【摘要】 考察了在模拟太阳光照射下,双氯芬酸初始浓度、pH值、光强、温度、丙酮和双氧水对双氯芬酸光解的影响,并通过淬灭实验初步探讨了双氯芬酸光解.结果表明,双氯芬酸的光降解过程符合准一级动力学方程.光解速率随着双氯芬酸初始浓度的降低、光强的增强以及温度的升高而增大.当pH值从3变化到5时,反应速率常数变大;pH值从5变到8时,反应速率常数变小,再继续增大pH值,反应速率常数增大.水环境中存在的双氧水和丙酮对双氯芬酸的光解具有促进作用.最后,通过淬灭实验表明双氯芬酸的光解过程包括直接光解以及通过活性氧物种进行的自敏化光解.更多还原

【Abstract】 The effect of aquatic environmental factors on the photodegradation of diclofenac under simulated sunlight was studied in this paper.The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases.The photodegradation rate was found to increase with increasing light intensity and temperature.The rate constant gradually increased when the pH increased from 3 to 5,decreased as the pH increased from 5 to 8,and finally increased when the pH increased further from 8 to 12.H2O2 promoted the photodegradation of diclofenac due to the formation of hydroxyl radicals,and triplet state photosensitizer acetone promoted the photodegradation of diclofenac due to 3DCF*.Scavenging experiments indicated that diclofenac underwent direct photolysis and selfsensitized photodegradation via reactive oxygen species.更多还原