摘要
对比了在有无Co2+催化剂存在时外加氯离子对Co/单过氧硫酸盐(Co/PMS)体系降解2,4,6-三氯苯酚(2,4,6-TCP)效果的影响,考察了不同浓度氯离子对2,4,6-三氯苯酚降解的动力学和总有机碳(TOC)的去除率.结果表明,氯离子对该体系降解2,4,6-三氯苯酚过程具有双重影响:在Co2+存在条件下参与自由基反应,但提高其浓度又明显抑制2,4,6-TCP矿化;在无Co2+存在条件下诱发非自由基反应,实现对氯酚的快速降解.通过气质联用(GC-MS)测定了反应的中间产物,并据此推断了降解的反应机理.
Effects of additional chloride ion on the degradation of 2,4,6-trichlorophenol（2,4,6-TCP） by Co（II）/peroxymonosulfate（Co/PMS） oxidation system in the presence and absence of Co2＋ were compared by measuring degradation kinetics and changes of total organic carbon（TOC） at different chloride concentrations.The results indicate that chloride ion has a dual effect on degradation of 2,4,6-trichlorophenol by Co/PMS system： 1） it is involved in sulfate radical-based reactions,but obviously inhibits the mineralization of 2,4,6-TCP with the increasing concentrations of chloride;2） it triggers non-radical reaction with PMS alone to degrade 2,4,6-TCP.Based on the intermediate products identified by GC-MS,a degradation mechanism of 2,4,6-TCP in Co/PMS/Cl-system was proposed.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2013年第1期51-56,共6页
Journal of Wuhan University:Natural Science Edition
基金
国家自然科学基金(41073060
21007009
41273108)
上海市重点学科建设项目(B604)
上海市"晨光"计划资助项目(10CG34)
关键词
硫酸根自由基
氯离子
双重作用
矿化
中间产物
动力学
2
4
6-三氯苯酚
sulfate radical
chloride ions
dual effect
mineralization
intermediate products
kinetics
2
4
6-trichlorophenol
