有機酸根對鐵氧化物催化UV-Fenton降解染料的性能影響及其機理研究
發(fā)布時間:2019-02-19 12:17
【摘要】:多相光助-芬頓技術作為高級氧化技術的一種,具有非常大的應用潛力。鐵氧化物是多相芬頓催化劑開發(fā)常用的活性組分,通過研究不同晶型鐵氧化物之間的催化性能可以為開發(fā)新型、高效的多相催化劑提供理論依據(jù),將有助于多相芬頓技術的發(fā)展。本文選取了五種不同晶型的鐵氧化物作為多相芬頓體系的催化劑,比較研究了它們在芬頓和紫外光助-芬頓體系中催化降解橙Ⅱ的性能。結果表明:紫外光的加入能夠極大地提高各體系的降解效率;在紫外光照射下,以磁鐵礦和磁赤鐵礦組成的混晶的催化性能和穩(wěn)定性能最佳,五種鐵氧化物的催化性能大小為:混晶磁鐵礦針鐵礦≈磁赤鐵礦赤鐵礦;在反應過程中五種鐵氧化物都伴隨有一定量的鐵離子溶出,但只有混晶溶出的鐵離子能夠在反應結束后吸附回來。而后在反應體系中加入一定量的有機酸根,重點研究了不同的有機酸根對體系中橙Ⅱ降解的影響。研究發(fā)現(xiàn),不同的有機酸根對多相光助-芬頓體系降解橙Ⅱ的影響不同,丙二酸鈉和草酸鈉會促進橙Ⅱ的降解,EDTA、檸檬酸三鈉和乙酸鈉則會抑制橙Ⅱ的降解,其中草酸鈉能夠極大地促進體系降解橙Ⅱ的效率,它的最佳添加濃度為0.5mmol/L。通過進一步的研究發(fā)現(xiàn),草酸根對體系降解效率的促進主要是通過促進鐵離子的溶出來實現(xiàn)的。
[Abstract]:As a kind of advanced oxidation technology, multiphase photo-assisted Fenton technology has great application potential. Iron oxide is a common active component in the development of multiphase Fenton catalyst. The study on the catalytic performance of different crystalline iron oxides can provide theoretical basis for the development of new and efficient multiphase catalysts. It will be helpful to the development of multiphase Fenton technology. In this paper, five kinds of iron oxides with different crystalline forms were selected as catalysts for multiphase Fenton system, and their catalytic degradation properties of orange 鈪,
本文編號:2426493
[Abstract]:As a kind of advanced oxidation technology, multiphase photo-assisted Fenton technology has great application potential. Iron oxide is a common active component in the development of multiphase Fenton catalyst. The study on the catalytic performance of different crystalline iron oxides can provide theoretical basis for the development of new and efficient multiphase catalysts. It will be helpful to the development of multiphase Fenton technology. In this paper, five kinds of iron oxides with different crystalline forms were selected as catalysts for multiphase Fenton system, and their catalytic degradation properties of orange 鈪,
本文編號:2426493
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