摘要:
以波长为254 nm的紫外杀菌灯为光源，研究了水溶液中消炎镇痛药物安替比林（PZ）的光降解行为；考察了初始pH值及水中其他物质对PZ光降解的影响，探讨了PZ光解机制，并分析其降解产物及光解途径。结果表明，安替比林的光降解遵循拟一级反应动力学规律，pH值变化对光解速率基本没有影响。安替比林直接光降解占主导作用，活性氧类物种（ROS）对安替比林间接光解基本没有贡献。腐殖酸对安替比林光降解有抑制作用，而NO-3，HCO-3，Cl-对安替比林光降解没有明显作用。GC-MS分析表明安替比林在紫外辐射下生成甲酰胺，乙酰胺，2-羟基吲哚-3-酮，2，4（1氢，3甲基）-喹唑啉二酮，1-甲基-2-羟基苯并咪唑，2-羟基苯并恶唑等一系列具有安替比林母体苯环结构的化合物，表明安替比林侧链上N—N键断裂导致其最终降解。
Abstract:
Photodegradation of phenazone in aqueous solutions was studied under UV-light (λ=254 nm). The influence of initial pH value and environmental substances in water was discussed, the photolysis mechanism, proposed products and possible photolysis pathways of phenazone were analyzed. The results show that the photolysis of phenazone is a pseudo first order reaction, and no dependence on pH is observed for the process. The direct photolysis of phenazone as a consequence of light absorption is predominant pathway for phenazone and the photolysis process is not obviously affected by reactive oxygen species (ROS). The results verify that with the presence of humic acid, the photodegradation rate of phenazone decrease, while the rate is not significantly affected by NO-3，HCO-3，Cl-. GC-MS analysis show that the primary photodegradation products are acetamide,formamide,2-hydroxyindole-3-ketone,2,4(1H,3methyl)-quinazolinedione,1-methyl-2-hydroxybenzimidazole,2-hydroxybenzoxazole, which has the structure of benzene ring, indicating that the N—N chemical bond in branch structure of phenazone cleavaged under UV-light induce the degradation of phenazone.
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