光致氯生水合电子降解二甲基亚硝胺的研究

Research on the Degradation of Nitrosodimethylamine by Photo- induced Chlor- causing Hydrated Electron

采用紫外光致水合电子这一新型技术降解水中的痕量NDMA,初步研究了紫外光致水合电子对NDMA的降解效能,重点考察了NDMA的一级分解产物DMA、亚硝酸盐及硝酸盐进一步的降解情况,并与紫外直接光解进行比较。结果表明,与紫外直接光解相比,紫外光致水合电子不仅能加快NDMA本身的降解速率,还能有效地促使NDMA的分解产物进一步降解,从而达到控制NDMA的再生、降低水的化学风险的目的。这项研究对于彻底消除水中的二甲基亚硝胺污染具有一定的理论指导意义。

UV - induced hydrated electron is used for the degradation of NDMA in water. As the major degradation products of NDMA, DMA and nitrite are also the important precursors for NDMA and under certain conditions, DMA and nitrite are likely to regenerate NDMA again. So these products of NDMA degraded by UV - induced hydrated electron are investigated in this paper. The result shows that in the UV - induced hydrated electron system, the more effectual and thorough treatment for NDAM removal from water can be realized due to the reduction in formation of the DMA and nitrite. Compared with con- ventional methods, the possibility of NDMA regeneration can be controlled effectively by this method, which will be helpful for the ultimate degradation of NDMA in waste water.