研究报告
陈平,刘国光,吕文英,李若白,姚琨,李富华,范斯娜.水环境中不同形态氮对甲芬那酸光降解影响机制的研究[J].环境科学学报,2015,35(10):3151-3156
水环境中不同形态氮对甲芬那酸光降解影响机制的研究
- Photodegradation of mefenamic acid in aquatic environment: Effect of different forms of nitrogen
- 基金项目：国家自然科学基金(No. 21377031)
- 作者
- 单位
- 陈平
- 广东工业大学环境科学与工程学院, 广州 510006
- 刘国光
- 广东工业大学环境科学与工程学院, 广州 510006
- 吕文英
- 广东工业大学环境科学与工程学院, 广州 510006
- 李若白
- 广东工业大学环境科学与工程学院, 广州 510006
- 姚琨
- 广东工业大学环境科学与工程学院, 广州 510006
- 李富华
- 广东工业大学环境科学与工程学院, 广州 510006
- 范斯娜
- 广东工业大学环境科学与工程学院, 广州 510006
- 摘要：研究了紫外光照射下水环境中不同形态的无机氮(NO3-、NO2-和NH4+)对甲芬那酸(MEF)光解的影响. NO3-与NO2-均促进MEF的光解,NH4+对MEF的光解基本无影响;在NO3-、NO2-存在下添加适量异丙醇,显著抑制MEF的降解,实验表明NO3-、NO2-在光照下产生了·OH并参与对MEF的氧化降解. 同时模拟研究了水体处于不同pE值下,水中存在的不同形态的无机氮对MEF光解的复合影响,其对MEF光解促进作用不是简单的叠加关系,增大pE值,MEF的光解速率先增大后减小. 当NO2-和NH4+共存时,对MEF的光解主要表现为NO2-的影响;当NO2-和NO3-共存时,两者对MEF的光解存在拮抗作用.
- Abstract：The impacts of different nitrogen forms (NO3-, NO2- and NH4+) on the photodegradation of mefenamic acid (MEF) were investigated in this study. The results showed that nitrate and nitrite promoted photodegradation of MEF. The ammonium ions had no influence on MEF photolysis. The photodegradation rate of MEF was significantly inhibited when an appropriate amount of isopropanol was added in the presence of nitrate or nitrite, which demonstrated that hydroxyl radical was produced during the experiment and enhanced the degradation rate of MEF. Photodegradation of MEF was also investigated under different pE values. The photodegradation rate of MEF increased first and then decreased. Nitrite played an important role on the photodegradation of MEF when it coexisted with ammonium. Nitrite had an obvious antagonistic effect on the photodegradation of MEF when it coexisted with nitrate.
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