Ionic Liquids in Separation Techniques

In book: Applications of Ionic Liquids in Science and Technology
Source: InTech
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Available from: Anna Czajkowska
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    • "Extraction, which is one of the most popular methods of sample preparation including interferents removal and analytes preconcentration, is imperative in sample analysis. Because of negligible vapor pressure, non-Àammability and good solubility for organic compounds, ILs are useful in sample preparation and analytical chemistry [7] [8] , such as, liquid-liquid extraction (LLE) [9] [10] , liquid phase microextraction (LPME) [11] [12] , solid phase extraction (SPE) [13] and solid phase microextraction (SPME) [14] [15] [16] . Table 1 summarizes some representive examples of extractions of organic comtaminants in environmental samples. "
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    ABSTRACT: Ionic liquids (ILs) are used as promising alternatives for the traditional volatile organic solvents employed in separation process, due to their unique properties and good solubility for many different materials. It has been used as extraction solvents for a wide range of environmental contaminates. In this paper, the main applications of ILs in separation of organic pollutants for sample preparation and pollution controlling are reviewed, and the problems and challenges in this area are also described. (C) 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of National University of Singapore.
    Full-text · Article · Dec 2012
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    • "In bulk liquid membrane process, the viscosity of the membrane solvent was significant on governing the stripping rate due to its high membrane thickness. From the published data [14] [15] [16] [17] [31], the viscosity of ionic liquids studied are in the order of [Bmim][NTf 2 ] < [Bmim][FAP] < [Bmim][PF 6 ]. This was true for [Bmim] "
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    ABSTRACT: Room temperature ionic liquids show potential as an alternative to conventional organic membrane solvents mainly due to their properties of low vapor pressure, low volatility and they are often stable. In the present work, the technical feasibilities of room temperature ionic liquids as bulk liquid membranes for phenol removal were investigated experimentally. Three ionic liquids with high hydrophobicity were used and their phenol removal efficiency, membrane stability and membrane loss were studied. Besides that, the effects of several parameters, namely feed phase pH, feed concentration, NaOH concentration and stirring speeds on the performance of best ionic liquid membrane were also evaluated. Lastly, an optimization study on bulk ionic liquid membrane was conducted and the maximum phenol removal efficiency was compared with the organic liquid membranes. The preliminary study shows that high phenol extraction and stripping efficiencies of 96.21% and 98.10%, respectively can be achieved by ionic liquid membrane with a low membrane loss which offers a better choice to organic membrane solvents.
    Full-text · Article · Sep 2011 · Desalination
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    • "Physicochemical properties of selected ionic liquids (Berthod et al., 2008). "
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    ABSTRACT: Interest in ionic liquids (ILs) for their potential application in analytical chemistry continues to grow. Their usefulness can be due to favourable physicochemical properties, like the lack of vapour pressure, good thermal and chemical stability as well as very good dissolution properties regarding both organic and inorganic compounds. A specific feature of ILs is that these compounds provide strong proton donor-acceptor intermolecular interactions. As a result, ILs are able to affect on the hydroxy groups of the silica supports the most popular stationary phases in liquid chromatography (LC). It is well known that the hydroxy groups, called free or isolated silanols cause serious problems in LC, especially when separating basic compounds. This review focuses on the application of ILs in LC and capillary electrophoresis (CE) and comparisons of their efficiency with standard silanol suppressing additives to mobile phases.
    Full-text · Chapter · Feb 2011
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