Critical review in adsorption kinetic models

Qiu, Hui; Lv, Lu; Pan, Bingcai; Zhang, Qing-jian; Zhang, Weiming; Zhang, Quanxing

doi:10.1631/jzus.a0820524

Cited by 1,434 publications

(777 citation statements)

References 45 publications

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“…Currently, the literature provides a wide number of kinetic models [22,23] which can generally be classified as adsorption reaction models and adsorption diffusion models. Because of the complexity involved in the prediction of kinetic parameters, a typical approach consists in fitting experimental data to a series of established models, and selecting the one that provides the best fit.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

176

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Most practical applications of solids in industry involve porous materials and adsorption processes. A correct assessment of the equilibrium and kinetics of adsorption is extremely important for the design and operation of adsorption based processes. In our previous studies we focused on the evaluation of the equilibrium of CO 2 /CH 4 adsorption on cherry stone-based carbons. In the present paper the kinetics of adsorption of CO 2 on two cherry stone-based activated carbons (CS-H 2 O and CS-CO 2 ), previously prepared in our laboratory, has been evaluated by means of transient breakthrough experiments at different CO 2 /CH 4 feed concentrations, at atmospheric pressure and 30 ˚C. A commercial activated carbon, Calgon BPL, has also been evaluated for reference purposes. Three models have been applied to estimate the rate parameters during the adsorption of CO 2 on these carbons, pseudo-first, pseudo-second and Avrami´s fractional order kinetic models. Avrami´s model accurately predicted the dynamic CO 2 adsorption performance of the carbons for the different feed gas compositions. To further investigate the mechanism of CO 2 adsorption on CS-H 2 O, CS-CO 2 and Calgon BPL, intra-particle diffusion and Boyd´s film-diffusion models were also evaluated. It was established that mass transfer during the adsorption of CO 2 from CO 2 /CH 4 is a diffusion-based process and that the main diffusion mechanisms involved 2 are intra-particle and film diffusion. At the initial stages of adsorption, film diffusion resistance governed the adsorption rate, whereas intra-particle diffusion resistance was the predominant factor in the following stages of adsorption.

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Section: Introductionmentioning

confidence: 99%

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

176

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“…These models are mainly three parametric equations. These new models are expected to describe the performance of a given biosorbent more accurately and to help gain insight in biosorption mechanism [21].…”

Section: Adsorption Kinetic Modelingmentioning

confidence: 99%

Biosorptive Performance of Bacillus arsenicus MTCC 4380 Biofilm Supported on Sawdust/MnFe2O4 Composite for the Removal of As(III) and As(V)

Podder

Majumder

2016

Water Conserv Sci Eng

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One of the main environmental concerns of today is the occurrence of arsenic in wastewater. Targeting a solution for this problem, several efforts have been made towards research and application of cost-effective and effortlessly adaptable processes. The ability of a biofilm of Bacillus arsenicus MTCC 4380 supported on sawdust/MnFe 2 O 4 composite to biosorb/ bioaccumulate As(III) and As(V) was investigated in batch experiments. Optimum biosorption/bioaccumulation conditions were determined as a function of contact time and temperature. The equilibrium was achieved after about 220 min at 30°C temperature. Nonlinear regression analysis was done to determine the best-fit kinetic model based on three correlation coefficients and three error functions and also to predict the parameters involved in kinetic models. The results showed that both Brouers-Weron-Sotolongo and Avrami models for both As(III) and As(V) were capable of providing realistic explanation of biosorption/bioaccumulation kinetic. Applicability of mechanistic models showed that the rate controlling step in the biosorption/bioaccumulation of both As(III) and As(V) was film diffusion rather than intraparticle diffusion. The estimated thermodynamic parameters ΔG 0 , ΔH 0 , and ΔS 0 revealed that biosorption/bioaccumulation of both As(III) and As(V) was feasible, spontaneous, and exothermic under examined conditions. The activation energy (E a ) estimated from Arrhenius equation specified the nature of biosorption/bioaccumulation being ion exchange type. The effect of co-existing ions such as Cu 2+ , Zn 2+ , Bi 3+ , Cd 2+ , Fe 3+ , Pb 2+ , Co 2+ , Ni 2+ , Cr 6+ , and SO 4 2− at different concentrations was inspected.

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“…Generally, kinetic analysis unveil the solute uptake rate, which explain the residence time required for completion of adsorption reaction. In other words, adsorption kinetics is critical in the determination of the performance of fixed-bed in any flow-through or column systems [27].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Mx+ Salts of Fatty Acids Adsorption onto Metallic Ores

Udoji¹,

Etim²

2015

IJESD

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Abstract-Iron ore as possible adsorbent for metallic salts of fatty acid (M x+ -SFA) oils was investigated. Experimental constants from several kinetic models were used to interpret M x+ -SFA uptake. Mode of diffusion was also studied. Applicability tests for adopted models favors the Pseudo second order kinetics which presented high R 2 values > of 0.9; high precision or least qcal/qexp values of ratio within 1.0 for the K + -SFA, Ca 2+ -SFA and Al 3+ -SFA sorption. The Pseudo second order equation also gave least values for the three error functions viz: 9.6×10 -4 to 5.4×10 -3 , 3.1×10 -2 to 7.4×10 -2 and 4.6×10 -3 to 2.5 ×10 -3 for EABS, SSE and X 2 respectively. Multiple linearity presented by intra-particle diffusion plots is of three distinct stages of linear initial, linear intermediate and linear last portions. These stages are coupled with the nonpassage of lines through the origin being an indication that other diffusion models such as mass transfer or film diffusion exists and that the intra-particle diffusion is not the only rate factor controlling M x+ -SFA sorption.

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Critical review in adsorption kinetic models

Cited by 1,434 publications

References 45 publications

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Biosorptive Performance of Bacillus arsenicus MTCC 4380 Biofilm Supported on Sawdust/MnFe2O4 Composite for the Removal of As(III) and As(V)

Dynamics of Mx+ Salts of Fatty Acids Adsorption onto Metallic Ores

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