Adsorption of imidazolium and pyridinium ionic liquids onto montmorillonite: characterization and thermodynamic calculations

Abstract : Five first generation ionic liquids (RTILs : BMImCl, OMImCl, AMImCl, BPyBr and OPyBr) were intercalated into the layered structure of a Na-montmorillonite by dispersion in aqueous solutions ([RTIL] ⩽ 20 mmol.L-1). For all ionic liquids, the intercalation expanded the spacing of the silicate layers, as measured by X-ray diffraction. FTIR, thermogravimetric analyses and sodium titrations of the solutions after intercalation proved the adsorption of the RTILs through a cation exchange mechanism. Adsorption isotherms, done at pH = 7 and at 25°C, displayed that the maximum adsorption capacity of the substrates was closely linked to the nature of the organic cation and the length of the alkyl chain (BPyBr > OPyBr ∼ AMImCl ∼ BMImCl > OMImCl). For the five RTILs, calculated parameters obtained from the adsorption isotherms studied at 3 temperatures (25°C, 40°C and 55°C) concluded to an endothermic and spontaneous adsorption reaction.
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L. Reinert, Khaled Batouche, Jean-Marc Lévêque, Fabrice Muller, Jean-Michel Bény, et al.. Adsorption of imidazolium and pyridinium ionic liquids onto montmorillonite: characterization and thermodynamic calculations. The Chemical Engineering Journal, Elsevier, 2012, 209, pp.13-19. ⟨10.1016/j.cej.2012.07.128⟩. ⟨insu-00723254⟩

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