正负离子表面活性剂/离子液体双水相性质研究  

Properties of Aqueous Two-Phase System of Catanionic Surfactant/Ionic Liquid

作　　者：董修言 阮文静[1] 沈敬文 尚亚卓[1] 刘洪来[1] Dong Xiuyan Ruan Wenjing Shen Jingwen Shang Yazhuo Liu Honglai(Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai 20023)

机构地区：[1]华东理工大学化学与分子工程学院结构可控先进功能材料及其制备教育部重点实验室,上海200237

出　　处：《化学通报》2016年第10期936-941,共6页Chemistry

基　　金：国家自然科学基金项目(21476072;91334203)资助

摘　　要：本文把短链离子液体(IL)四氟硼酸1-乙基-3-甲基咪唑鎓[C2mim]BF4引入正负离子表面活性剂十二烷基硫酸钠(SDS)和十二烷基三甲基溴化铵(DTAB)双水相体系(SDS/DTAB/H2O)中,研究了IL对双水相相图及相分离体系性质的影响。结果表明,[C2mim]BF4的阳离子性质是影响阴离子表面活性剂过量区域性质的主要因素,IL通过静电作用、氢键作用等改变体系中聚集体的形貌,最终导致阴离子双水相(ATPSa)的消失。IL的阴离子对阳离子双水相(ATPSc)区域性质起着决定作用;IL的盐效应引起的对表面活性剂混合胶束扩散双电层的压缩作用,不但促进胶团的形成,缩短了形成稳定胶团所需要的时间,加快了双水相的相分离速度,而且也造成了形成ATPSc所需DTAB含量的提高。IL的引入改变了ATPSc上、下相表面活性剂的组成及含量,使富含表面活性剂的上相中阳离子表面活性剂含量更高,进而提高了双水相的萃取性能,其上相对甲基橙的萃取效率可高达96.67%。The short-chain ionic liquid （IL） 1-ethyl-3-methylimidazolium tetrafluoroborate [ C2mim] BF4 was introduced into the surfactant aqueous two-phase system （ATPS） of DTAB/SDS/H20, the effect of IL on the phase diagram and the properties of phase separation was studied. The results showed that the cationic properties of the IL are the main factors that affect the excess regional nature of anionic surfactants. The morphology of aggregates in the system is changed by addition of IL, eventually leads to the disappearance of the ATPSa. IL＇s anions play a decisive role in the nature of ATPSc. The compression effect of the electric double layer of the mixed surfactant micelle that caused by salt effect of IL not only promoted the formation of micelles, shortened the time needed for the formation of stable micelles and thus speeded up the phase separation of system, but also increased the DTAB content needed for the formation of ATPSc. The introduction of IL changed the compositions of the coexisted two phases and increased the content of cationic surfactant of the surfactant enriched upper phase, which endowed the ATPSc more excellent extraction property. The extraction efficiency of upper phase to methyl orange can reach to 96.67%.

关 键 词：离子液体 表面活性剂 双水相 萃取性能 

分 类 号：TQ423[化学工程]