Adsorption comparison at the α-alumina/water interface: 3,4-Dihydroxybenzoic acid vs. catechol

Borah, Jayanta M.; Sarma, Jyotirmoy; Mahiuddin, Sekh

doi:10.1016/j.colsurfa.2011.07.024

Cited by 74 publications

(44 citation statements)

References 35 publications

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“…The above results indicated that neither the Pseudo-first nor Pseudo-second order model was suitable for modeling the adsorption kinetics of GMCM-41-TEPA50%. The Pseudo-first order model accurately represented the reversible adsorption between the gas and solid surface as an equilibrium was established, while the Pseudo-second order model was based on the assumption that chemisorption was the rate-controlling step [44][45][46]. The experimental data did not fit well with either models, which indicated that CO 2 adsorption over GMCM-41-TEPA50% is neither simple physisorption nor simple chemisorption.…”

Section: Adsorption Kineticsmentioning

confidence: 93%

Tetraethylenepentamine-modified MCM-41/silica gel with hierarchical mesoporous structure for CO2 capture

Wang

Guo

Kong

2015

Chemical Engineering Journal

107

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Section: Adsorption Kineticsmentioning

confidence: 93%

Tetraethylenepentamine-modified MCM-41/silica gel with hierarchical mesoporous structure for CO2 capture

Wang

Guo

Kong

2015

Chemical Engineering Journal

107

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“…The pseudo-second-order model assumes that the interaction between adsorbent and adsorbate is caused by the strong binding of gas molecules to the surface of the adsorbent and has been found suitable for predicting CO 2 sorption behavior based on chemical interactions [36]. This model is also useful for describing solids diffusion rate controlled processes that cannot be properly described by the pseudo-first order model.…”

Section: Pseudo-second Order Modelmentioning

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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“…Indeed, they were evidenced in several humus of soils and in fruit peels [14][15][16][17][18][19][20] and these three acids differ only by adding an OH group on the aromatic ring. Adsorption of organic acids onto oxides is maximum for pH values around the pK a of acids [10,[21][22][23][24] and depends on several parameters such as pH, ionic strength, and number and position of ionizable polar functional groups [21,[24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%