水体中不同形态氮对阿昔洛韦光解的影响
Photodegradation of acyclovir in aquatic environment: Effect of different forms of nitrogen
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摘要: 以350 W氙灯为太阳光模拟光源，探讨了水环境中不同形态氮（NO3-、NO2-和NH4+）对阿昔洛韦（ACV）光解的影响.结果表明，ACV在不同形态氮离子溶液中的光解符合一级动力学规律，NO3-和NO2-均促进ACV的光解，NH4+对ACV的光解基本无影响；在NO3-、NO2-存在下，加入异丙醇作为羟基自由基猝灭剂，显著抑制了ACV的降解，表明NO3-、NO2-在光照下产生了·OH参与ACV的氧化降解.同时模拟研究了水体处于不同pE值时，水中不同形态氮共存对ACV光解的复合影响.pE值增大，ACV的光解速率先增大后减小；当NO2-和NH4+共存时，对ACV的光解主要表现为NO2-的影响；当NO2-和NO3-共存时，两者对ACV的光解存在拮抗作用，说明其对ACV的光解不是简单的叠加.Abstract: Aqueous photolysis of acyclovir (ACV) using 350 W Xe lamp as simulated solar irradiation source was investigated in the presence of different forms (NO3-, NO2- and NH4+) of nitrogen. The results indicated that photodegradation of ACV in the solution of different forms of nitrogen ions followed pseudo-first-order kinetics. Nitrate and nitrite promoted photolysis of ACV. Ammonium ions had no influence on ACV photolysis. The photodegradation rate of ACV was significantly inhibited when an appropriate amount of isopropanol was added in the presence of nitrate or nitrite. This phenomenon manifested that hydroxyl radical was produced during the experiment and enhanced the degradation rate of ACV. Photodegradation of ACV was also investigated under diverse pE values. The photodegradation rate of ACV increased first then decreased with increasing pE values. Nitrite played a key role in the photolysis of ACV when it coexisted with ammonium. The antagonistic effect existed on the photolysis of ACV when nitrate coexisted with nitrite, which indicates it's effect on the photodegradation of ACV isn't simply additive.
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Key words:
- acyclovir /
- photodegradation /
- inorganic nitrogen /
- pE values /
- hydroxyl radical
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