紫外光降解水中亚硝基二乙胺

被引：4

作者：

徐冰冰

陈忠林

齐飞

杨磊

机构：

[1] 城市水资源与水环境国家重点实验室,哈尔滨工业大学市政环境工程学院

来源：

科学通报 | 2008年 / 11期

关键词：

亚硝基二乙胺; 紫外光辐射; 二乙胺; 乙胺;

D O I：

暂无

中图分类号：

X703 [废水的处理与利用];

学科分类号：

083001 [环境科学];

摘要：

采用紫外光直接降解水中存在的亚硝基二乙胺(NDEA).结果表明,紫外光降解是一种能够有效去除水中NDEA的处理技术.NDEA的初始浓度对紫外光降解效能略有影响,紫外光降解水中NDEA的反应符合假一级反应动力学模型.水中腐殖酸对紫外光降解NDEA具有显著的抑制作用,且抑制作用随着腐殖酸浓度增大而增大.采用气相色谱-质谱联用仪和高效液相色谱对NDEA的降解产物进行定性与定量分析.甲胺□二甲胺、乙胺□二乙胺□亚硝酸盐和硝酸盐是紫外光降解NDEA的主要降解产物.溶液pH值对紫外光降解水中NDEA有很大的影响.酸性条件下,NDEA的光降解量子产率显著大于中性及碱性条件下的量子产率,NDEA的光降解速率随着溶液pH值的增大而减小.溶液pH的变化对NDEA的紫外光降解产物的生成量具有显著影响.乙胺□二乙胺和亚硝酸盐作为底物存在时,不仅会抑制NDEA的紫外光降解,同时还会影响到NDEA降解产物的生成量.根据对NDEA降解途径的研究可知,紫外光辐射下,N—N键断裂导致NDEA的最终降解,其中N—N键发生均裂生成产物乙胺,N—N键发生异裂则生成产物二乙胺和亚硝酸盐.

引用

页码：1350 / 1357

页数：8

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