水/载O3有机溶剂两相臭氧氧化法降解水体中2,4-二氯苯氧乙酸  

Removal of 2,4-Dichlorophenoxyacetic acid from aqueous solution by a two-phase ozonation system of water/ozone-loaded organic solvent

作　　者：史震宇[1] 李时银[1] 陆继来[2] 邹敏[2] 张利民[2] 

机构地区：[1]南京师范大学、地理科学院、环境科学与工程系,南京210046 [2]江苏省环境科学研究院,南京210036

出　　处：《环境科学学报》2010年第6期1199-1203,共5页Acta Scientiae Circumstantiae

基　　金：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)~~

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.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-D was 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-D were investigated.The results showed that the efficiency of two-phase ozonation increased with the increase of the initial pH in the water phase.Increasing the initial molar ratio of perfluorodecalin loaded O3/2,4-D had a positive effect on the degradation of 2,4-D in 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.

关 键 词：臭氧氧化 全氟萘烷 两相臭氧化 降解 2 4-D 

分 类 号：X131[环境科学与工程—环境科学]