Correlation between two- and three-dimensional condensations in cylindrical mesopores of active carbons

Dobruskin, Vladimir Kh.

doi:10.1016/s0008-6223(00)00172-x

Cited by 13 publications

(21 citation statements)

References 17 publications

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“…A look at Fig. 5 illustrates that the adsorption volume capacity (Q v ) increased with increasing combined micropore and mesopore volume of adsorbents [25,26]. Similar results were obtained by Kleineidam [27] and Choma [28] for nonpolar organic substance adsorption on active carbon from aqueous solution.…”

Section: Sorption Isotherm Parameterssupporting

confidence: 80%

Application of the Polanyi potential theory to phthalates adsorption from aqueous solution with hyper-cross-linked polymer resins

Zhang

Pan

et al. 2008

Journal of Colloid and Interface Science

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Section: Sorption Isotherm Parameterssupporting

confidence: 80%

Application of the Polanyi potential theory to phthalates adsorption from aqueous solution with hyper-cross-linked polymer resins

Zhang

Pan

et al. 2008

Journal of Colloid and Interface Science

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“…Apart from a sphere, we intend to discuss two examples of interactions between a molecule and a cylinder. This problem has been examined in our earlier publication …”

Section: Comparison With Experimentsmentioning

confidence: 98%

“…Concept of Autoadsorption. Equation 11 is the generalization of the condensation equation − suggested for calculating monolayer adsorption by means of comparison of adsorption on nanoparticles or in porous media with the adsorption properties of the reference nonporous body: where p and p ref are the equilibrium pressures of adsorbate on surfaces of the body of interest and the reference body at a given amount adsorbed, a , and Δε* is the difference of the potential energies of adsorption on the surfaces in the Henry limit.…”

Section: General Thermodynamic Approachmentioning

confidence: 99%

Correlation between Saturation Pressures and Dimensions of Nanoparticles. Are the Fundamental Equations Really Fair?

Dobruskin¹

2003

Langmuir

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The relationships between the geometric form and saturation pressure are derived on the basis of thermodynamics and molecular models. A comparison of the relationships with the classical Laplace and Kelvin equations shows that there is a profound conceptual diversity between approaches: the classical equations contain the surface tension, γ, as a parameter, whereas developed equations include the difference of the potential energies of a nanoparticle and a semi-infinite planar body with respect to the gas phase, which is equal to the difference of energies of autoadsorption on surfaces of bodies. The latter circumstance affords ground for calculating the change of interest proceeding from well-developed methods of adsorption theory. Molecular models are discussed for simple spherical bodies and applied to the processes of nucleation and growth of drops. In the cases of (i) water and mercury drops or capillaries with diameters of ≈1 µm and (ii) cyclohexane meniscuses on mica cylinders, the classical and new relations predict close results, which are in agreement with experiments; nevertheless, for organic substances, especially at elevated temperatures, noticeable deviations must be expected. The divergence of the approaches makes its appearance in the case of condensation in narrow capillaries with radii ≈1-10 nm when the new equation provides a correct description of experimental facts whereas the Kelvin model predicts unrealistic effects. Considering the growth of surface areas due to the extension or adsorption shows that γ does not take into account all changes associated with alterations of surface areas, and it is this fact that underlies the probable defect in the classical equations.

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“…The origin of adsorption hysteresis has been the subject of discussion ever since the existence of the phenomenon was fi rst recognized. 9 The views on hysteresis are much infl uenced by the ink-bottle model [10][11][12] (pores with narrow necks and wide bodies) in which the effect of narrow constrictions on the ease of meniscus formation is consid- …”

Section: Pore Structurementioning

confidence: 99%

Production and characterization of KOH-activated carbon derived from polychlorinated biphenyl residue generated by the sodium dispersion process

Huang

Kobayashi

Sakata

et al. 2007

J Mater Cycles Waste Manag

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Polychlorinated biphenyl (PCB) residues from the sodium dispersion (SD) process were employed as the raw materials for the production of activated carbon using KOH activation. The pore properties, such as the specifi c surface area and pore size distribution, were characterized using the Barrett-Joyner-Halenda method and the Horvath-Kawazoe method based on the N 2 adsorption isotherm at 77 K. The activated carbon produced showed similar adsorption capacities and specifi c surface areas to the commercially available product. The effects of the activation conditions on the porosity of the activated carbon produced were studied. The most signifi cant factor affecting the specifi c surface proved to be the activation temperature. The activated carbon produced from PCB residues from the high-temperature (423-443 K) SD process had a binary pore size distribution well developed in the 4 nm region and in the micropore region. The pore structure of the carbon produced from PCB residues from the low-temperature (333-393 K) SD process had a wide range of micropores and mesopores.

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Correlation between two- and three-dimensional condensations in cylindrical mesopores of active carbons

Cited by 13 publications

References 17 publications

Application of the Polanyi potential theory to phthalates adsorption from aqueous solution with hyper-cross-linked polymer resins

Application of the Polanyi potential theory to phthalates adsorption from aqueous solution with hyper-cross-linked polymer resins

Correlation between Saturation Pressures and Dimensions of Nanoparticles. Are the Fundamental Equations Really Fair?

Production and characterization of KOH-activated carbon derived from polychlorinated biphenyl residue generated by the sodium dispersion process

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