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Theoretical model for moisture adsorption on ionic liquids: A modified Brunauer-Emmet-Teller isotherm approach |
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| Authors: | J CarreteM García JR RodríguezO Cabeza LM Varela |
| Institution: | a Grupo de Nanomateriales y Materia Blanda, Departamento de Física de la Materia Condensada, Universidad de Santiago de Compostela, E-15782, Santiago de Compostela, Spain b Facultad de Ciencias, Universidad de A Coruña, Campus A Zapateira s/n, E-15008, A Coruña, Spain |
| Abstract: | The adsorption of atmospheric water on the air-liquid interface of ionic liquids is analyzed by means of a modified version of the Brunauer-Emmet-Teller (BET) multilayer adsorption isotherm including lateral interactions between adsorbed molecules, treated in a mean-field fashion. Recently reported experimental results of water adsorption on hydrophobic ionic liquids of the 1-alkyl-3-methyl imidazolium tetrafluoroborate (CnMIM-BF4) family are analyzed in the present theoretical framework. The calculated values of the lateral interaction are seen to be compatible with the Keesom dipole-dipole interaction in water, confirming the validity of the multilayer assumption hypothesis. A somehow surprisingly ordered hydrophilic-like adsorption of atmospheric water is suggested to take place in the free surface of hydrophobic ILs of the imidazolium family. |
| Keywords: | Ionic liquids Pseudolattice theory Adsorption isotherm Brunauer-Emmet-Teller Lateral interactions Hygroscopic Hydrophobic adsorption Hydrophilic adsorption |
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