热活化过硫酸盐降解氧氟沙星特性及响应面优化

Degradation of Ofloxacin by Thermally Activated Persulfate and Its Response Surface Optimization

为了探究热活化过硫酸盐(PS)技术对水中氧氟沙星(OFX)的氧化降解作用,考察了反应温度、体系的初始pH、PS的初始浓度、OFX的初始浓度对OFX降解效果的影响;并在单因素实验的基础上,选取反应时间、体系的初始pH、PS的初始浓度和OFX的初始浓度4个因素进行了响应面优化实验。结果表明:最佳降解条件为,反应温度60℃、PS初始浓度4.0 mmol/L、pH=4.7、OFX初始浓度0.03 mmol/L、反应时间60 min,此时OFX的降解率为81.29%;4个因素对热活化PS降解OFX均有影响,其影响显著性从大到小为反应时间、OFX的初始浓度、PS的初始浓度、初始pH。利用响应曲面法模拟出反应体系的最佳条件,经实验验证,OFX降解率为93.78%,与预测最佳结果95.00%基本相符,表明模型可靠有效。

In order to explore the treatment of ofloxacin(OFX) pollutants by thermally activated persulfate(PS) technology in water, the effects of the reaction temperature, initial pH of the system, initial concentration of PS, and the initial concentration of OFX on its degradation were studied. And based on the single factor experiment, the response surface optimization experiment was carried out by selecting four factors: Reaction time, initial pH of the system, initial concentration of PS, and the initial concentration of OFX. The results showed that the optimal reaction conditions were as follows: The reaction temperature was 60 ℃, 4.0 mmol/L PS, pH=4.7, 0.03 mmol/L OFX, and the degradation rate of OFX was 81.29% in 60 minutes. All the four factors had an effect on the degradation of OFX, and the significance of its effect from large to small was the reaction time, initial concentration of OFX, initial concentration of PS, and the initial pH. The degradation rate of OFX under optimal conditions was 93.78%, which was basically consistent with the best predicted result of 95.00%, indicating that the model was reliable and effective.