正己烷萃取去除模拟阴-非混合表面活性剂土壤淋洗液中的重非水相液体  

REMOVAL OF DNAPLs FROM SIMULATED MIXED ANIONIC-NONIONIC SURFACTANT SOIL FLUSHING BY n-HEXANE SOLVENT EXTRACTION

作　　者：朱瑞佳[1] 赵保卫[1] 吴咏琪[1] 马婵媛[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《环境化学》2008年第6期791-794,共4页Environmental Chemistry

基　　金：国家自然科学基金(20577018);甘肃省中青年科技基金(3ZS042-B25-023);兰州交通大学"青蓝"人才工程项目资助

摘　　要：研究了利用正己烷液-液萃取去除阴-非混合表面活性剂土壤淋洗液中的重非水相液体(DNAPLs)的可行性及表面活性剂浓度、溶剂/水比例和无机盐等因素对去除率的影响.结果表明,利用正己烷作为溶剂可使氯苯(CB)从不同配比的十二烷基硫酸钠(SDS)和失水山梨聚氧乙烯醇醚(Tween 80)的混合表面活性剂(3∶1,1∶1,1∶3)溶液中有效的去除,去除率分别达87.2%—96.9%,94.4%—97.0%和95.9%—98.5%,表面活性剂浓度对去除效果没有显著影响;溶剂/水的比例增大,去除率增大,实验中选择油水比为1∶10;无机盐的存在可提高阴-非混合表面活性剂的增溶效果,但对去除效果没有影响.The paper studied the feasibility of removing dense nonaqueous phase liquids （DNAPLs） from simulated soil flushing by n-hexane liquid-liquid extraction, together with the effects of surfactant concentration, rations of solvent to water and inorganic salts on the removal rates. The results showed that n-hexane as solvent could effectively remove chlorobenzene from different mixed anionic-nonionic surfactant solutions （ 3 ： 1,1 ： 1,1 ： 3 ）, and the removal rates were 87.2%-96. 9% , 94.4%-97.0% and 95.9%-98.5% respectively. It was also concluded that removal rate was not changed with the suffactant concentrations, but enhanced along with the rations of solvent to water enhancement. Therefore the experiment adopted the rate of oil to water （O/W） was 1： 10. It was found that the effects of inorganic salts on removal rates were negligible, but the inorganic salts could enhance solubilization using mixed anionic-nonionic surfactant.

关 键 词：正己烷 萃取 阴-非混合表面活性剂 重非水相液体 

分 类 号：X53[环境科学与工程—环境工程]