Citation: Dong Xiuyan, Ruan Wenjing, Shen Jingwen, Shang Yazhuo, Liu Honglai. Properties of Aqueous Two-Phase System of Catanionic Surfactant/Ionic Liquid[J]. Chemistry, ;2016, 79(10): 936-941. shu

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

1.
Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai 200237

Corresponding author: Shang Yazhuo,
Received Date: 6 April 2016
Available Online: 18 May 2016
Fund Project:

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/H₂O, 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%.
- Ionic liquid,
- Surfactant,
- Aqueous two-phase systems,
- Extraction efficiency
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