中文摘要：

以唑类抗菌药氟康唑为模型化合物,考察了其在纯水中的光降解动力学和光化学反应类型,发现模拟日光（λ〉290nm）照射下氟康唑未发生光解,在UV-vis（λ〉200 nm）光照下,氟康唑发生了光降解并服从准一级反应动力学.采用活性氧物种猝灭实验和竞争动力学方法,研究发现氟康唑发生了直接光解和·OH参与的自敏化光解,氟康唑与.OH的反应速率常数为（5.95±0.58）×109L·（mol·s）-1,表层水体中相应的半减期为（32.41±3.16）h·通过鉴定光解产物,得知氟康唑发生了脱氟、光致水解、光氧化等光化学反应.

英文摘要：

This study selected the azole fungicide fluconazole as a model compound,and investigated its photodegradation kinetics and photoreaction types in pure water.It was found that under UV-vis irradiation（λ200 nm）,the fluconazole photodegraded fast and followed the pseudo-first-order kinetics,whereas under simulated sunlight（λ290 nm）,photodegradation did not occur.The ROS scavenging experiments and competition kinetic examination indicated that the compound underwent both direct photolysis and self-sensitized photooxidation via ·OH other than1 O2.The bimolecular rate constant for the reaction between fluconazole and ·OH was（5.95±0.58）×109 L·（mol·s）-1,and the corresponding environmental half-life was calculated to be（32.41±3.16） h in surface waters.Furthermore,it was deduced from the photodegradation product identification that the UV-vis degradation pathways involved photoinduced defluorination,hydrolysis and photooxidation.