Intraparticle Mass Transport Mechanism in Activated Carbon Adsorption of Phenols

Furuya, Eiji; Chang, H. T.; Miura, Yusho; Yokomura, H.; Tajima, Syougo; Yamashita, Seiichi; Noll, Kenneth E.

doi:10.1061/(asce)0733-9372(1996)122:10(909)

Cited by 23 publications

(20 citation statements)

References 14 publications

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“…Since the first one is independent of concentration (i.e., only depends on the microstructure and the molecular diffusivity), the dependency of the effective diffusivity shown in Figure 5 is due to the surface contribution. This idea is in agreement with previous behavior found elsewhere (Furuya et al, 1996;Ocampo-Pérez et al, 2010), as will be discussed later.…”

Section: Resultssupporting

confidence: 93%

“…Surface diffusion refers to the movement of the adsorbate through the solid surface and is also influenced by the distribution of phases; the main driving force is the surface concentration gradient. It has been found that surface diffusion depends on the surface concentration and the sorptive affinity between the molecules of adsorbate and adsorbent (Suzuki and Fujii, 1982;Furuya et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Effective transport properties for the pyridine-granular activated carbon adsorption system

Baz-Rodríguez

Ocampo-Pérez

Ruelas-Leyva

et al. 2012

Braz. J. Chem. Eng.

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-In this work, the kinetics of pyridine adsorption onto granular activated carbon was studied from the point of view of an up-scaling process by using the method of volume averaging. The pore and surface effective diffusivities were estimated by supposing simple microscale geometries (ordered media of cylinders and spheres) and those of images processed from SEM (Scanning Electron Microscopy) micrographs. In addition, as a rough estimate, the point surface diffusivity is reported. The results revealed that the up-scaled diffusional model satisfactorily interpreted the concentration decay curves and the effective diffusivity was found to be an increasing function of the concentration, mainly due to the contribution of surface diffusion. In general, the diffusivity coefficients involved in the adsorption system are related through the expression molecular diffusivity = 22 × point surface diffusivity = 5/2 × pore effective diffusivity = 1/12 × surface effective diffusivity.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effective transport properties for the pyridine-granular activated carbon adsorption system

Baz-Rodríguez

Ocampo-Pérez

Ruelas-Leyva

et al. 2012

Braz. J. Chem. Eng.

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“…The mass flux is then related to the difference between the equilibrium surface concentration and the average adsorbed phase concentration. Although the global mass transfer coefficient is often considered as an adjustable parameter, as for the ACF here, some authors attempted to correlate its value with pore and surface diffusion coefficients for a granular adsorbent (Furuya et al 1996). The pore diffusion coefficient is itself influenced by the pore size distribution.…”

Section: Theoretical Approachmentioning

confidence: 99%

Modeling breakthrough curves of volatile organic compounds on activated carbon fibers

et al. 2010

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Granular activated carbon (GAC) and more recently activated carbon fibers (ACF) are used for the treatment of volatile organic compounds (VOC) in industrial processes. The purpose of this study was to investigate the adsorption kinetics of ACF to eliminate VOC from polluted air. This approach is carried out by modeling experimental breakthrough curves with two kinds of models: an equilibrium model and a mass transfer model based on a linear driving force (LDF) in conjunction with the Langmuir equilibrium model. The results show the influence of the intraparticle diffusion on the adsorption kinetics of ACF, in spite of their small fiber diameter. Moreover, external diffusion kinetics is fast because of the influence of the large external surface area of ACF on the VOC mass transfer. Abbreviations a External surface area of adsorbent particles per unit adsorbent volume, m 2 /m 3 C i Bulk-fluid phase concentration of component i, kg/m 3 C is Fluid phase concentration of component i on the surface of particles, kg/m 3 C in Inlet bulk-fluid phase concentration of component i, kg/m 3 C i Average concentration of component i in the fluid phase inside the particle, kg/m 3 D e Effective intraparticular diffusion coefficient, m 2 /s D K Knudsen diffusion, m 2 /s D m Molecular diffusivity of the component i in the carrier, m 2 /s D z Axial dispersion coefficient, m 2 /s d f Fiber diameter, m K Langmuir isotherm parameter, m 3 /kg k f External diffusion coefficient, m/s k p Intraparticular diffusion parameter, 1/s L Column length, m Pe Peclet number q i Average solid phase concentration of component i (amount adsorbed), kg/kg q im Langmuir isotherm parameter, kg/kg q is Concentration of component i on the surface of the particle, kg/kg r f Fiber radius, m T Temperature, K t Dimensional time u Interstitial velocity of fluid, m/s Y Dimensionless axial coordinate z Axial coordinate, m ε Bed void volume fraction ε p Particle porosity ρ p Density of the adsorbent, kg/m 3 148 Adsorption (2010) 16: 147-153

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“…On the other hand, surface diffusion occurs along the pore surface of the adsorbent after initial adsorption has taken place. The driving force for the surface diffusion is the difference in the amount adsorbed on the pore surface [7]. In the case of the adsorption by granular activated carbon, the surface diffusion is dominant [8].…”

Section: Introductionmentioning

confidence: 99%

“…This problem could be minimized when the intraparticle diffusivity is estimated from the shallow bed technique or differential reactor methods [21]. For example, the shallow bed technique has the advantage of reducing diffusion resistance at fluid-to-solid film (liquid film resistance) at very high fluid flow rate [7,22,23]. Hence, the intraparticle diffusivity can be experimentally determined when liquid film resistance surrounding the adsorbent particle is negligible.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of intraparticle diffusivity and liquid film mass transfer coefficient from a single-component adsorption uptake curve

Sonetaka

Fan

Kobayashi

et al. 2009

Journal of Hazardous Materials

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Intraparticle Mass Transport Mechanism in Activated Carbon Adsorption of Phenols

Cited by 23 publications

References 14 publications

Effective transport properties for the pyridine-granular activated carbon adsorption system

Effective transport properties for the pyridine-granular activated carbon adsorption system

Modeling breakthrough curves of volatile organic compounds on activated carbon fibers

Simultaneous determination of intraparticle diffusivity and liquid film mass transfer coefficient from a single-component adsorption uptake curve

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