Introduction

Rouquérol, F.; Rouquérol, J.; Sing, K. S. W.

doi:10.1016/b978-012598920-6/50002-6

Cited by 657 publications

(937 citation statements)

References 40 publications

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“…Indeed, it is common wisdom, in the adsorption community, that the usual bulk phase transitions do not exist anymore in micropores [27], and especially so in zeolites. This view is presumably valid for the adsorption of fluids that have a strong affinity with the adsorbent walls.…”

Section: Thermodynamic Analysis Of the Intrusion Transitionmentioning

confidence: 99%

Thermodynamic study of water confinement in hydrophobic zeolites by Monte Carlo simulations

Fuchs

Cailliez

Boutin

et al. 2009

Molecular Simulation

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International audienceWe report a Grand Canonical Monte Carlo simulation study of water condensation in 4 different hydrophobic, all-silica, zeolites. In all cases, water condensation takes place above the saturation vapour pressure through a first-order like phase transition, with a hysteresis loop. This is at odds with the common belief that conventional phase transitions cannot take place in microporous solids such as zeolites. Forced fluid intrusion experiments, have long been interpreted in terms of irreversibilities. What we show here is that the most important features of this process can be understood in terms of equilibrium thermodynamics considerations. Finally, a strong depletion of confined water is predicted in these nanoporous solids

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Section: Thermodynamic Analysis Of the Intrusion Transitionmentioning

confidence: 99%

Thermodynamic study of water confinement in hydrophobic zeolites by Monte Carlo simulations

Fuchs

Cailliez

Boutin

et al. 2009

Molecular Simulation

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“…Low temperature N 2 adsorption isotherms (not shown here) are of type IV in the IUPAC classification, with a type H3 hysteresis loop typical of aggregates [25]. The total pore volume, micropore volume and surface area are listed in Table 2 The surface chemistry of the CNTs in wet conditions was characterized by the potentiometric titration curves measured in a CO 2 -free 0.01 M NaCl solution ( Figure 1, Table 2).…”

Section: Characterisation Of the Materialsmentioning

confidence: 99%

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Toth

Törőcsik

Tombácz

et al. 2012

Journal of Colloid and Interface Science

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A commercial multiwall carbon nanotube and its carboxylated derivate (CNTC and COOHC, respectively) was used after purification to study the competitive adsorption of phenol (P) and m-chlorophenol (CP) from 0.1 M aqueous NaCl solutions without external pH control. The adsorption takes place practically exclusively on the external surface of the nanotubes. The uptake of P is suppressed in comparison to its single solute behaviour on both nanotubes, independently of the initial pollutant concentration. The uptake of CP however is more sensitive to the concentration and the surface chemistry of the nanotube. The measured coadsorption isotherms were compared to the isotherms calculated from the competitive Langmuir model (CLM). Preferential adsorption of CP was observed in about 95 % of the relative concentration range. The total adsorption may exceed the corresponding single component sorption capacity.

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“…Types II and IV define the adsorption which occurs in the adsorbents with dominant macropores. Types III and V isotherms do not exhibit knee shape behavior on their curves which is an indicative of weak adsorbent-adsorbate interactions [10]. The stepped isotherm, appropriately designated Type VI and relatively rare, is of particular theoretical interest [11].…”

Section: Adsorption Equilibriamentioning

confidence: 99%

Effect of Isotherm Shape on Mass Transfer in an Adsorbent Particle; An Isothermal Adsorption Process

Yildirim¹

2011

TOTPJ

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Abstract:The mass diffusion equation and corresponding initial and boundary conditions were non-dimensionalized for a spherical adsorbent particle in an infinite adsorptive medium to reduce number of independent governing parameters into two as mass transfer Biot number and dimensionless isotherm. The changes in local and average adsorbate concentration throughout the adsorption process were calculated and plotted for different values of mass transfer Biot numbers (ranging from 0.5 to 750) and for five different isotherm shapes. The obtained results indicated that the isotherm shape influences dimensionless period of adsorption, if the external mass transfer resistance is significant in the process. For those cases, the total dimensionless adsorption period for a convex shape isotherm is shorter than a concave one.

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Introduction

Cited by 657 publications

References 40 publications

Thermodynamic study of water confinement in hydrophobic zeolites by Monte Carlo simulations

Thermodynamic study of water confinement in hydrophobic zeolites by Monte Carlo simulations

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Effect of Isotherm Shape on Mass Transfer in an Adsorbent Particle; An Isothermal Adsorption Process

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