介孔硅负载FeOOH-CuOOH异相Fenton降解DNT的研究

摘要本课题主要采用非均相Fenton氧化法处理DNT废水，并用XRD以及电镜表征复合催化剂负载前后的变化。开展了影响DNT去除的单因素实验，结果表明其去除率的变化与初始pH值、催化剂浓度、双氧水浓度以及温度的变化密切相关。经过正交实验后得出的最佳催化氧化方法为初始pH=5、催化剂浓度1.0g/L、双氧水投加浓度5.876mmol/L、温度为50°C，其去除率可以达到99%以上。通过数学模型的拟合对反应的动力学过程作了研究，研究显示，DNT的催化氧化过程基本符合假一级反应。探究非均相芬顿催化剂FeOOH-CuOOH催化氧化DNT的机理，结果显示含铁催化剂和双氧水在去除试验中确有协同作用，并且实验中加入抑制剂后，去除率几乎为零，说明双氧水可以产生羟基自由基·OH，而且此基团在降解过程中发挥着主要的氧化去除作用。63823

毕业论文关键词：二硝基甲苯（DNT）异相Fenton 催化氧化

毕业设计说明书（论文）外文摘要

Title Research of DNT degradation of heterogeneous Fenton with FeOOH - CuOOH loaded on mesoporous silica
Abstract This topic mainly adopts heterogeneous Fenton oxidation treating wastewater containing DNT. The batch experiments of DNT degradation were developed. The results show that the degradation rate strongly depends on the initial solution pH, catalyst dosage, concentration of hydrogen peroxide, and temperature. The optimal degradation condition is initial pH = 5, catalyst dosage of 1.0 g/L, hydrogen peroxide concentration of 5.876 mmol/L, temperature 50℃. Under this condition, DNT degradation rate is more than 99%. In addition, this work also includes the mathematical model research of DNT degradation dynamics. It shows that the catalytic oxidation process of DNT is well fitted by pseudo-first-order kinetic.Finally, the comparative experiments of DNT degradation were carried out, which explored the degradation mechanism, and indicate that the catalyst and hydrogen peroxide are indispensable in the degradation test. When inhibitor was added, the degradation rate was almost zero, which suggests the hydroxyl radical ·OH plays a major role on oxidative degradation in degradation process .

Keywords DNT ; Heterogeneous Fenton ; Catalytic oxidation

1 引言 1

1.1水体有机污染概况 1

1.2二硝基甲苯概述 1

1.2.1概述 1

1.2.2环境中二硝基甲苯的主要来源 1

1.2.3二硝基甲苯的危害以及去除研究意义 1

1.3环境中二硝基甲苯污染治理技术进展 2

1.3.1微生物法 2

1.3.2焚烧法 2

1.3.3活性炭吸附法 2

1.3.4氧化技术 3

1.4芬顿催化剂 4

1.4.1催化剂 4

1.4.2介孔硅载体 5

1.5研究目的与研究内容 6

1.5.1研究目的 6

1.5.2研究内容 6

2 实验试剂及分析方法 7

2.1 实验所用仪器及试剂 7

2.2催化剂的合成 7

2.3配置溶液 8

2.4实验步骤介孔硅负载FeOOH-CuOOH异相Fenton降解DNT的研究:http://www.751com.cn/huaxue/lunwen_70599.html