Enhanced Catalytic Ozonation of Oxalic Acid over Modified Activated Carbon
改性活性炭强化催化臭氧氧化降解草酸

Industrial activated carbon(AC) was pretreated by acid solution and modified by nitration and amination.Its catalytic performance was investigated in a semi-batch reactor.After the acid pretreatment,the specific surface area,pHpzc and content of basic groups of AC were increased about 5%～10%,but its catalytic activity decreased 15.6%.The pHpzc and content of basic functional groups on the surface of AC-NH2 were increased from 2.6 and 234.8 mmol/g to 7.0 and 764.5 mmol/g,respectively.But all of them decreased after nitration.The modified AC samples were more active than the original AC and acid pretreated AC in the catalytic ozonation of oxalic acid at acid and neutral conditions.The degradation rate of AC-NH2 catalytic ozonation of oxalic acid was 42.4% in 45 min in the solution at pH=7.Catalytic ozonation of oxalic acid was inhabited by adding tert-butanol.This indicated that the modified activated carbon catalytic ozonation followed the hydroxyl radical reaction mechanism.