光助非均相Fenton降解抗生素的研究

发布时间：2018-06-04 10:20

  本文选题：非均相Fenton + 紫外光　； 参考：《长安大学》2017年硕士论文

【摘要】：抗生素废水大多毒性高且不易降解,吸附法、沉淀法、生物降解法等常规的水处理技术已经不能满足对其的废水处理要求。然而,高级氧化技术对抗生素废水中有机污染物的去除具有非常广阔的前景,特别是光助非均相Fenton体系产生的高氧化电位的自由基,对抗生素废水具有良好的去除效果。本研究主要选取了两种不同类型的抗生素环丙沙星和磺胺甲恶唑作为研究对象,研究分析了UV/非均相Fenton体系对这两种抗生素的降解效果、反应动力学和反应机理以及催化剂的循环利用性能,为抗生素废水的处理提供了一定的理论指导和试验依据。本文利用浸渍振荡法制备了Na-Y型分子筛和Ls-5000氨基磷酸型螯合树脂型的载Fe2+催化剂,并研究了这两种不同类型的非均相Fenton催化剂在紫外光协同作用下对环丙沙星和磺胺甲恶唑的降解性能,结果表明这两种催化剂对环丙沙星和磺胺甲恶唑有良好的光催化氧化效果,可用于这两种抗生素的降解处理,且这两种催化剂都具有重复使用效能,可减少环境的污染。研究分析UV/非均相Fenton体系对环丙沙星和磺胺甲恶唑的降解效果。通过一系列的单因素试验确定了载铁催化剂用量、过氧化氢体积、抗生素溶液初始浓度和初始pH以及紫外光照功率等重要影响因素,在确定紫外光照功率,选用影响环丙沙星和磺胺甲恶唑降解率较大的四个因素进行正交实验,得到了降解环丙沙星和磺胺甲恶唑的最佳工序条件。通过对比不同反应体系下两种抗生素的降解效果,发现UV/H_2O_2/Fe(Ⅱ)/Na-Y分子筛体系下的降解效果更好,且两种催化剂都有很好的重复利用性能。文章还分析了UV/非均相Fenton体系对环丙沙星和磺胺甲恶唑的降解动力学与降解反应机理。通过对比反应前后两种抗生素的紫外-可见吸收光谱,发现该体系下两种抗生素都得到了较好的降解,最终认为两个反应过程均是由羟基自由基的强氧化作用致使抗生素被氧化分解。
[Abstract]:Most antibiotic wastewater are highly toxic and difficult to degrade. The conventional water treatment techniques such as adsorption precipitation biodegradation and so on can not meet the requirements of wastewater treatment. However, the advanced oxidation technology has a very broad prospect for the removal of organic pollutants in antibiotic wastewater, especially the free radical with high oxidation potential produced by photo-assisted heterogeneous Fenton system, which has a good effect on the removal of antibiotic wastewater. In this study, two different antibiotics ciprofloxacin and sulfamethoxazole were selected to study the degradation effect of UV/ heterogeneous Fenton system on these two antibiotics. The reaction kinetics, reaction mechanism and the recycling performance of the catalyst provide some theoretical guidance and experimental basis for the treatment of antibiotic wastewater. In this paper, Na-Y molecular sieve and Ls-5000 aminophosphoric acid chelating resin supported Fe2 catalyst were prepared by impregnation oscillation method. The degradation properties of ciprofloxacin and sulfamethoxazole on these two heterogeneous Fenton catalysts were studied. The results showed that the two catalysts had good photocatalytic oxidation effect on ciprofloxacin and sulfamethoxazole and could be used for the degradation treatment of these two antibiotics. The degradation of ciprofloxacin and sulfamethoxazole by UV/ heterogeneous Fenton system was studied. Through a series of single factor tests, the important factors such as the amount of iron-loaded catalyst, the volume of hydrogen peroxide, the initial concentration and pH of antibiotic solution, and the UV irradiation power were determined. Four factors affecting the degradation rate of ciprofloxacin and sulfamethoxazole were selected for orthogonal experiments. The optimum conditions for degradation of ciprofloxacin and sulfamethoxazole were obtained. By comparing the degradation efficiency of two antibiotics in different reaction systems, it was found that the degradation efficiency of UV / H _ 2O _ 2 / Fe (鈪，

本文编号：1977004