The degradation of the pharmaceutical compound ibuprofen (IBP) in aqueous solution induced by direct photolysis (UV-A and UV-C radiation) and photocatalysis (TiO2/UV-A and TiO2/UV-C systems) was evaluated. Initially, we observed that whereas photocatalysis (both systems) and direct photolysis with UV-C radiation were able to cause an almost complete removal of IBP, the mineralization rates achieved for all the photodegradation processes were much smaller (the highest value being obtained for the TiO2/UV-C system: 37.7%), even after an exposure time as long as 120 min. Chemical structures for the by-products formed under these oxidative conditions (11 of them were detected) were proposed based on the data from liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS) analyses. Taking into account these results, an unprecedented route for the photodegradation of IBP could thus be proposed. Moreover, a fortunate result was achieved herein: tests against Artemia salina showed that the degradation products had no higher ecotoxicities than IBP, which possibly indicates that the photocatalytic (TiO2/UV-A and TiO2/UV-C systems) and photolytic (UV-C radiation) processes can be conveniently employed to deplete IBP in aqueous media. Copyright © 2014 John Wiley & Sons, Ltd.
我们评估了直接光解(UV-A 和 UV-C 辐射)和光催化(TiO2/UV-A 和 TiO2/UV-C 系统)诱导的
水溶液中药物化合物
布洛芬(IBP)的降解情况。我们初步观察到,虽然光催化(两种体系)和紫外线-C 辐射直接光解能够几乎完全去除 IBP,但所有光降解过程的矿化率都要小得多(TiO2/UV-C 体系的矿化率最高:37.7%),即使暴露时间长达 120 分钟。根据
液相色谱耦合高分辨质谱(LC-HRMS)分析的数据,提出了在这些氧化条件下形成的副产品(检测到 11 种)的
化学结构。考虑到这些结果,可以提出一种前所未有的 IBP 光降解途径。此外,本研究还取得了一项幸运的结果:对盐藻的测试表明,降解产物的生态毒性并不比IBP高,这可能表明光催化(TiO2/UV-A和TiO2/UV-C系统)和光解(UV-C辐射)过程可以方便地用于去除
水介质中的IBP。Copyright © 2014 John Wiley & Sons, Ltd. All Rights Reserved.