• 关键词：臭氧氧化  全氟萘烷  两相臭氧化  降解  2,4-D

• 基金项目：江苏省高校自然科学基金(No.08KJB610004);浅水湖泊重点实验室开放基金(No.408127);国家水体污染控制与治理科技重大专项湖泊(No.2008ZX07101-003-004)

• 史震宇
• 南京师范大学, 地理科学院, 环境科学与工程系, 南京 210046

• 李时银
• 南京师范大学, 地理科学院, 环境科学与工程系, 南京 210046

• 陆继来
• 江苏省环境科学研究院, 南京 210036

• 邹敏
• 江苏省环境科学研究院, 南京 210036

• 张利民
• 江苏省环境科学研究院, 南京 210036

• 摘要：以水/载O₃有机溶剂(全氟萘烷)为新型两相臭氧氧化体系,研究了臭氧在全氟萘烷中的溶解度和稳定性,并以水体中2,4-二氯苯氧乙酸(2,4-D)为研究对象,考察了初始pH值、臭氧投加量、自由基抑制剂对两相臭氧氧化体系降解2,4-D效果的影响.结果表明:臭氧在全氟萘烷中有很高的溶解度和很好的稳定性;碱性pH环境有利于2,4-D的降解,随着水相初始pH的增加,2,4-D在水/载饱和O₃全氟萘烷两相体系中的去除率明显增加;随着初始全氟萘烷载O₃量与2,4-D物质的量比的增加,2,4-D总去除率明显增加;叔丁醇(20mg·mL^-1)对两相体系中2,4-D降解影响不显著.

• Abstract：Study was carried out for the removal of 2,4-Dichlorophenoxyacetic acid(2,4-D)from aqueous solution by using the two-phase ozonation system of water and perfluorodecalin organic solvent loaded with ozone.Perfluorodecalin has a high ozone stability and solubility.2,4-Dwas used to examine the efficiency of the two-phase ozonation system.During the experiments,effects of pH,the initial concentration of ozone,and free radical scavenger on the removal rate of 2,4-Dwere investigated.The results showed that the efficiency of two-phase ozonation increased with the increase of the initial pHin the water phase.Increasing the initial molar ratio of perfluorodecalin loaded O₃/2,4-Dhad a positive effect on the degradation of 2,4-Din the two-phase ozonation system.It was also observed that tert-butyl alcohol,a free radical scavenger,had no significant negative effect on the two-phase ozonation.

• Key words：ozonation  perfluorodecalin  two-phase ozonation  degradation  2,4-D

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