摘要：现如今工业废水污染问题严重，尤其是现代印染工业中流失的染料。刚果红染料在生产使用中流失程度大，进入水体后的危害程度也巨大，本实验通过批量试验研究了在不同反应条件下，单独锌粉(Zn0)以及纳米硅胶（nSG）协同锌粉对偶氮染料刚果红的作用效果及其影响因素。结果表明，影响刚果红(CR)降解效果的主要因素有：微米锌粉的投加量、体系的初始 pH 值、刚果红的初始浓度等。纳米硅胶在体系中主要承担负载和分散锌粉的作用，在 25 ℃，pH=4 时投加 0.5 g/L 微米锌，2 g/L 纳米硅胶时50 mg/L的刚果红溶液脱色率可达 95%以上。而且，通过在此基础上继续增大微米锌投加量，降低体系溶液的pH，适当提高反应的温度或延长反应时间等方法亦可使刚果红降解得更加完全。26581
毕业论文关键词：锌粉；纳米硅胶；刚果红；降解
The removal of azo dye congo red by Zn0 assisted with nano silica gel
Abstract：Nowadays, with the rapid development of economic, the pollution of the industrial wastewater is increasingly severe, especially the lapsed dyes from the printing and dyeing industry. The loss degree of the azo dye congo red is pretty high during its production and application. It can do great harm to the environment when discharged into water-body. And the degradaion of azo dyes is difficult. In this study, batch experiments have been conducted under different reaction conditions to investigate the influencing factors to azo dye congo red degraded by zero-valent zinc (Zn0) and the combination system of Zn0 and nanosize silica gel. The effect of the initial concentration of congo red, dosage of Zn0 and the initial pH of the system on the degradation of congo red was also examined. Results show that the adopt of the nanosize silica gel can load and disperse Zn0. And the optimum degradation condition for congo red is: pH=4, silica gel dosage = 2 g/L, the dosage of Zn0= 0.5 g/L, approximately above 95% of the initial congo red was removed under this condition. With the increase of Zn0 dosage, temperature and the reaction time, and the decrease of pH, the removal rate of congo red could be improved.
Key words: zero-valent zinc; silica gel; congo red; degradation
目 录
摘要1
关键词1
Abstract1
Key words1
引言2
1材料与方法3
1.1试剂与仪器3
1.2溶液配制3
1.3实验准备3
1.4实验步骤4
1.5分析方法4
1.5.1刚果红的分析方法4
2 结果与讨论5
2.1 不同体系中刚果红的降解比较5
2.2不同锌粉用量对降解速率的影响 6
2.3不同纳米硅胶用量对降解速率的影响 7
2.4 pH对纳米硅胶协同锌粉降解刚果红的影响 8
2.5温度对纳米硅胶协同锌粉降解刚果红的影响9
2.6 CR初始浓度对纳米硅胶协同锌粉降解效果的影响10
3.结论11
致谢 11
参考文献12
纳米硅胶协同锌粉降解偶氮染料刚果红
引言
随着国民经济的快速发展，环境污染日益严重，尤其是水污染尤为严重。据统计，在印染工业过程中流失的染料占染料比重的15%[1]，以工业废水的形式排放到环境中，并因成分复杂、色度高、可生化性差，传统的处理方法很难使其达标，是染料工业废水处理的一大难题。根据染料的化学性质不同，可将染料分为偶氮染料、酞菁染料、蒽醌染料、菁类染料、靛族染料、芳甲烷染料、硝基染料和亚硝基染料等人工染料[2]。偶氮染料属难降解有机污染物，刚果红是偶氮染料中具有代表性的联苯胺类直接偶氮染料，它在生产和使用过程中流失率高,易进入水体,对环境的危害作用很大 .如果采用传统的生化处理方法(如活性污泥法)对其进行处理，效果不很理想。在厌氧条件下，刚果红甚至会生成毒性更大的芳香胺类物质[3]。因此 ，开发新的降解过程有重要的实际意义。 纳米硅胶协同锌粉降解偶氮染料刚果红:http://www.youerw.com/huaxue/lunwen_20810.html