【摘要】 采用浸渍法制备了Fe₂O₃负载活性炭（Fe₂O₃/AC）催化剂,考察了Fe₂O₃/AC催化臭氧氧化草酸的活性以及天然水体主要本底成分对Fe₂O₃/AC催化臭氧氧化草酸的影响.结果表明,臭氧氧化草酸过程中Fe₂O₃/AC显示了良好的催化活性,草酸的去除主要基于催化贡献.HCO₃^-、CO₃^2-及腐殖酸对Fe₂O₃/AC催化臭氧氧化草酸均有抑制作用.加入HCO₃^-和CO₃^2-使催化臭氧氧化草酸体系pH升高,进而降低Fe₂O₃/AC催化臭氧氧化草酸的活性.此外,HCO₃^-和CO₃^2-也是羟基自由基抑制剂,HCO₃^-、CO₃^2-对草酸去除的抑制作用从侧面验证了Fe₂O₃/AC催化臭氧氧化草酸遵循羟基自由基机理.腐殖酸加入体系后,与草酸形成竞争吸附和竞争氧化,从而抑制草酸的降解.更多还原

【Abstract】 The aim of this research was to investigate catalytic activity of Fe₂O₃ loaded activated carbon catalyst（Fe₂O₃/AC） prepared by the dipping method,and the effect of background constituents on catalytic ozonation of oxalic acid.The results indicated that Fe₂O₃/AC showed good activity in ozonation of oxalic acid,and the removal of oxalic acid was mainly based on catalytic contribution.Some background constituents such as HCO₃^-,CO₃^2- and humic acid could cause the inhibition of oxalic acid degradation in Fe₂O₃/AC catalytic ozonation.The addition of HCO₃^-,CO₃^2- increased the pH value of system,and therefore the activity of Fe₂O₃/AC decreased.The inhibition of oxalic acid degradation indirectly proved that catalytic ozonation of oxalic acid in the presence of Fe₂O₃/AC followed the mechanism of hydroxyl radical oxidation.The humic acid competed with oxalic acid to be adsorbed and oxidized which led to the inhibition of oxalic acid degradation.更多还原