Theoretical model for moisture adsorption on ionic liquids: A modified Brunauer–Emmet–Teller isotherm approach

Carrete, Jesús; García, M. Villegas; Rodríguez, Jorge; Cabeza, O.; Varela, Luis M.

doi:10.1016/j.fluid.2010.11.011

Cited by 18 publications

(13 citation statements)

References 27 publications

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“…11 The favorability of the water molecule–surface interaction depends on many factors. These include the surface area of the IL, 49 stirring which might alter the interfacial structure, the gas flow rate and its angle of incidence, the presence of small impurities (including other water molecules) within the IL which may enhance water sorption, 50,51 and the chemical nature 52 of the chosen IL. In our experiments humidified nitrogen gas was introduced perpendicular to the IL surface at a flow rate of 300 mL/min at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Adventitious Water Sorption in a Hydrophilic and a Hydrophobic Ionic Liquid: Analysis and Implications

2016

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The sorption of water in ionic liquids (ILs) is nearly impossible to prevent, and its presence is known to have a significant effect on the resulting mixtures’ bulk and interfacial properties. The so-called “saturation” water concentrations have been reported, but water sorption rates and mixing behaviors in ILs are often overlooked as variables that can significantly change the resulting mixtures’ physical properties over experimental time frames of several minutes to hours. The purpose of this work is to establish a range of these effects over similar time frames for two model ILs, protic ethylammonium nitrate (EAN) and aprotic butyltrimethylammonium bis(trifluoromethylsulfonyl)imide (N1114 TFSI), as they are exposed to controlled dry and humid environments. We report the water sorption rates for these liquids (270 ± 30 ppm/min for EAN and 30 ± 3 ppm/min for N1114 TFSI), examine the accuracy and precision associated with common methods for reporting water content, and discuss implications of changing water concentrations on experimental data and results.

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Section: Resultsmentioning

confidence: 99%

Adventitious Water Sorption in a Hydrophilic and a Hydrophobic Ionic Liquid: Analysis and Implications

2016

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“…A number of groups have investigated water vapour uptake by ionic liquids on a macroscopic level and attempted to relate such studies to surface effects. [136][137][138] This journal is c the Owner Societies 2012 Phys. Chem.…”

Section: Watermentioning

confidence: 99%

Influence of the ionic liquid/gas surface on ionic liquid chemistry

Lovelock

2012

Phys. Chem. Chem. Phys.

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Applications such as gas storage, gas separation, NP synthesis and supported ionic liquid phase catalysis depend upon the interaction of different species with the ionic liquid/gas surface. Consequently, these applications cannot proceed to the full extent of their potential without a profound understanding of the surface structure and properties. As a whole, this perspective contains more questions than answers, which demonstrates the current state of the field. Throughout this perspective, crucial questions are posed and a roadmap is proposed to answer these questions. A critical analysis is made of the field of ionic liquid/gas surface structure and properties, and a number of design rules are mined. The effects of ionic additives on the ionic liquid/gas surface structure are presented. A possible driving force for surface formation is discussed that has, to the best of my knowledge, not been postulated in the literature to date. This driving force suggests that for systems composed solely of ions, the rules for surface formation of dilute electrolytes do not apply. The interaction of neutral additives with the ionic liquid/gas surface is discussed. Particular attention is focussed upon H(2)O and CO(2), vital additives for many applications of ionic liquids. Correlations between ionic liquid/gas surface structure and properties, ionic liquid surfaces plus additives, and ionic liquid applications are given.

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“…to illustrate the water sorption by [CnMIM][BF 4 ] (n = 2, 4, 6, 8). 38 These models were based on limited experimental data, models based on more experimental data need to be developed and verified. The reports above are important and gave us rough knowledge of water sorption by ILs.…”

Section: Introductionmentioning

confidence: 99%

Water sorption in ionic liquids: kinetics, mechanisms and hydrophilicity

Cao

Chen

Sun

et al. 2012

Phys. Chem. Chem. Phys.

192

245

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Most of the ionic liquids (ILs) are hygroscopic in air. The effects of structural factors of ILs (cation, anion, alkyl chain length at cation, and C2 methylation at cation) and external factors (temperature, relative humidity, and impurity) on the kinetics of water sorption by 18 ILs were investigated. A modified two-step sorption mechanism was proposed to correlate the water sorption data in the ILs. Three type of parameters (sorption capacity, sorption rate and degree of difficulty to reach sorption equilibrium) based on the modified two-step mechanism were derived to comprehensively characterize the water sorption processes. These parameters have similar tendencies, providing an efficient way to evaluate them by one parameter that can be easily obtained. The hydrophilicity of the ILs was classified to four levels (super-high, high, medium, low) according to the water sorption capacity. The results show that cation of the ILs also plays an important role in water sorption, and the impurities affect the water sorption enormously. Acetate and halogen-based ILs have the highest hydrophilicity when combined with the imidazolium or pyridinium cation.

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Theoretical model for moisture adsorption on ionic liquids: A modified Brunauer–Emmet–Teller isotherm approach

Cited by 18 publications

References 27 publications

Adventitious Water Sorption in a Hydrophilic and a Hydrophobic Ionic Liquid: Analysis and Implications

Adventitious Water Sorption in a Hydrophilic and a Hydrophobic Ionic Liquid: Analysis and Implications

Influence of the ionic liquid/gas surface on ionic liquid chemistry

Water sorption in ionic liquids: kinetics, mechanisms and hydrophilicity

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