UV 照射和 UV/O3 对水中 N-亚硝基二乙胺降解的比较：效率、产物和机制。
Comparison of N-nitrosodiethylamine degradation in water by UV irradiation and UV/O3: efficiency, product and mechanism.
机构信息
State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100021, China. xbb
出版信息
J Hazard Mater. 2010 Jul 15;179(1-3):976-82. doi: 10.1016/j.jhazmat.2010.03.100. Epub 2010 Mar 31.
N-nitrosodiethylamine (NDEA) is a member of nitrosamines, which is strong carcinogenic. In order to explore an effective treatment method for NDEA removal from water, sole UV irradiation and UV/O(3) were carried out in this study. The removal efficiency, degradation products and pathways were compared between those two processes. Results showed that NDEA removal efficiency achieved 99% within 15 min by both UV and UV/O(3). Degradation reaction well followed pseudo-first-order kinetics. Water pH had different effect on NDEA degradation in those two processes. Acidic and neutral conditions were good for NDEA degradation by sole UV irradiation. However, NDEA underwent rapid degradation under various pH conditions in the UV/O(3) process. Though the ozone introduction in the UV/O(3) process had little effect on NDEA degradation efficiency, it had significant effect on its degradation products and pathways. Methylamine, dimethylamine, ethylamine and diethylamine were observed as aliphatic amine products of NDEA degradation in both two processes. They were assumed to arise due to N-N bond fission under UV irradiation, or due to the reaction of NDEA and hydroxyl radicals in the UV/O(3) process.
N-亚硝基二乙胺（NDEA）是亚硝胺类物质的一种，具有很强的致癌性。为了探索从水中去除 NDEA 的有效方法，本研究进行了单独的 UV 照射和 UV/O3 处理。比较了这两种工艺的去除效率、降解产物和途径。结果表明，单独 UV 照射和 UV/O3 处理在 15 分钟内均可将 NDEA 的去除效率达到 99%。降解反应符合准一级动力学。水的 pH 值对这两种过程中的 NDEA 降解有不同的影响。在单独 UV 照射的情况下，酸性和中性条件有利于 NDEA 的降解。然而，在 UV/O3 过程中，各种 pH 值条件下 NDEA 都迅速降解。尽管臭氧的引入在 UV/O3 过程中对 NDEA 的降解效率影响不大，但对其降解产物和途径有显著影响。在这两种过程中，都观察到 NDEA 降解生成的脂肪族胺产物有甲胺、二甲胺、乙胺和二乙胺。它们被认为是由于在 UV 照射下 N-N 键断裂，或者是由于 NDEA 和 UV/O3 过程中的羟基自由基反应而产生的。
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