引用本文:郭莹,陈鸿汉,张焕祯,庞浩,王晖,王宁,常思淼,等.Fenton氧化降解2-硝基-4-甲氧基苯胺的特性和动力学特征[J].环境科学研究,2017,30(10):1613-1621.
GUO Ying,CHEN Honghan,ZHANG Huanzhen,PANG Hao,WANG Hui,WANG Ning,CHANG Simiao,et al.Characteristics and Kinetics of Oxidative Degradation of 2-Nitro-4-Methoxyaniline by Fenton Oxidation Process[J].Reserrch of Environmental Science,2017,30(10):1613-1621.]
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Fenton氧化降解2-硝基-4-甲氧基苯胺的特性和动力学特征
郭 莹1, 陈鸿汉1, 张焕祯1, 庞 浩2, 王 晖1, 王 宁1, 常思淼1
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
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(H2O2)、初始c(Fe2+)、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(H2O2)为10 mmol/L、初始c(Fe2+)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 kJ/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.
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
DOI:10.13198/j.issn.1001-6929.2017.02.85
分类号:
基金项目:国家自然科学基金项目(51238001)
Characteristics and Kinetics of Oxidative Degradation of 2-Nitro-4-Methoxyaniline by Fenton Oxidation Process
GUO Ying1, CHEN Honghan1, ZHANG Huanzhen1, PANG Hao2, WANG Hui1, WANG Ning1, CHANG Simiao1
1.Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, China ;2.Beijing Z.D.H.K. Environmental Science & Technology Co., Ltd., Beijing 100120, China
Abstract:
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(Fe2+) 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 kJ/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.
Key words:  2-nitro-4-methoxyaniline  Fenton oxidation process  hydroxyl radical  kinetics  Arrhenius Equathon