光催化-臭氧联用技术降解苯胺研究

研究了光催化-臭氧联用技术对苯胺废水的降解.结果表明,光催化-臭氧联用对苯胺的降解具有一定的协同效应,COD去除率大大高于单一光催化和单一臭氧的COD去除率,在较高苯胺初始浓度时效果更为显著,这是因为臭氧和光催化剂协同产生了更多的.OH.苯胺废水的初始pH和初始浓度对苯胺光催化-臭氧联用的降解效果影响不大,且COD去除率均能达到90%以上.另外,臭氧流量的增大能提高苯胺的降解效率并缩短降解时间.论证了在苯胺降解过程中有中间产物生成.

Study of degradation of aniline by combined photocatalysis and ozone

The degradation of aniline in aqueous solution by combined photocatalysis and ozone was studied. The experimental results indicate a synergic effect of photocatalysis and ozone on the decomposition of aniline. The removal rates of COD by combined photocatalysis and ozone are far more efficient than either of them above, especially under high level initial concentration, due to more hydroxyl radicals produced synergically by photocatalysis and ozone. The initial pH and aniline concentration in aqueous solution have little influence on degradation by combined photocatalysis and ozone. And the removal rates of COD are all above 90 percent. In addition, increasing the flow of ozone can improve the efficiency and shorten the time of degradation. It is also confirmed that intermediates are produced in the process of degradation of aniline.