School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China.
School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China.
Sci Total Environ. 2017 Dec 15;603-604:361-369. doi: 10.1016/j.scitotenv.2017.06.059. Epub 2017 Jun 23.
The treatment of two typical UV filters benzophenone-4 (BP4) and benzophenone-9 (BP9) was evaluated in aqueous solutions by UV/HO process. High-resolution accurate mass spectrometry (HRMS) was used to identify the degradation intermediates. A total of 12 BP4 degradation products and 17 BP9 degradation products were identified. A series of OH-initiated reactions, including hydroxylation, dihydroxylation, decarboxylation, demethylation, and ring breaking, lead to the final mineralization of BP4 and BP9. The degradation mechanisms of BP4 and BP9 are also proposed, separately. Toxicity prediction and assessment indicate that the bio-toxicity of the intermediates is higher, even if the parent compounds are completely transformed. It is necessary to further assess the environmental risk of BP4, BP9 and their intermediates in engineered systems and ambient aquatic environments.
采用 UV/HO 工艺在水溶液中评价了两种典型的紫外线滤光剂二苯甲酮-4（BP4）和二苯甲酮-9（BP9）的处理效果。利用高分辨率精确质量质谱（HRMS）对降解中间产物进行了鉴定。共鉴定出 12 种 BP4 降解产物和 17 种 BP9 降解产物。一系列 OH 引发的反应，包括羟化、二羟化、脱羧、脱甲基和断环，最终导致 BP4 和 BP9 的完全矿化。还分别提出了 BP4 和 BP9 的降解机制。毒性预测和评估表明，即使母体化合物完全转化，中间产物的生物毒性也更高。有必要进一步评估工程系统和自然水生态环境中 BP4、BP9 及其中间产物的环境风险。
