Department of Environmental Engineering, YIEST, Yonsei University, 234 Maeji, Heungup, Wonju 220-710, Republic of Korea.
J Water Health. 2010 Jun;8(2):290-8. doi: 10.2166/wh.2009.301. Epub 2009 Nov 10.
The degradation of diethyl phthalate (DEP) in an aqueous solution during ozonation was investigated by identifying the oxidation intermediates using GC-MS. The experiments were carried out in semi-batch mode with a 1.5 mg l(-1)-min ozone dose. The proposed degradation pathways were divided into hydrolysis of the aliphatic chain (pathway (A)) and hydroxylation resulting from OH attack in the aromatic ring (pathway (B)). With increasing ozone dose, the aromatic ring of DEP was opened and acidic compounds, such as malonic acid, succinic acid and glutaric acid were formed. In addition, the ozonation of DEP for 18 min induced hydrogen peroxide (H(2)O(2)) generation at levels six times higher than pure water. Of the intermediates indentified, phthalic acid (PA) and phthalic anhydride (PAH) enhanced the degradation of DEP by promoting ozone decomposition.
采用 GC-MS 对邻苯二甲酸二乙酯（DEP）在水溶液中臭氧化过程的氧化中间产物进行了鉴定，研究了其降解情况。实验采用半分批式进行，臭氧化剂量为 1.5mg·L(-1)·min。提出的降解途径可分为脂肪链的水解（途径（A））和芳香环中 OH 攻击导致的羟基化（途径（B））。随着臭氧剂量的增加，DEP 的芳香环被打开，形成了丙二酸、琥珀酸和戊二酸等酸性化合物。此外，DEP 的臭氧化 18 分钟后产生的过氧化氢（H(2)O(2)）水平比纯水高 6 倍。在所鉴定的中间产物中，邻苯二甲酸（PA）和邻苯二甲酸酐（PAH）通过促进臭氧分解来增强 DEP 的降解。
