A study of the adsorption of stearic acid onto ferric oxide

Husbands, D.I.; Tallis, W.; Waldsax, John C. R.; Woodings, Calvin; Jaycock, Michael J.

doi:10.1016/0032-5910(71)80067-0

Cited by 11 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, few publications are devoted to the study of fatty acid adsorption on the surface of ferroparticles [1][2][3][4]. At the same time, there are many published works dealing with the study of the mechanism of adsorption of various substances from solutions on the surface of metals and their oxides (e.g., see [5][6][7]). A much attention is paid to the role of water molecules preliminarily adsorbed on a solid surface in adsorption processes [6][7][8][9], the role of solvents in these processes [10], etc.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 1. Isotherms of adsorption of oleic, linoleic, and linolenic acid from carbon tetrachloride and hexane

et al. 2004

View full text Add to dashboard Cite

Isotherms of adsorption of oleic, linoleic, and linolenic acids on magnetite from solutions in carbon tetrachloride and hexane are measured. When CCl 4 is used as a solvent, the adsorption values increase in the following order: oleic, linoleic, and linolenic acid. In the case of hexane, the order is opposite. Adsorption isotherms of the fatty acids on aggregated magnetite are described in terms of the theory of volume filling of micropores. It is disclosed that, in the case of CCl 4 , the limiting adsorption values and characteristic energies of the process increase in a series: oleic, linoleic, and linolenic acid, but in the case of hexane, they decrease in the same sequence. Upon the adsorption of fatty acids from solutions in CCl 4 and hexane on finely dispersed magnetite, molecules of the acids and solvents compete for the active sites on the adsorbent surface. The number of double bonds in the molecules of unsaturated fatty acids and the desolvation of both the adsorbent surface and adsorbate molecules substantially affect the adsorption of these acids. The effect of the solvents is most pronounced for the adsorption of oleic acid, decreasing with a rise in the number of double bonds in a fatty acid molecule.

show abstract

Section: Introductionmentioning

confidence: 99%

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 1. Isotherms of adsorption of oleic, linoleic, and linolenic acid from carbon tetrachloride and hexane

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The solids concentration of 20 g/L was selected to provide enough surface area for the stearate molecules at the stearate concentrations used so that the λ values would cover a range between about 0.1 and 2. Stearic acid was reported to have a parking area between 0.2 [34,[43][44][45] and 0.7 nm 2 [46][47][48][49] depending on the orientation of the molecule on the surface. A more recent work reported a parking area of 0.47 nm 2 [36] where the stearate molecule was proposed to adsorb binuclearly onto two aluminum atoms through the carboxylate group.…”

Section: Methodsmentioning

confidence: 99%

“…The model was tested with the sodium stearate/water/α-alumina system for the specific reasons that (i) α-alumina provides essentially a nonporous, homogeneous surface; (ii) the stearate molecules produce multilayers on α-alumina [33][34][35][36]; (iii) adsorption takes place through both chemisorption (the carboxylate-surface hydroxyl bonds) [36][37][38] and physisorption (the stearate-stearate hydrocarbon chain bonds) [35,36,38,[40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Polat

2006

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

A phenomenological multilayer adsorption model for a well-dispersed, homogeneous, nonporous adsorbent and a molecular adsorbate is presented. The model provides explicit kinetic expressions associating the adsorbed amounts to the fraction of the surface occupied and reduces to the first-and second-order adsorption models for special cases. Parameters of the model are a pair of true rate constants related to the adsorbateadsorbent and adsorbate-surface adsorbate affinities. A general graphical procedure and analytical equations for special cases are provided to estimate the rate constants from kinetic adsorption data. Data from the adsorption of sodium stearate onto α-alumina from water were used to test the model. The predicted values of the rate constants suggested that the stearate was distributed homogeneously on the alumina surface and essentially adsorbed as a monolayer before starting to form the second layer.

show abstract

“…A great many papers have been devoted to prob lems of the adsorption of surfactants (SFA) from solu tions onto solid surfaces [1][2][3][4][5][6]. However, aspects of the mechanism of SFA adsorption and the structure of adsorption layers on solids surface are still subject to debate.…”

Section: Introductionmentioning

confidence: 99%

State of adsorption layers of fatty acids on the surfaces of iron, manganese, and copper ferrites

Balmasova

Ramazanova

Korolev

2012

Russ. J. Phys. Chem.

View full text Add to dashboard Cite

States of adsorbed substances in surface layers arising during the adsorption of oleic, linoleic, and linolenic acids from carbon tetrachloride, heptane, and cyclohexane solutions on the surfaces of iron, man ganese, and copper ferrites, are investigated. Adsorption isotherms and two dimensional state diagrams of surface layers of iron, manganese, and copper ferrites are obtained experimentally. It is shown that the adsorption of fatty acids from solutions in organic solvents proceeds via filling the volume of the ferrites' porous space with adsorption solutions, while the state of ferrite surface layers changes due to the structural rearrangement of adsorption solutions upon an increase in solute concentration.

show abstract

A study of the adsorption of stearic acid onto ferric oxide

Cited by 11 publications

References 28 publications

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 1. Isotherms of adsorption of oleic, linoleic, and linolenic acid from carbon tetrachloride and hexane

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 1. Isotherms of adsorption of oleic, linoleic, and linolenic acid from carbon tetrachloride and hexane

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

State of adsorption layers of fatty acids on the surfaces of iron, manganese, and copper ferrites

Contact Info

Product

Resources

About