氯离子对钴/单过氧硫酸盐体系降解2,4,6-三氯苯酚的影响

氯离子对钴/单过氧硫酸盐体系降解2,4,6-三氯苯酚的影响 Effects of Chloride Ions on Degradation of 2,4,6-Trichlorophenol by Co（Ⅱ）/Peroxymonosulfate（Co/PMS） System 徐蕾 XU Lei 1 first-author 袁瑞霞 YUAN Ruixia 1 郭耀广 GUO Yaoguang 1 肖冬雪 XIAO Dongxue 1 王兆慧 WANG Zhaohui 1 柳建设 LIU Jianshe 1 东华大学环境科学与工程学院 东华大学环境科学与工程学院 College of Environmental Science and Engineering,Donghua University College of Environmental Science and Engineering,Donghua University 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. 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 10.14188/j.1671-8836.2013.01.010 X703 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） 2013-01-01 2021-04-01 1 59