Understanding mercury extraction mechanism in ionic liquids
| Autor: | Pietro Di Profio, Nicoletta Spreti, Maria Vincenza Mancini, Raimondo Germani |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Ionic liquids Liquid–liquid extraction Mercury ion Salt effect Aqueous solution Inorganic chemistry Aqueous two-phase system Filtration and Separation Buffer solution Liquid-liquid extraction Analytical Chemistry Ion chemistry.chemical_compound chemistry Ionic liquid Microemulsion mercury ions Counterion ionic liquids |
| Popis: | In this paper the complete removal of mercury ions from aqueous solutions using hydrophobic ionic liquids in the absence of chelating agents is reported. Several parameters were studied; in particular, the anionic component of ionic liquid, the anion of the metal salt and the nature of the aqueous phase used to dissolve the mercuric salt were varied to understand the transfer mechanism of Hg(II) ions into “classical” imidazolium-based ionic liquid. Results seem to suggest that metal ion partition into 1-octyl-3-methylimidazolium salts involves neutral and/or anionic Hg(II) species and that the rate of the process is strongly dependent on the experimental conditions, such as the working temperature and the nature of the anionic component of the ionic liquid, of the buffer solution and of the counterion of Hg(II). Moreover, addition of inorganic salts, such as NaCl or NaBr, to the aqueous phase increases metal ion extraction rate, with more than 90% of metal ion being transferred into the organic phase within 30 min and total ion removal accomplished in just four hours. Salt effects could even overcome the high viscosity of the ionic liquid and then a simple method for large-scale Hg(II) extraction was developed. |
| Databáze: | OpenAIRE |
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