采用碱活化过一硫酸盐（peroxymonosulfate，PMS）对水中三氯生（Triclosan，TCS）进行降解，考察了PMS浓度、pH、温度、共存离子和腐殖酸（HA）等对碱/PMS体系处理效果的影响，探究了体系主导自由基和TCS降解路径。结果表明，在PMS浓度为3 mmol/L、pH为10和温度为30℃的条件下反应3 h，初始质量浓度为5 mg/L的TCS降解率可达96.94%；Cl^-对TCS的降解表现为低质量浓度抑制高质量浓度促进，NO₃^-和H₂PO₄^-对TCS降解有促进作用，CO₃^2-和HA则抑制TCS的降解。自由基捕获实验确定了碱/PMS体系的主导活性氧物种为单线态氧（¹O₂）和超氧自由基（O₂^·-）。LC-MS/MS鉴定了13种主要中间体，并提出了羟基化、醚键断裂、脱氯和开环4种相关反应途径。

Triclosan in water is degraded by alkali activated peroxymonosulfate (PMS).The effect of PMS concentration, pH, temperature, co-existing ions and humic acid on the treatment effect of alkali/PMS system are investigated.The degradation pathways of triclosan and free radicals in this system are explored.Results show that the degradation rate of triclosan with an initial concentration of 5 mg·L^-1 can reach 96.94% in 3 h of reaction when PMS concentration is 3 mmol·L^-1, pH is 10 and the temperature is 30℃.Cl^- inhibits the degradation of triclosan at low concentration and promotes the degradation at high concentration.Both NO₃^- and H₂PO₄^- promote the degradation of triclosan.Both CO₃^2- and humic acid inhibit the degradation of triclosan.The dominant reactive oxygen species in this system are identified as singlet oxygen (¹O₂) and superoxide radical (O₂^·-) through free radical trapping experiments.Thirteen intermediates are identified by means of LC-MS/MS, and four related reaction pathways are proposed, including hydroxylation, ether bond breaking, dechlorination and ring opening.

何娜(1998-),女,硕士生,研究方向为水污染控制,3167563852@qq.com