水/载O_3有机溶剂两相臭氧氧化法降解水体中2,4-二氯苯氧乙酸

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.

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

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.