Chemistry of carbon surface and mechanism of water molecule adsorption

Vartapetyan, R. Sh.; Волощук, А. М.; Isirikyan, A. A.; Polyakov, N. S.; Tarasevich, Yu. I.

doi:10.1016/0927-7757(95)03180-l

Cited by 22 publications

(14 citation statements)

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“…Studies were performed on a number of solids with hydrophilic (hydromica and mica muscovite, quartz, Li-kaolinite, hematite) and hydrophobic [graphitised thermal carbon black (GTCB), octadecylammonium kaolinite, silica, modified polyethylhydride siloxane, talc) surfaces. GTCB was prepared by the graphitisation of ultradisperse technical carbon at 2800ºC (Vartapetyan et al 1995).…”

Section: Methodsmentioning

confidence: 99%

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Hydrophilicity–Hydrophobicity Characteristics of Solid Surfaces and the State of Water near Surfaces of a Various Nature

Tarasevich

Polyakova

Polyakov

2002

Adsorption Science & Technology

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ABSTRACT:Values for the surface tension, p, of 85 mJ/m 2 and for the contact angle of wetting by water as its saturated vapour, q V , of 75º are proposed as criteria for distinguishing between hydrophilic and hydrophobic solid surfaces. It is shown that the water boundary layers at hydrophilic surfaces are more ordered while those at hydrophobic surfaces are less ordered relative to the situation in the bulk water structure. The localised model can be used to describe the state of motion of water molecules at a hydrophilic surface, while the motion of water molecules near a hydrophobic surface conforms to the non-localised model.

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Section: Methodsmentioning

confidence: 99%

“…GTCB was prepared by the graphitisation of ultradisperse technical carbon at 2800ºC (Vartapetyan et al 1995).…”

Section: Methodsmentioning

confidence: 99%

Hydrophilicity–Hydrophobicity Characteristics of Solid Surfaces and the State of Water near Surfaces of a Various Nature

Tarasevich

Polyakova

Polyakov

2002

Adsorption Science & Technology

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“…There have been many investigations of the isotherms for adsorption of water vapor on activated carbons. − However, investigations of the adsorption kinetics of water vapor on active carbons are limited while the kinetics are of critical importance in assessing the performance of active carbon beds for the adsorption of environmentally unfriendly species. An initial study 9 involved a comparison of adsorption kinetic rates and equilibrium uptakes for water vapor adsorption on a highly microporous coconut-shell-derived carbon in a static water vapor atmosphere at 295 K for a series of pressure increments.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Barriers in the Kinetics of Water Vapor Adsorption/Desorption on Activated Carbons

et al. 1998

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The adsorption of water vapor on a highly microporous coconut-shell-derived carbon and a mesoporous wood-derived carbon was studied. These carbons were chosen as they had markedly different porous structures. The adsorption and desorption characteristics of water vapor on the activated carbons were investigated over the relative pressure range p/p° = 0−0.9 for temperatures in the range 285−313 K in a static water vapor system. The adsorption isotherms were analyzed using the Dubinin−Serpinski equation, and this provided an assessment of the polarity of the carbons. The kinetics of water vapor adsorption and desorption were studied with different amounts of preadsorbed water for set changes in pressure relative to the saturated vapor pressure (p/p°). The adsorption kinetics for each relative pressure step were compared and used to calculate the activation energies for the vapor pressure increments. The kinetic results are discussed in relation to their relative position on the equilibrium isotherm and the adsorption mechanism of water vapor on activated carbons.

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“…Therefore, the experimental work of water adsorption in carbon materials might date back to the early literature to give a complete overview. Nevertheless, simulation studies from the 1980s onwards, have shed much new light on the mechanism of water adsorption on carbons [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Early simulation studies concentrated on the direct interaction between water and a pure graphene surface [23][24][25][26][27], but since graphene is hydrophobic, in the sense that the water-graphene interaction is much weaker than the intermolecular interaction between water molecules, water only adsorbs at pressures greater than the saturation vapor pressure.…”

Section: Introductionmentioning

confidence: 99%