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首页> 外文期刊>RSC Advances >Emulsion ionic liquid membranes (EILMs) for removal of Pb(II) from aqueous solutions
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Emulsion ionic liquid membranes (EILMs) for removal of Pb(II) from aqueous solutions

机译：用于从水溶液中去除Pb（II）的乳液离子液体膜（EILM）

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摘要

Ionic liquids (ILs) are playing increasingly important roles in the membrane separation processes. The present manuscript discusses the removal of Pb(II) ions from aqueous solution using an emulsion ionic liquid membrane (EILM) process. Initially, the emulsion liquid membrane (ELM) was prepared by stirring strip phase (sulphuric acid) and organic phase (surfactant: span 80, extractant: D2EHPA, diluent: hexane) together under high speed agitation. Note that, the parameters of the ELM process such as emulsification speed, pH of the feed phase, treat ratio, extractant and surfactant concentrations were studied for the maximum removal of Pb(II) ions. The role of IL was explored by adding hydrophobic IL, octylmethylimidazole hexafluorophosphine ([OMIM][PF6]), in the organic phase. The performance of ELM with and without IL was compared on the basis of stability, enrichment factor and the removal efficiency for Pb(II). The results showed that the percentage of Pb(II) extraction was complete by the emulsion membrane with IL (EILM) in comparison to the 97% achieved by neat ELM. Further, the stability and the enrichment factor of the EILM were found to be 2-3 times greater than that of the ELM. The FT-IR spectroscopic analysis revealed that bond interactions between IL and membrane phase components avoided the coalescence of internal phase droplets and enhanced the emulsion stability. The results obtained in this work support the use of the IL [OMIM][PF6] as both a stabilizer and carrier for the overall improvement of the ELM process.
机译：离子液体（ILs）在膜分离过程中扮演着越来越重要的角色。本手稿讨论了使用乳液离子液体膜（EILM）工艺从水溶液中去除Pb（II）离子的方法。最初，通过在高速搅拌下将汽提相（硫酸）和有机相（表面活性剂：span 80，萃取剂：D2EHPA，稀释剂：己烷）一起搅拌来制备乳液液膜（ELM）。注意，为了最大程度地去除Pb（II）离子，研究了ELM工艺的参数，例如乳化速度，进料相的pH，处理比例，萃取剂和表面活性剂浓度。通过在有机相中加入疏水性IL，辛基甲基咪唑六氟膦（[OMIM] [PF6]）来探索IL的作用。根据稳定性，富集因子和对Pb（II）的去除效率，比较了有无IL的ELM的性能。结果表明，与纯ELM相比，含IL（EILM）的乳化膜可完成Pb（II）萃取的百分比，而后者为97％。此外，发现EILM的稳定性和富集因子比ELM的高2-3倍。 FT-IR光谱分析表明，IL和膜相组分之间的键相互作用避免了内相液滴的聚结并提高了乳液的稳定性。在这项工作中获得的结果支持将IL [OMIM] [PF6]用作稳定剂和载体，以全面改善ELM工艺。

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