在钴/氧化铝(Co/Al_2O_3)上臭氧催化降解水体中痕量N-亚硝基二甲胺(NDMA)

在实验室的间歇反应器中研究了在Al_2O_2和Co/Al_2O_3催化剂上臭氧催化降解水体中N-亚硝基二甲胺(NDMA)的效果,结果表明两种催化剂的添加显著地提高了NDMA的降解效率。主要试验参数的研究表明:Co/Al_2O_3的投加量、臭氧的投加量、温度等试验参数对于降解率有很大影响;当单位体积溶液中催化剂Co/Al_2O_3的投加量为167 mg/L、臭氧的投加量为3 mg/L时可以获得最佳的降解效果。随着温度的升高,NDMA降解去除率逐渐升高,当反应温度由283 K升高到323 K时,在Al_2O_3和Co/Al_2O_3上NDMA的降解效率分别由17.4%、55.4%提高到69.4%、82.5%。另外,在催化剂上添加K元素可明显提高Co/Al_2O_3臭氧催化降解NDMA的效率。

Catalytic Ozonation on Cobolt /Aluminum Oxide(Co /Al2O3)for the Degradation of Trace N-Nitrosodimethylamine(NDMA)Micropullutants in Aqueous Solution

Catalytic ozonation of NDMA in aqueous solution was carried out in a batch laboratory reactor where A1203 and Co/Al2O3 were used as the catalysts. The presence of the two catalysts significantly improve the degradation efficiency of NDMA. The research on some of the main operating parameters shows that the dosage of Co/Al2O3, the applied dosage of ozone and the temperature greatly affect the degradation efficiency of NDMA; the optimal dosage of Co/Al2O3 is 167 mg/L and the optimal applied ozone dosage is 3 mg/L; the degradation efficiency of NDMA increases with the temperature, and it rises from 17.4 % to 69.4 % in AAl2O3process and from 55.4% to 82.5 % in Co/Al2O3 process when the temperature increases from 283 K to 323 K. The addition of metal K favors the catalytic activity.