發(fā)布時(shí)間：2018-06-04 10:20

  本文選題：非均相Fenton + 紫外光��； 參考：《長安大學(xué)》2017年碩士論文

【摘要】：抗生素廢水大多毒性高且不易降解,吸附法、沉淀法、生物降解法等常規(guī)的水處理技術(shù)已經(jīng)不能滿足對(duì)其的廢水處理要求。然而,高級(jí)氧化技術(shù)對(duì)抗生素廢水中有機(jī)污染物的去除具有非常廣闊的前景,特別是光助非均相Fenton體系產(chǎn)生的高氧化電位的自由基,對(duì)抗生素廢水具有良好的去除效果。本研究主要選取了兩種不同類型的抗生素環(huán)丙沙星和磺胺甲惡唑作為研究對(duì)象,研究分析了UV/非均相Fenton體系對(duì)這兩種抗生素的降解效果、反應(yīng)動(dòng)力學(xué)和反應(yīng)機(jī)理以及催化劑的循環(huán)利用性能,為抗生素廢水的處理提供了一定的理論指導(dǎo)和試驗(yàn)依據(jù)。本文利用浸漬振蕩法制備了Na-Y型分子篩和Ls-5000氨基磷酸型螯合樹脂型的載Fe2+催化劑,并研究了這兩種不同類型的非均相Fenton催化劑在紫外光協(xié)同作用下對(duì)環(huán)丙沙星和磺胺甲惡唑的降解性能,結(jié)果表明這兩種催化劑對(duì)環(huán)丙沙星和磺胺甲惡唑有良好的光催化氧化效果,可用于這兩種抗生素的降解處理,且這兩種催化劑都具有重復(fù)使用效能,可減少環(huán)境的污染。研究分析UV/非均相Fenton體系對(duì)環(huán)丙沙星和磺胺甲惡唑的降解效果。通過一系列的單因素試驗(yàn)確定了載鐵催化劑用量、過氧化氫體積、抗生素溶液初始濃度和初始pH以及紫外光照功率等重要影響因素,在確定紫外光照功率,選用影響環(huán)丙沙星和磺胺甲惡唑降解率較大的四個(gè)因素進(jìn)行正交實(shí)驗(yàn),得到了降解環(huán)丙沙星和磺胺甲惡唑的最佳工序條件。通過對(duì)比不同反應(yīng)體系下兩種抗生素的降解效果,發(fā)現(xiàn)UV/H_2O_2/Fe(Ⅱ)/Na-Y分子篩體系下的降解效果更好,且兩種催化劑都有很好的重復(fù)利用性能。文章還分析了UV/非均相Fenton體系對(duì)環(huán)丙沙星和磺胺甲惡唑的降解動(dòng)力學(xué)與降解反應(yīng)機(jī)理。通過對(duì)比反應(yīng)前后兩種抗生素的紫外-可見吸收光譜,發(fā)現(xiàn)該體系下兩種抗生素都得到了較好的降解,最終認(rèn)為兩個(gè)反應(yīng)過程均是由羥基自由基的強(qiáng)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，

本文編號(hào)：1977004