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环境化学  2015 

模拟日光照射下三种抗生素的光降解行为

Keywords: 四环素,土霉素,红霉素,光降解

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Abstract:

选取四环素、土霉素、红霉素等3种国内普遍使用的抗生素,研究其在模拟日光(1.7kW氙灯,300nm≤λ≤400nm)下的降解动力学行为.结果表明,3种抗生素在模拟日光下均能发生光降解,3h的降解率分别达到66.87%、90.55%和92.80%.降解过程均符合准一级反应动力学方程,速率常数(k)分别为0.0064、0.0138min-1和0.0155min-1;半衰期(t1/2)分别为108.30、50.23、44.72min.采用LC-MS分析推断3种抗生素主要降解产物,探讨了它们可能的光解途径.

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