研究报告
何占伟,刘国光,刘海津,张楠,王刚.水体中不同形态氮对环丙沙星溶液光降解影响[J].环境科学学报,2011,31(11):2409-2415
水体中不同形态氮对环丙沙星溶液光降解影响
- The effect of different nitrogen forms on the photo-degradation of ciprofloxacin in water
- 基金项目：国家水体污染控制与治理科技重大专项(No. 2009ZX07211-005-03)
- 作者
- 单位
- 何占伟
- 河南师范大学 化学与环境科学学院,新乡 453007
- 刘国光
- 1. 河南师范大学 化学与环境科学学院,新乡 453007;
2. 广东工业大学 环境科学与工程学院,广州 510006
- 刘海津
- 河南师范大学 化学与环境科学学院,新乡 453007
- 张楠
- 河南师范大学 化学与环境科学学院,新乡 453007
- 王刚
- 河南师范大学 化学与环境科学学院,新乡 453007
- 摘要：研究了在模拟自然光照射条件下,环丙沙星在水相中的光降解行为,以及水中存在的无机氮对其光降解的影响.结果表明,随着环丙沙星初始浓度的增加,其光降解率逐渐降低;水中溶解氧的含量会影响其光解速率,水中溶解氧含量越高,环丙沙星光解速率越小;硝酸根对环丙沙星光降解起促进作用,亚硝酸根起抑制作用,铵根几乎没有影响.当环境pE值逐渐增加时,无机氮的形态经历了由NH4+到NO2-,再到NO3-的变化,相应地,环丙沙星的光降解速率先减小后增大.当硝酸根和铵根共存时,两者相互之间不会产生影响;当亚硝酸根和硝酸根共存时,环丙沙星的降解率小于理论降解率,说明亚硝酸根的存在抑制了硝酸根对环丙沙星光降解的促进作用.
- Abstract：This paper investigated the photo-degradation performance of Ciprofloxacin (CFX) under simulated solar irradiation and the effect of inorganic nitrogen in water. The results showed that the photo-degradation rate decreased with the increase of initial concentration of CFX and dissolved oxygen.Nitrate accelerated the photo-degradation rate whereas nitrite inhibited it, and ammonium had little effect on it. Along with the increase of pE value, nitrogen form changed from NH4+to NO2- or NO3-, the photo-degradation rate of CFX decreased at the beginning and increased afterwards. The experiments showed that there was no interaction between NH4+ and NO3-.When NO3-and NO2- coexisted, the photo-degradation rate of CFX was lower than the theoretic rate, which indicated that the facilitation of NO3- was inhibited because of the existence of NO2-.
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