Adsorption Kinetics at Silica Gel/Ionic Liquid Solution Interface
| Autor: | Anna Groszek, Małgorzata Tatarczak-Michalewska, Eliza Blicharska, Jolanta Flieger, Ryszard Kocjan |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
sorption kinetics
Acetonitriles Inorganic chemistry Pharmaceutical Science Article Analytical Chemistry ionic liquids silica gel pseudo-second-order equation lcsh:QD241-441 chemistry.chemical_compound Adsorption Halogens lcsh:Organic chemistry Drug Discovery Physical and Theoretical Chemistry Acetonitrile Aqueous solution Silica gel Methanol Organic Chemistry Solid Phase Extraction Imidazoles Solvent Chaotropic agent Kinetics chemistry Chemistry (miscellaneous) Ionic liquid Molecular Medicine Thermodynamics Pyridinium |
| Zdroj: | Molecules; Volume 20; Issue 12; Pages: 22058-22068 Molecules Volume 20 Issue 12 Pages 22058-22068 Molecules, Vol 20, Iss 12, Pp 22058-22068 (2015) |
| ISSN: | 1420-3049 |
| DOI: | 10.3390/molecules201219833 |
| Popis: | A series of imidazolium and pyridinium ionic liquids with different anions (Cl(-), Br(-), BF₄(-), PF₆(-)) has been evaluated for their adsorption activity on silica gel. Quantification of the ionic liquids has been performed by the use of RP-HPLC with organic-aqueous eluents containing an acidic buffer and a chaotropic salt. Pseudo-second order kinetic models were applied to the experimental data in order to investigate the kinetics of the adsorption process. The experimental data showed good fitting with this model, confirmed by considerably high correlation coefficients. The adsorption kinetic parameters were determined and analyzed. The relative error between the calculated and experimental amount of ionic liquid adsorbed at equilibrium was within 7%. The effect of various factors such as initial ionic liquid concentration, temperature, kind of solvent, kind of ionic liquid anion and cation on adsorption efficiency were all examined in a lab-scale study. Consequently, silica gel showed better adsorptive characteristics for imidazolium-based ionic liquids with chaotropic anions from aqueous solutions in comparison to pyridinium ionic liquids. The adsorption was found to decrease with the addition of organic solvents (methanol, acetonitrile) but it was not sensitive to the change of temperature in the range of 5-40 °C. |
| Databáze: | OpenAIRE |
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