论文部分内容阅读
采用实验室制备的纳米CuO为催化剂,对水中痕量的对硝基氯苯(pCNB)进行催化臭氧氧化去除效能研究.考察了不同工艺条件、催化剂用量、溶液pH值、臭氧进气浓度以及叔丁醇等因素对有机物去除效能的影响.结果表明:在实验条件下,纳米CuO对臭氧氧化去除水中的pCNB具有明显的催化效果,12 min内,催化臭氧氧化对pCNB的去除率比单独臭氧氧化提高了28%.随着催化剂用量、pH值(3～11)和臭氧进气浓度的增加,pCNB去除率均增大.自由基抑制剂叔丁醇的加入使pCNB去除率明显降低,证明在纳米CuO催化臭氧化过程中pCNB的降解主要是由于羟基自由基的氧化作用.“,”Nano-CuO prepared in the lab was used as catalyst to enhance the ozonation for the removal of trace p-chloronitrobenzene (pCNB) in water. The experiments were carried out to investigate the effects of different process conditions, the amount of catalyst, pH value, ozone gas concentrations and tert-butanol on the degradation efficiency of pCNB. Results showed that under the present experimental conditions, the presence of nano-CuO could improve the ozonation for removal of pCNB, namely the removal efficiency of pCNB was increased by 28% compared to the case of ozonation alone within the 12 min treatment. With the increase of the amount of catalyst, pH value (3 ?11) and ozone gas concentrations, the removal efficiency of pCNB increased, respectively. It was found that the removal efficiency of pCNB decreased as the concentration of tert-butanol increased in the process of catalytic ozonation , indicating that the degradation of pCNB is mainly contributed to the oxidation of hydroxyl radicals in the nano-CuO catalytic ozonation process.