超声协同双金属Fe-CoO_x异相催化PMS的研究

RESEARCH ON THE ACTIVATION OF PMS BY HETEROGENEOUS CATALYSTS OF Fe-CoO_x IN ASSOCIATED WITH ULTRASONIC

采用溶胶-凝胶法(sol-gel method)制备铁钴双金属氧化物(Fe-CoO_x)催化剂,研究其协同超声(超声)催化过硫酸氢钾(PMS,KHSO5)降解酸性橙7(AO7)的效果及机理。结果显示:Fe-CoO_x/US/PMS体系的催化效果相较同条件下Fe Ox/US/PMS、CoO_x/US/PMS体系更好;随着初始PMS浓度的增加,AO7的降解率先增加后降低;增加US功率后AO7的降解率先增加后降低;Fe-CoO_x初始投加量从0.035 g/L上升至0.05 g/L后,30 min时AO7的降解率由30.58%上升至77.50%,继续增加投量,提升效果不明显;AO7的降解率与初始AO7呈负相关;投加叔丁醇(TBA)、甲醇(MA),50 min时AO7的降解率分别为60.64%、26.58%,表明体系中自由基主要为·OH和SO-4·。XRD和XPS结果显示:Fe-CoO_x催化剂粒径为8.8~10.7 nm,催化剂中的Fe、Co主要以Fe2+、Fe3+、Co2+、Co3+存在,并且表面羟基氧的含量为24.07%。研究显示:Fe-CoO_x催化剂具有较好的催化性能,能够有效地协同超声催化PMS生成自由基,对水中污染物的降解具有良好的效果。

The paper prepared bimetallic iron cobalt oxide（ Fe-CoO_x） catalyst by the sol-gel method and discussed the synergistic action of Fe-CoO_xcatalysts and ultrasonic to degrade acid orange 7（ AO7） by activating KHSO5（ PMS）. The results showed that the Fe-CoO_x/ US / PMS system had a higher activity than the Fe Ox/ US / PMS、CoO_x/ US / PMS system. With the increase of the initial PMS,the degradation rate of AO7 was first raised and then dropped; and with the US power increasing,the degradation rate of AO7 was also raised and then dropped; in addition,the degradation rate of AO7 increased from30. 58% to 77. 50% after 30 minutes,with the initial Fe-Coxdosage increasing from 0. 035 g / L to 0. 05 g / L and it had a negative correlation with the initial AO7 concentration; adding tert butyl alcohol（ TBA） and methanol（ MA）,the degradation rate of AO7 was 60. 64% and 26. 58% after 50 minutes,respectively,indicating that the free radicasl in the catalytic system were mainly ·OH and SO-4·. XRD and XPS results showed that the particle size of Fe-CoO_xcatalyst ranged from 8. 8 to10. 7 nm,and the Fe and Co mainly existed as the form of Fe2 ＋、Fe3 ＋、Co2 ＋、Co3 ＋. The content of surface hydroxyl oxygen in the catalyst was 24. 07%. The results showed that Fe-CoO_xcatalyst had a better catalytic performance,and effectively cooperated with PMS to generate free radicals,which had a positive effect on the degradation of pollutants in water.