臭氧催化氧化降解硝基苯的实验研究

The Experiment Study on Degradating Nitrobenzene by Catalytic Oxidation

文章采用催化臭氧氧化技术处理抽出的浓度较高的硝基苯等难降解有机物进行了研究。实验结果表明:在前期实验得出催化剂制备最佳条件下,即采用锰和铁的硝酸盐溶液(金属元素质量10%)浸渍二氧化硅,Mn:Fe浓度比3∶1,在450℃焙烧6小时,在50℃老化5小时,考察了臭氧/Mn-Fe/载体二氧化硅体系中,空气曝气、催化剂的吸附、初始浓度的增加、pH值等的影响。在Mn-Fe负载二氧化硅催化剂的催化臭氧氧化降解硝基苯过程可能遵循羟基自由基机理。

It has been studied that the catalytic ozonation to treat nitrobenzene and other non-degradation organic compound in ground water with their high concentration. The results of the experiment indicate that the best preparation process and optimization of catalysts was that the manganese nitrate and iron nitrate were dissolved to dip the activated alumina in 10 percent of mass concentration,the ratio of manganese to iron was3∶1,the calcination temperature was 450℃ with six hours and 50℃ with five hours.Diffused air aeration,adsorption of catalyst,increasing concentration and pH all have effect on this reaction system,the process of the catalytic ozonation with the SiO2 loaded by the manganese and the iron may follow to Hydroxy free radical mechanism。