Abstract
Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6] Extraction of several chloro compounds from water has been examined. As the extracting liquid the 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6], which is common hydrophobic ionic liquid, was used. Additionally, extraction of selected chlorinated compounds from tert-butylmethylether (MTBE) was investigated. The obtained results show the usefulness of [BMIM][PF6] to remove the organic impurities from water, particularly at the concentration range inappropriate for biological purification plants.
Highlights
Ionic liquids (ILs) are organic compounds, containing large organic cation an organic or inorganic counterion
We have examined the possibility to extract the halogenated organic compounds from water using the hydrophobic ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6]
Study in the extraction of dyes into a room-temperature ionic liquid and their mechanisms
Summary
Ionic liquids (ILs) are organic compounds, containing large organic cation (predominantly imidazolium) an organic or inorganic counterion (usually Br-, Cl-, I-, PF6-, BF4-, CH3OSO3-, NTf2-). As a consequence some efforts to synthesize IL with crown ether moiety, as the dedicated metal extractant, have been made[12] This example shows the general topic of the research on ILs – there is a possibility to create dedicated compound, designed to carry out a specific process with the maximum efficiency. Some properties of [BMIM][PF6] at 25oC are as follows: surface tension 46.6 mN/m18, dynamic viscosity 0.207 Pa⋅s19, density 1370 kg/m3 20 and electrical conductivity 0.146 S/m21 It is stable compound, dissolving in solvents with a dielectric constant (ε) higher than 7, except for the water. Some serious drawback may be caused by the fact that PF6- anion may undergo hydrolysis to produce HF and PO43- in the acidic aqueous phase[22] The aim of this contribution was to investigate the application as a solvent for the removal of halogenated compounds from wastewater. It is a very important subject, when the concentration of contaminants is too high to apply the biological purification systems
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