On the isosteric heat of adsorption of non-polar and polar fluids on highly graphitized carbon black

Horikawa, Toshihide; Zeng, Yonghong; Do, D.D.; Sotowa, Ken‐Ichiro; Alcántara-Ávila, J. Rafael

doi:10.1016/j.jcis.2014.10.024

Cited by 75 publications

(51 citation statements)

References 29 publications

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“…To understand the origin of the broad hysteresis loop, we need to describe the mechanism of water adsorption in Carbopack F: at very low loadings, water molecules adsorb around the functional groups at the edges of the graphene layers because of the strong electrostatic interactions compared to the intermolecular interactions and the interactions between water and the graphene layer. As the loading is increased water clusters are formed around the functional groups and grow in size because of the greater electrostatic interaction between water molecules than the dispersive water-graphene interaction [17]. This mechanism of adsorption was taken into account in the recent theories for water adsorption in porous carbon [12,18], and is also justified with molecular dynamics [19] and Monte Carlo simulations [20].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 98%

“…Not only hysteresis of water adsorption is observed in porous carbons, but it also occurs with non-porous carbon, even with graphitized thermal carbon blacks (GTCB) [16]. We have reported water adsorption on Carbopack F (a highly GTCB) [16,17] that the uptake is very small (almost insignificant) for pressures up to a relative pressure, P/P 0 , of 0.9, at which the uptake begins to increase steeply.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Horikawa

Muguruma

et al. 2015

Carbon

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Adsorption isotherms of water on porous carbons generally show large hysteresis loops whose origin is believed to be different from simple gases adsorption in mesoporous solids. In this paper, we discussed in details the behavior of water adsorption isotherms and their descending scanning curves for two carbons of different topologies, a highly graphitized thermal carbon black, Carbopack F, and a highly ordered mesoporous carbon, Hex. For both solids, very large hysteresis loops are observed, but their behaviors are different. For Carbopack F, the loop extends over a very wide range of pressure and the loop is larger when the descending is started from a higher loading; while for Hex, the hysteresis loop shows distinct steps, the number of which depends on the loading where the descending starts. By carefully analyzing the scanning curves from different loadings, we established the mechanism of water adsorption in Hex as a sequence of three steps: (1) water molecules adsorb on functional groups located at the junctions between adjacent basal planes of graphene layers, (2) growth of water clusters around the functional groups, and (3) bridging of adjacent clusters to form larger clusters, followed by a complete filling of mesopores.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 98%

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Horikawa

Muguruma

et al. 2015

Carbon

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“…This consists of polyhedral micro-particles with homogeneous graphene layers on the faces of the polyhedra. The BET surface area is 4.9 m 2 /g and there are no detectable micropores or mesopores [14][15][16].…”

Section: Methodsmentioning

confidence: 99%

On the resolution of constant isosteric heat of propylene adsorption on graphite in the sub-monolayer coverage region

Prasetyo

Razak

Duong

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Highlights Resolution of isosteric heat versus loading for propylene adsorption on graphite  Importance of the solid-fluid (SF) interaction with orientation of propylene  Extensive simulation study of propylene adsorption with various potential models  The dominance of adsorbate interactions over the SF interactions AbstractAn early experimental study by Bezus, Dreving and Kiselev [1] on the adsorption of propylene on Spheron-6 carbon black (graphitized at ~3000C) reported a plot of constant isosteric heat versus loading in the sub-monolayer region. This contrasts with their report of a linear increase in isosteric heat for propane, a similar molecule to propylene. In this paper, we report extensive Grand Canonical Monte Carlo (GCMC) simulations and a high-resolution experimental study of propylene adsorption on Carbopack F, a highly graphitized thermal carbon black, over the same temperature range studied by Bezus et al. From this combined simulation and experimental study we conclude that propylene also shows a linear increase in the isosteric heat versus loading in the sub-monolayer region, indicating that the linear increase in the fluid-fluid interaction in this region more than compensates for the decrease in the solid-fluid interaction that results from the change in orientation of the adsorbate molecules. Our study contradicts the propylene results of Bezus et al., and careful

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“…Its TEM image of Carbopack F was reported in Nguyen et al (2013) and Horikawa et al (2015), and it shows the multi-facets of the basal plane composed of graphene layers. Similar image was also reported for P-33 (Graham and Kay, 1961), which was known as the most homogeneous graphitized carbon black, for comparison.…”

Section: Methodsmentioning

confidence: 99%

The interplay between molecular layering and clustering in adsorption of gases on graphitized thermal carbon black – Spill-over phenomenon and the important role of strong sites

Tan

Zeng

et al. 2015

Journal of Colloid and Interface Science

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We analyse in detail our experimental data, our simulation results and data from the literature, for the adsorption of argon, nitrogen, carbon dioxide, methanol, ammonia and water on graphitized carbon black (GTCB), and show that there are two mechanisms of adsorption at play, and that their interplay governs how different gases adsorb on the surface by either: (1) molecular layering on the basal plane or (2) clustering around very strong sites on the adsorbate whose affinity is much greater than that of the basal plane or the functional groups. Depending on the concentration of the very strong sites or the functional groups, the temperature and the relative strength of the three interactions, (a) fluid-strong sites (fine crevices and functional group) (F-SS), (b) fluid-basal plane (FB) and (c) fluid-fluid (FF), the uptake of adsorbate tends to be dominated by one mechanism. However, there are conditions (temperature and adsorbate) where two mechanisms can both govern the uptake. For simple gases, like argon, nitrogen and carbon dioxide, adsorption proceeds by molecular layering on the basal plane of graphene, but for water which represents an extreme case of a polar molecule, clustering around the strong sites or the functional groups at the edges of the graphene layers is the major mechanism of adsorption and there is little or no adsorption on the basal planes because the F-SS and FF interactions are far stronger than the FB interaction. For adsorptives with lower polarity, exemplified by methanol or ammonia, the adsorption mechanism switches from clustering to layering in the order: ammonia, methanol; and we suggest that the bridging between these two mechanisms is a molecular spill-over phenomenon, which has not been previously proposed in the literature in the context of physical adsorption.

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On the isosteric heat of adsorption of non-polar and polar fluids on highly graphitized carbon black

Cited by 75 publications

References 29 publications

Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

On the resolution of constant isosteric heat of propylene adsorption on graphite in the sub-monolayer coverage region

The interplay between molecular layering and clustering in adsorption of gases on graphitized thermal carbon black – Spill-over phenomenon and the important role of strong sites

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