钴锰双金属氧化物催化过硫酸氢钾降解酸性橙7的研究
发布时间：2018-08-22 15:21
【摘要】：为了研究CoMnO_x在常温下活化过硫酸氢钾(PMS)产生硫酸根自由基(SO_4~-·)降解酸性偶氮染料酸性橙7(AO7)的效能,采用溶胶-凝胶法制备CoMnO_x双金属催化剂,考察了CoMnO_x投量、PMS投量、AO7初始浓度以及初始p H对PMS/CoMnO_x体系降解AO7效果的影响.结果显示,CoMnO_x和PMS投量的增加对AO7的去除率均有提升效果,而随着AO7初始浓度的增加,PMS/CoMnO_x体系对其的去除率逐渐降低,在最优条件下反应20min后AO7的去除率达95.28%,较单金属催化效果提升显著,体系初始p H值对AO7降解有显著影响,弱酸性条件下有利于CoMnO_x催化PMS氧化反应的进行.通过投加乙醇和叔丁醇两种不同种类的猝灭剂,证实了AO7的降解主要是SO_4~-·和·OH共同作用的结果,其中SO_4~-·起主导作用.利用X射线衍射(XRD)、X射线光电子能谱(XPS)对催化剂进行表征,结果表明催化剂的主要存在形式为Mn Co_2O_4其中Co~(2+)、Co~(3+)、Mn~(2+)、Mn~(3+)、晶格氧、羟基氧的物质的量百分比分别为27.94%、6.16%、11.42%、19.99%、25.99%、8.68%.
[Abstract]:In order to study the effect of CoMnO_x on the degradation of acid azo dye acid orange 7 (AO7) by activation of potassium persulfate (PMS) at room temperature, CoMnO_x bimetallic catalyst was prepared by sol-gel method. The effects of initial concentration of AO7 and initial pH of CoMnO_x on the degradation of AO7 in PMS/CoMnO_x system were investigated. The results showed that both the increase of CoMnOx and the amount of PMS increased the removal rate of AO7, but with the increase of the initial concentration of AO7, the removal rate of AO7 / CoMnOx system decreased gradually. Under the optimum conditions, the removal rate of AO7 reached 95.288.The initial pH value of the system has a significant effect on the degradation of AO7, and the weak acid condition is favorable to the oxidation of PMS catalyzed by CoMnO_x. By adding two kinds of quenching agents, ethanol and tert-butanol, it is proved that the degradation of AO7 is mainly the result of the interaction of so _ 4O _ 4 and OH, and so _ 4 ~ (-) plays a leading role in the degradation of AO7. X-ray diffraction (XRD) X-ray photoelectron spectroscopy (XPS) was used to characterize the catalyst. The results showed that the main forms of the catalyst were mn Co_2O_4, where Co ~ (2) C ~ (3) O ~ (3) O ~ (2) mn ~ (2) O ~ (2), O _ (2), O _ (3) were 27.94 ~ 6.16% and 11.4219.99 ~ (19. 99) ~ (25.99N) 25.99m = 8.68, respectively.
【作者单位】： 四川大学建筑与环境学院;
【基金】：国家自然科学基金项目(51508353) 大学生创新创业训练计划(201610611024)
【分类号】：X703
[Abstract]:In order to study the effect of CoMnO_x on the degradation of acid azo dye acid orange 7 (AO7) by activation of potassium persulfate (PMS) at room temperature, CoMnO_x bimetallic catalyst was prepared by sol-gel method. The effects of initial concentration of AO7 and initial pH of CoMnO_x on the degradation of AO7 in PMS/CoMnO_x system were investigated. The results showed that both the increase of CoMnOx and the amount of PMS increased the removal rate of AO7, but with the increase of the initial concentration of AO7, the removal rate of AO7 / CoMnOx system decreased gradually. Under the optimum conditions, the removal rate of AO7 reached 95.288.The initial pH value of the system has a significant effect on the degradation of AO7, and the weak acid condition is favorable to the oxidation of PMS catalyzed by CoMnO_x. By adding two kinds of quenching agents, ethanol and tert-butanol, it is proved that the degradation of AO7 is mainly the result of the interaction of so _ 4O _ 4 and OH, and so _ 4 ~ (-) plays a leading role in the degradation of AO7. X-ray diffraction (XRD) X-ray photoelectron spectroscopy (XPS) was used to characterize the catalyst. The results showed that the main forms of the catalyst were mn Co_2O_4, where Co ~ (2) C ~ (3) O ~ (3) O ~ (2) mn ~ (2) O ~ (2), O _ (2), O _ (3) were 27.94 ~ 6.16% and 11.4219.99 ~ (19. 99) ~ (25.99N) 25.99m = 8.68, respectively.
【作者单位】： 四川大学建筑与环境学院;
【基金】：国家自然科学基金项目(51508353) 大学生创新创业训练计划(201610611024)
【分类号】：X703
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