Gas-Chromatographic Studies of the Interaction between Water and Methanol Molecules and the Surface of Carbon Materials

Tarasevich, Yu. I.; Бондаренко, С. В.; Zhukova, A. I.

doi:10.1007/s10450-005-5404-y

Cited by 11 publications

(9 citation statements)

References 9 publications

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“…The fitted results are practically unchanged if n is increased beyond 4, which confirms the results of the quantum-chemical calculation, in correspondence with which the number of molecules in the adsorption center is equal to 4. Treatment of the experimental isotherms obtained in [6] at temperatures of 72, 82, and 93.9°C led to analogous results. It should be noted that fitting with respect to DE 1 , calculated in [4,5], also led to similar results.…”

Section: Fitting Of Data Obtained By the Chromatographic Methods And Rsupporting

confidence: 62%

“…The structural-adsorptive properties of the adsorbent (specific surface by BET 54 m 2 /g, specific volume of mesopores 0.410 cm 3 /g, radius of mesopores 17.5 and 22.5 nm, general specific volume of the pores 0.414 cm 3 /g) were determined by adsorption of nitrogen using an ASAP 2000M apparatus (Micromeritics, USA) at a temperature of 77.2 K on samples previously evacuated at 120°C. The elution peaks were obtained on a Chrom-5 (Czechoslovakia) chromatograph equipped with a 100´0.3 cm steel column filled with a 0.200-0.315 nm fraction of the adsorbent, initially stabilized in a carrier flow at 120°C for 5-6 h. A more detailed description of the experimental results are given elsewhere [6].…”

Section: Methodsmentioning

confidence: 99%

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Complex investigation of cluster adsorbtion of water molecules on hydrophilic centers of graphite and graphitized thermal carbon black

et al. 2007

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A complex theoretical-experimental investigation has been carried out on the interaction of water with hydrophilic centers -phenolic and carboxyl groups -on the surface of graphite and graphitized thermal carbon black in low surface occupation range. It is shown that microclusters, formed by the absorption on such centers, have a cyclic structure of 4-5 molecules similar to those observed in liquid water and on the surface of silver iodide. The formation of such structures is shown to be energetically advantageous. It is shown that the generalized Langmuir equation, derived from molecular-statistical considerations, is considerably better over a wide range of relative pressure for the description of the experimental isotherm for the adsorption of water on graphitized thermal carbon black and allows for a better interpretation of structural and energetic characteristics of adsorbed systems obtained by a complex of methods.Graphite and graphitized thermal carbon black (GTC) are suitable models for the study of the interaction of molecules of water with hydrophilic centers in basically hydrophobic adsorbents. The hydrophilic centers found on the surfaces of these molecules are 3-12 nm [1] apart from one another which is considerably greater than the van der Waals diameter of a water molecule (0.3 nm). This permits the study of the interactions of the water molecules with such hydrophilic centers at low to medium coverage of the surface "in a pure form," without complicated appearance of surface (two-dimensional) association.The study of the adsorption of water on carbon adsorbents is associated with a large number of investigations. A detailed review of this work is given, for example, in [2]. In recent years the study of the interaction of water with the surfaces of carbon surfaces, apart from its theoretical value, has acquired an important practical aspect [3][4][5] in connection with the formation of stable sooty aerosols in the upper levels of the troposphere -products of the incomplete combustion of fuels of internal combustion engines. On interaction with water, sooty aerosols not only form cirrus clouds but also appear as condensation nuclei which affect the formation of cloudiness in the troposphere.Since the surface of soot particles is similar in all properties to GTC, then the study of the interaction of water with graphite and GTC permits, if not regulation, then in ever case to predict the negative effect of the formation of cirrus clouds on the radiation balance of atmosphere and the climate of the planet.In this work we present the results of complex gas chromatographic, molecular-statistical, and quantum-chemical investigations of cluster formation of water molecules on the active centers of graphitized thermal carbon black. 0040-5760/07/4303-0191

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Section: Fitting Of Data Obtained By the Chromatographic Methods And Rsupporting

confidence: 62%

Section: Methodsmentioning

confidence: 99%

Complex investigation of cluster adsorbtion of water molecules on hydrophilic centers of graphite and graphitized thermal carbon black

et al. 2007

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“…The term "highly graphitised" refers to a carbon black which has been heated to a temperature of 2700K or higher under vacuum, or in a reducing environment of pure hydrogen. Three studies of water adsorption on graphitised carbon black were carried out by Kiselev et al [1], Easton and Machin [42] and Tarasevich et al [43]. Amongst these, the one by Kiselev and co-workers is of most interest to us because their isotherms are more extensive and suitable for comparison with simulation results.…”

Section: Resultsmentioning

confidence: 99%

A new molecular model for water adsorption on graphitized carbon black

Nguyen

Nicholson

2014

Carbon

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Adsorption of water on graphitized carbon black at various temperatures has been studied with a new molecular model of graphitized carbon black using Monte Carlo simulation. The model is a collection of graphene layers, modelled by the Steele potential, and a number of phenol groups forming clusters of various sizes which are placed randomly at the graphene edge sites to give an O/C ratio of 0.006. The results are compared with experimental data reported by Kiselev et al. [1] in 1968 for a range of temperatures, and for the first time a reconciliation between the experimental data and simulation has been successfully achieved. The simulation results show that water adsorbs preferentially around the functional groups to form clusters, which then grow and merge at the edges of the graphene layers, rather than adsorbing onto the basal planes of the graphene because the electrostatic interactions (hydrogen bonding) between water molecules are stronger than the basal plane-water dispersion interactions.

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“…The concentration of active centers on the surface of graphite is substantially higher than on the surface of GTB. For example, for thermally expanded graphite with S = 24 m 2 /g the total concentration of carboxylic and phenolic hydroxyl centers (C) amounts to c = 0.25 C/nm 2 , whereas for GTB with S = 54 m 2 /g c = 0.064 C/nm 2 [87]. Quite naturally, the heat of wetting of graphite with water is higher than for GTB.…”

mentioning

confidence: 97%

“…Their amount has been obtained by chemical [85], adsorption [86], and chromatographic [87] methods. The concentration of active centers on the surface of graphite is substantially higher than on the surface of GTB.…”

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confidence: 99%

Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

Tarasevich

2008

Theor Exp Chem

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Papers on the energetics of the interaction of various substances with the surface of hydrophilic and hydrophobic sorbents using the data from heats of wetting are reviewed. The thermodynamics of wetting is examined, and the important role of the heats of wetting for the production of quantitative data on the surface energy of solids is demonstrated. The uniqueness of the information on the physicochemical characteristics of the sorbents and catalysts obtained from the immersion wetting isotherms is emphasized, and up-to-date information on the extent, structure, and characteristics of the boundary layers of water is analyzed. It is shown that the calorimetric data serve as an experimental base for obtaining data on the structural ordering-disordering of the boundary layers of water.

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Gas-Chromatographic Studies of the Interaction between Water and Methanol Molecules and the Surface of Carbon Materials

Cited by 11 publications

References 9 publications

Complex investigation of cluster adsorbtion of water molecules on hydrophilic centers of graphite and graphitized thermal carbon black

Complex investigation of cluster adsorbtion of water molecules on hydrophilic centers of graphite and graphitized thermal carbon black

A new molecular model for water adsorption on graphitized carbon black

Energetics of the interaction of water and other liquids with the surface of hydrophilic and hydrophobic sorbents according to data on the heats of wetting

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