小球藻引发水中环丙沙星的光降解效能研究

Efficiency of ciprofloxacin photodegradation induced by chlorella in aqueous solutions

研究了小球藻引发水中环丙沙星的光降解、相同条件下藻液光致产生的自由基以及两者之间的关系.结果表明:环丙沙星的光降解率和自由基的产量随着藻浓度和藻破碎时间的增加而增大,藻液破碎时间大于20min时,环丙沙星降解率和自由基产量的增幅均减缓;小球藻超声功率为100W时,环丙沙星光降解率可达93.4%,此时自由基的产量也最大为313.4μmol/L,再增加破碎功率对两者均产生抑制作用.不管小球藻液的条件如何变化,其光致产生的自由基量和引发环丙沙星的光降解量均存在较好的线性相关性.

Chlorella induced ciprofloxacin photodegradation and free radicals production in aqueous solutions were investigated. Furthermore, the relationships between ciprofloxacin photodegradation and free radicals generation were studied. The results show that both the photodegradtion efficiency of ciprofloxacin and the production rate of free radicals positively correlated with either the chlorella concentration or the chlorella breaking time. However, when chlorella breaking time was set at 20 min or more, the ciprofloxacin photedegradtion efficiency and free radical production rate increased slowly. The maximum ciprofloxacin photedegradtion efficiency （93.4%） and the maximum free radicals production （313.41xmol/L） were obtained concurrently under a condition of 100W ultrasonic power for chlorella breaking. The extra increase of breaking power had adverse effects on ciprofloxacin photedegradtion and free radicals production. Regardless of the conditions of chlorella solutions, a linear correlation was observed between the amount of produced free radicals and the photodegradation efficiency at a significance level of about 0.1.