氯离子对模拟太阳光活化过一硫酸氢钾氧化卡马西平的影响规律

研究了氯离子存在条件下模拟太阳光活化过一硫酸盐（PMS）催化氧化模型污染物卡马西平（CBZ）的效果及机理.结果表明，无氯离子存在时，光活化PMS在30 min内只能转化25%左右的CBZ；随着氯离子浓度的增加，PMS/氯离子光催化体系对CBZ的氧化速率也迅速增加.通过电子顺磁共振（EPR）测试、活性种捕获实验等方式确定了氯离子/PMS光催化体系是以HClO为主要的氧化活性种.在无氯离子存在时，光活化PMS以¹O₂活性种为主.随着氯离子浓度的增加，¹O₂的EPR信号强度逐渐减弱，表明PMS在光照下生成的¹O₂易与氯离子反应生成HClO.结合超高效液相色谱-质谱法对不同反应时间的中间产物进行分析，发现CBZ转化为氯代有机副产物.

Effect of chloride ion on oxidation of carbamazepine by simulated sunlight activation of peroxymonosulfate

The activation of peroxomonosulfate (PMS) by simulated sunlight to oxidize model pollutant carbamazepine (CBZ) in the presence of chloride ions was studied. The results showed that the photoactivated PMS could only oxidize about 25% of CBZ in 30 minutes. With increase of chloride ion concentration, the oxidation rate of CBZ enhanced obviously. It was determined that the main reaction species in chloride ion/PMS photocatalytic system was HClO by electron paramagnetic resonance (EPR) test and active species capture experiment. ¹O₂ played the primary role in the system without chloride ion. When the chloride ion concentration increased, the EPR intensity of ¹O₂ gradually weakened, indicating that PMS easily reacted with chloride ions to generate HClO. Combined with ultra-high performance liquid chromatography-mass spectrometry analysis in different reaction time, the intermediates, chlorinated organic by-products were detected.