活性炭负载金属氧化物催化臭氧氧化甲硝唑

Catalytic ozonation of metronidazole in presence of activated carbon supported metallic oxide catalyst

采用浸渍法制备了Fe、Ni、Ag、Ce 4种金属氧化物负载活性炭(MeOx/AC)催化剂,并用于甲硝唑(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,催化剂的加入(0.5 g)对MNZ(C0=5 mg/L;pH=5.5)的氧化和矿化有明显改善,其中NiOx/AC催化剂表现出较好的催化活性,反应60 min后,MNZ和TOC的去除率分别达87%和30%,较AC催化臭氧氧化(80%和26%)及单独臭氧氧化(70%和10%)有所提高。叔丁醇或硝酸根的加入对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.