Effects of pH and salinity on adsorption of different imidazolium ionic liquids at the interface of oil–water

Asadabadi, Simin; Saien, Javad

doi:10.1016/j.colsurfa.2015.10.021

Cited by 29 publications

(24 citation statements)

References 52 publications

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“…Also ionic liquids were characterized on oil/water interfaces. 13 Mixtures of surfactants 14−17 and mixtures of particles with surfactants were studied at water/oil interfaces. 18,19 One of the most challenging investigations was the measurement of the mass transfer across water/oil interfaces 20,21 to determine the partitioning coefficient of surfactants between water and the oil phase.…”

Section: ■ Introductionmentioning

confidence: 99%

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Fainerman¹,

Aksenenko

Makievski³

et al. 2019

Langmuir

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A two-component interfacial layer model was employed to describe the experimental results obtained for various surfactants. In contrast to the previous works, here it is shown that the adsorption activity of alkane depends on its interaction with the adsorbed surfactant and is proportional to the surface coverage by this surfactant. Also, it is assumed that this increase of the adsorption activity parameter is limited by some maximum value. This model provides a good description of the influence of hexane and dodecane, which results in the decrease of surface tension by 2−5 mN/m at very low surfactant concentrations. The adsorbed amounts of the surfactant and alkane molecules in this low surfactant concentration range have been calculated. The reorientation model of surfactant adsorption predicts a smaller number of alkane molecules per one surfactant molecule than that which follows from the Frumkin model.

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Section: ■ Introductionmentioning

confidence: 99%

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Fainerman¹,

Aksenenko

Makievski³

et al. 2019

Langmuir

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“…Consequently, the adsorption of ILs was facilitated owing to the increase of electrostatic binding sites for IL cations. 138 The adsorption of ILs on the ACs is also found to be highly dependent on the salinity of the solution. Neves et al 133 observed that the addition of Na 2 SO 4 salt in solution could improve the adsorption of ILs onto ACs, particularly for the hydrophilic ILs (e.g., [C 4 mim][Cl] and [C 4 mim][TfO]) that were poorly removed by ACs.…”

Section: Extractionmentioning

confidence: 99%

Recovery and purification of ionic liquids from solutions: a review

et al. 2018

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“…The knowledge presented in these and other textbooks still remains correct and represents the fundamentals of surfactants at interfaces. However, recent papers report on new features of adsorbed surfactant molecules [5][6][7][8][9][10][11] and new experimental methods, such as [12,13] in particular, where studies were performed at water/oil interfaces. As a general fact, it is very clear that the adsorption behavior of surfactants at the surface of an aqueous solution is rather different from that at the interfaces between these solutions and an oil phase.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Effects in Surfactant Adsorption Layers at Water/Alkane Interfaces

Fainerman¹,

Sharipova

Aksenenko

et al. 2019

Colloids and Interfaces

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In the present work, the properties of dodecyl dimethyl phosphine oxide (C 12 DMPO) at the water/decane interface are studied and compared with those obtained earlier at the interface to hexane. To simulate the interfacial behavior, a two-component thermodynamic model is proposed, which combines the equation of state and Frumkin isotherm for decane with the reorientation model involving the intrinsic compressibility for the surfactant. In this approach, the surface activity of decane is governed by its interaction with C 12 DMPO. The theory predicts the influence of decane on the decrease of the surface tension at a very low surfactant concentration for realistic values of the ratio of the adsorbed amounts of decane and surfactant. The surfactant's distribution coefficient between the aqueous and decane phases is determined. Two types of adsorption systems were used: a decane drop immersed into the C 12 DMPO aqueous solution, and a water drop immersed into the C 12 DMPO solution in decane. To determine the distribution coefficient, a method based on the analysis of the transfer of C 12 DMPO between water and decane is also employed.Colloids Interfaces 2019, 3, 67 2 of 11 between the aqueous and oil phase is an additional feature, important for all systems containing non-ionics [14,15].The theoretical description of surfactant adsorption layers at water/oil interfaces started by applying classical models derived for the water/air interface [16]. The lattice theory later derived by Bahramian and Danesh [17] gives a relationship for the interfacial tension but does not specify the contribution of surfactant molecules to the properties of the interfacial layers. In subsequent publications, it was typically stated that the oil molecules can penetrate into the alkyl chain layer of the adsorbed surfactant molecules, leading to stronger adsorption as compared to the water/air surface [18][19][20]. The next step in understanding the special situation at water/oil interfaces was the picture of competitive adsorption of surfactant and oil molecules, as it was discussed in [21], for the homologs of alkyl trimethyl ammonium bromides at different water/alkane interfaces. Such an assumption allowed describing experimental data even better.However, it was experimentally observed that, at very low surfactant concentrations, there is a surface tension decrease of few mN/m, and this effect cannot easily be explained by a competitive surfactant/alkane adsorption alone. In a new theoretical approach by Fainerman et al. [21], it was proposed that there is a cooperative effect governing the formation of the mixed adsorption layer of surfactant and alkane molecule. This cooperativity means that the presence of first-adsorbed surfactant molecules initiates the ordering of alkane molecules at the interface, and this mixed layer provides an attractive environment for surfactants to adsorb and further reduce the interfacial tension.In this paper, we continue the study of dodecyl dimethyl phosphine oxide (C 12 DMPO) adsorption layers, now a...

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Effects of pH and salinity on adsorption of different imidazolium ionic liquids at the interface of oil–water

Cited by 29 publications

References 52 publications

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Recovery and purification of ionic liquids from solutions: a review

Cooperative Effects in Surfactant Adsorption Layers at Water/Alkane Interfaces

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