摘要
目的探讨氯苯类化合物在CTMAB-高岭土上的吸附机理。方法采用一系列用阳离子表面活性剂CTMAB改性的有机高岭土对氯苯、1,4-二氯苯、1,2,4-三氯苯和1,2,4,5-四氯苯等4种氯苯类化舍物的吸附性能及机理进行研究。结果CBs在CTMAB-高岭土上的吸附等温线为线性;对于不同改性量的CTMAB-高岭土来说,CBs在CTMAB-高岭土上的Koc值基本为一常数,比其在土壤中的Koc值要高出许多;其Koc与CBs的辛醇-水分配系数呈正相关,而随CBs在水中溶解度的增大而降低。结论吸附过程主要是CBs在CTMAB-高岭土有机相中的分配作用所致。CT- MAB-高岭土对CBs的吸附能力与有机物本身的性质密切相关,这对受污染的土壤和地下水的修复工艺意义重大。
Aim To investigate the sorption mechanism of chlorobenzenes on CTMAB modified kaolinite. Methods Conducting sorption experiments to research the sorption mechanism of 4 chlorobenzenes （ CBs）, such as chlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and 1,2,4,5-tetrachlorobenzene, by CTMAB modified kaolinires. Results He sorption isotherms for CBs were nearly linear; the distribution coefficient Koc values of 4 CBs were relatively constant for different CTMAB-kaolinites, and were much larger than those on soils; the relationship between Koc on CTMAB-kaolinites and properties of CBs can be described as that Koc increases respectively with the increase of Kow and the decrease of their water solubilities. Conclusion CBs are patitioned into the organic phase created by the surfactant tails of the CTMAB modified kaolinite ; the Koc on CTMAB-kaolinites and properties of CBs are nearly related, which is very important for remediation technology of contaminated soils and groundwaters.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第1期75-79,共5页
Journal of Northwest University（Natural Science Edition）
基金
国家“863”计划基金(2006AA06Z356)
