Lau T K, Chu W, Graham N
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Chemosphere. 2005 Aug;60(8):1045-53. doi: 10.1016/j.chemosphere.2005.01.022. Epub 2005 Feb 19.
The direct photolysis of an important endocrine disruptor compound, di-n-butyl phthalate (DBP), has been investigated under monochromatic UV irradiation at 254 nm over a wide pH range (3-11). The investigation was carried out under idealized conditions and has considered both reaction kinetics and the degradation mechanism. It was found that more than 90% of DBP can be degraded within an hour of irradiation in water. A simple model has been developed and used to predict the initial DBP photolysis rate constant at different pH values and initial DBP concentrations. The major decomposition mechanism of DBP is believed to involve the hydrolytic photolysis of the carbon in the alpha and/or beta-position of the ester chain with the production of aromatic carboxylic derivatives. Additionally, multi-degradation pathways are proposed for acid-catalyzed hydrolytic photolysis (pH 3-5), which was found to be useful in explaining the photo-degradation of DBP under acidic conditions. The use of 254 nm UV to photo-degrade DBP was found to be a relatively fast and clean process, especially in neutral to basic conditions.
在254 nm单色紫外光照射下，于较宽的pH范围（3 - 11）内，对一种重要的内分泌干扰化合物邻苯二甲酸二正丁酯（DBP）的直接光解进行了研究。该研究在理想化条件下开展，兼顾了反应动力学和降解机理。结果发现，水中的DBP在照射一小时内可降解90%以上。已建立一个简单模型，用于预测不同pH值和初始DBP浓度下的初始DBP光解速率常数。DBP的主要分解机理据信涉及酯链α和/或β位碳的水解光解，生成芳香族羧酸衍生物。此外，针对酸催化水解光解（pH 3 - 5）提出了多种降解途径，该途径被发现有助于解释酸性条件下DBP的光降解。研究发现，使用254 nm紫外光对DBP进行光降解是一个相对快速且清洁的过程，尤其是在中性至碱性条件下。
