活性炭負載金屬氧化物催化臭氧氧化甲硝唑

採用浸漬法製備了Fe、Ni、Ag、Ce 4種金屬氧化物負載活性炭（MeOx/AC）催化劑，並用於甲硝唑（MNZ）的催化臭氧氧化降解，以考察其催化活性。在 20 mg/h的臭氧投加量下，催化劑的加入（0.5 g）對MNZ（C₀5 mg/L；pH = 5.5）的氧化和礦化有明顯改善，其中NiOx/AC催化劑表現出較好的催化活性，反應 60 min後，MNZ和TOC的去除率分別達 87%和30%，較AC催化臭氧氧化（80%和26%）及單獨臭氧氧化（70%和10%）有所提高。叔丁醇或硝酸根的加入對MNZ的降解起抑制作用。
Activated carbon-supported（Fe, Ni, Ag, Ce）metallic oxide catalyst (MeOx/AC) was prepared by impregnation. The activity of four kinds of MeOx/AC in the catalytic ozonation of aqueous phase metronidazole (MNZ) was evaluated. In the 20 mg/h of ozone dosage, the oxidation and mineralization of MNZ (C0=5 mg/L; pH=5.5) was significantly improved in presence of catalyst (0.5 g). NiOx/AC provides preferable catalytic activity. The oxidation of MNZ and its TOC removal rates were 87% and 30% at 60 min, compared with AC catalytic ozonation (80% and 26%) and ozonation alone (70% and 10%). Addition of tert-butanol or nitrate showed inhibition on MNZ degradation. Copyright © 2011 環境工程學報.