Department of Chemical Engineering, University of Malaya, Malaysia.
J Hazard Mater. 2011 Nov 15;195:55-61. doi: 10.1016/j.jhazmat.2011.03.024. Epub 2011 Mar 15.
This study focuses on the role of a hydrophobic ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, BMIMNTf(2) in the preparation of emulsion liquid membrane (ELM) phase containing kerosene as solvent, Span 80 as surfactant, NaOH as internal phase and TOMAC (tri-n-octylmethylammonium chloride) a second ionic liquid as carrier. The first time used BMIMNTf(2) in ELM was found to play the role of a stabilizer. The emulsion prepared using BMIM NTf(2) has a long period of stability of about 7h (at 3% (w/w) of BMIMNTf(2)) which otherwise has a brief stability up to only 7 min. The stability of the emulsion increases with the increase in concentration of BMIMNTf(2) up to 3% (w/w). Nevertheless, with further increase in concentration of BMIMNTf(2), a reduction in the stability occurs. The extraction experiments were carried out after holding the ELM for 2h after the preparation and a removal efficiency of approximately 80% was obtained for Cr. The destabilization of the emulsion was studied by observing the change in the interface height. An empirical correlation for the stability of the emulsion has been proposed.
本研究关注的是疏水性离子液体 1-丁基-3-甲基咪唑双（三氟甲基磺酰基）亚胺，BMIM NTf(2) 在制备乳状液膜（ELM）相中的作用，其中溶剂为煤油，表面活性剂为 Span 80，内部相为 NaOH，载体为第二离子液体 TOMAC（三正辛基甲基氯化铵）。首次在 ELM 中使用 BMIM NTf(2) 发现它起到了稳定剂的作用。使用 BMIM NTf(2) 制备的乳状液具有长达约 7 小时的稳定期（在 BMIM NTf(2) 的浓度为 3%（w/w）时），否则其稳定期仅为 7 分钟。乳状液的稳定性随着 BMIM NTf(2) 浓度的增加而增加，最高可达 3%（w/w）。然而，进一步增加 BMIM NTf(2) 的浓度会导致稳定性降低。在制备后保持 ELM 2 小时后进行萃取实验，Cr 的去除效率约为 80%。通过观察界面高度的变化研究了乳状液的失稳情况。提出了一个用于乳状液稳定性的经验相关性。
