Al2O3负载Mn-Fe-K金属氧化物催化臭氧氧化去除水中三种内分泌干扰物的研究

采用Al2O3负载Mn-Fe-K金属氧化物催化臭氧化技术研究了水中2,4-D、甲草胺和对硝基甲苯三种内分泌干扰物的去除效能。探讨了溶液pH值、不同臭氧投加量、催化剂用量、叔丁醇以及混合体系对有机物去除效能的影响。在同等实验条件下,催化臭氧氧化对2,4-D、甲草胺和对硝基甲苯的去除率分别为48.9%、64.0%和80.8%。随着温度、pH值(<9)、催化剂量的增加,2,4-D、甲草胺和对硝基甲苯的去除率均随着增大,但当pH值>9时,去除率随着pH值升高而有所减小。加入自由基抑制剂叔丁醇后各去除率均降低,表明其催化臭氧氧化过程均遵循羟基自由基机理。混合体系有利于有机污染物的去除率增加。

Degradation of three kinds of endocrine disruptors in water by catalytic ozonation

Catalytic ozonation of three kinds of endocrine disruptors with Al2O3supported Mn-Fe-K oxides catalyst was investigated in water. Effects of temperature, pH, catalyst dose, t-butanol and mixed system were also examined. The experimental results showed that the removal rates of three kinds of endocrine disruptors were 48.9%, 64.0% and 80.8% respectively. With the increase of temperature, pH(<9) and catalyst dose, the removal rates of three kinds of endocrine disruptors were increased, too. When pH was higher than 9 or inleted t-butanol, the removal rates were decreased. The catalytic ozonation follows a hydroxy radical pathway. The mixed system was profitable to degradation of three kinds of endocrine disruptors.