fe^(2+))、初始ρ(2-N)和反应温度等因素对2-N去除率的影响以及动力学特征.结果表明:Fenton试剂氧化降解2-N效果显著,各试验组分别在初始pH为3.0、初始c(H_2O_2)为10 mmol/L、初始c(Fe^(2+))为1 mmol/L、初始温度为50℃、ρ(2-N)为100 mg/L时2-N的去除率相对最高,其降解过程均符合二级动力学模型;2-N去除率随温度的升高而增大,基于在不同温度下的速率常数,推导出了2-N降解的阿伦纽斯(Arrhenius Equation)经验表达式,得到Fenton氧化2-N的活化能为30.23 k J/mol.研究显示,经Fenton氧化后,2-N分子断链开环,生成多种小分子酸,最终降解为二氧化碳和水.A series of batch experiments were carried out to investigate the effects of temperature,initial pH,initial c（ H2O2） 、initial c（ Fe2 ＋） 、initial ρ（ 2-N） and the temperature on the oxidative degradation of 2-N（ 2-nitro-4-methoxyaniline） by Fenton oxidation process,along with the elucidation of its kinetic characteristics. The results showed that the oxidative degradation of 2-N by Fenton reagent was remarkable. The relatively highest 2-N removal rates in each group were observed an initial pH of 3,initial c（ H2O2） of 10 mmol/L,initial c（ Fe^2 ＋） of 1 mmol/L,initial temperature of 50 ℃ and initial ρ（ 2-N） of 100 mg/L respectively. The degradation process was found to follow a second-order kinetic model. The removal rate of 2-N increased with temperature. The Arrhenius Equation for the degradation of 2-N was derived from the rate constant values at different temperatures,and the activation energy of 2-N for the Fenton oxidation process was calculated to be 30. 23 k J/mol. Along the Fenton process,the chains and ring of 2-N were decomposed to produce a variety of small acid molecules,which were eventually degraded into carbon dioxide and water.

关 键 词：2-硝基-4-甲氧基苯胺 FENTON氧化 羟基自由基 反应动力学 阿伦纽斯方程 

分 类 号：X703.1[环境科学与工程—环境工程]