过渡金属离子存在下零价铁还原亚硝基二甲胺

Reduction of N-nitrosodimethylamine with Zero-valent Iron in the Presence of Transition Metal Ions

研究了不同过渡金属离子存在下零价铁还原亚硝基二甲胺(NDMA)的效能,考察了关键影响因素(p H、DO质量浓度、转速)对镍离子(Ni^(2+))和铜离子(Cu^(2+))存在下零价铁还原NDMA还原效能的影响。分析了Ni^(2+)和Cu^(2+)存在下零价铁还原水中NDMA反应过程中的降解产物。结果表明:Ni^(2+)和Cu^(2+)可以有效地促进零价铁还原NDMA,反应去除率可达99%以上。水溶液为酸性和中性时,Ni^(2+)和Cu^(2+)的存在下零价铁还原NDMA的效能较高。溶解氧为正常与低浓度时,溶解氧对NDMA还原的影响较小,溶解氧浓度较高时会抑制Cu^(2+)存在下零价铁还原NDMA的反应。高转速时NDMA的去除速率较低。随着NDMA的降解,偏二甲肼(UDMH)和二甲胺(DMA)随之生成。

The reduction efficiency of N-nitrosodimethylamine（NDMA）with zero-valent iron in the presence of transition ions was studied.The effects of key influencing factors（pH value,DO concentration,rotating speed）on the reduction of N-nitrosodimethylamine（NDMA）with zero-valent iron in the presence of nickel ion（Ni^2＋）and copper ion（Cu^2＋）were investigated and the degradation products were analyzed.The results showed that Ni^2＋and Cu^2＋could effectively promote the reduction of NDMA with zero-valent iron.The removal efficiency could be more than 99%.The reduction efficiencies in the presence of Ni^2＋and Cu^2＋were higher when the water solution was acidic or neutral.The dissolved oxygen had little influence on NDMA reduction when the dissolved oxygen concentration was normal or low.The reduction of NDMA with zero-valent iron in the presence of Cu^2＋was inhibited when the concentration of dissolved oxygen was high.The removal rate was low when the rotating speed was high.1,1-dimethylhydrazine（UDMH）and dimethylamine（DMA）produced with the degradation of NDMA.