Application of Dubinin—Radushkevich—type equation for describing bisolute adsorption from dilute aqueous solutions on activated carbon

Jaroniec, Mietek; Deryło, A.

doi:10.1016/0021-9797(81)90274-5

Cited by 39 publications

(11 citation statements)

References 11 publications

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“…Figure 9 d shows the Dubinin–Radushkevich (DR) isotherm, which predicts dilute liquid adsorption behaviour [ 69 ]. This isotherm was subsequently generalised to the Dubinin–Astokov (DA) isotherm ( Figure 9 e), which accounts for non-ideal adsorption behaviour [ 70 ].…”

Section: Resultsmentioning

confidence: 99%

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Muedi

Masindi

Maree³

et al. 2022

Nanomaterials

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This study presents the first known exploration of Congo red dye (CR) adsorption by a polycationic Fe/Al Di-metal nanostructured composite (PDFe/Al) synthesised using Fe(III) and Al(III) recovered from authentic acid mine drainage (AMD). The PDFe/Al successfully removed CR from the aqueous solution. The mineralogical, microstructural, and chemical properties of the synthesised PDFe/Al adsorbent (before and after adsorption) were studied using state-of-the-art analytical instruments. The optimum conditions were observed to be 100 mg·L−1 CR, 1 g of the PDFe/Al in 500 mL adsorbate solution, 20 min of shaking, pH = 3–8, and a temperature of 35 °C. At optimised conditions, the PDFe/Al showed ≥99% removal efficacy for CR dye and an exceptionally high Langmuir adsorption capacity of 411 mg·g−1. Furthermore, a diffusion-limited adsorption mechanism was observed, with two distinct surfaces involved in the adsorption of CR from an aqueous solution. It was determined that the adsorption of CR induced internal strain and deformation within the matrices and interlayers of the PDFe/Al which resulted in a marked increase in the adsorbent pore surface area and pore volume. The remarkably high adsorption capacity could be attributed to the high surface area. A regeneration study showed that the adsorbent could be reused more than four times for the adsorption of CR. The findings from this study demonstrated the feasibility of recovering valuable minerals from toxic and hazardous AMD and demonstrated their potential for the treatment of industrial wastewaters.

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Section: Resultsmentioning

confidence: 99%

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Muedi

Masindi

Maree³

et al. 2022

Nanomaterials

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“…In order to study the isotherm of CO 2 adsorption process with carbazole‐based HCP, q e (equilibrium adsorption capacity) and P e (equilibrium pressure) data were fitted on different isotherm models. Five normal adsorption models including, Langmuir, Freundlich, Dubinin Radushkevich, Temkin, and Hill, 49,52‐54 are considered for the feasibility of sorbate‐sorbent interaction. In the Langmuir model, the amount of adsorption is proportional to the fraction of the adsorbent surface that is open, while desorption is proportional to the fraction of the adsorbent surface that is covered.…”

Section: Resultsmentioning

confidence: 99%

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO₂ capture

Penchah

Najafi

Ghaemi

et al. 2021

Env Prog and Sustain Energy

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In this study, a hypercrosslinked polymer (HCP) adsorbent based on Friedel-Crafts reaction and carbazole as a monomer was synthesized and used for CO 2 capture. The HCP adsorbent is characterized by Fourier transform infrared spectroscopy, Brunauer, Emmett and Teller analysis, and energy dispersive spectroscopy. The effects of crosslinker to carbazole ratio, synthesis time and catalyst type, and their interactions were evaluated by response surface methodology using central composite design. The result showed that the optimum adsorption capacity (191.2 mg/g) was obtained at a crosslinker to carbazole ratio of 2.7, synthesis time of 11.2 h, and FeCl 3 as catalyst of the reaction. The experimental adsorption data fitted by adsorption isotherm and kinetic models in the optimized parameter values and correlation coefficient (R 2 ) were considered to select the best model. The results showed that Hill isotherm and Elovich kinetic models have higher R 2 values than other models. Finally, the feasibility of the adsorption process was determined by thermodynamic modeling and enthalpy, entropy, and Gibbs free energy differences of adsorption at 298.15 K and 5 bar were calculated −15.035 kJ/mol, −0.025 kJ/mol.K and −7.822 kJ/mol, respectively.

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“…The DR equation is a good mathematical description of both vapor adsorption and adsorption in dilute liquid/solid systems (Jaroniec and Derylo 1981).…”

Section: Background and Theorymentioning

confidence: 99%

Surface Heterogeneity of Trimethylphenylammonium-Smectite as Revealed by Adsorption of Aromatic Hydrocarbons from Water

Sheng

Boyd

1997

Clays and clay miner.

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Abstract--Adsorption studies of aromatic hydrocarbons of various molecular sizes on organo-clays in aqueous solution were carried out for characterizing the surface heterogeneity of organo-clays. Benzene, toluene, pxylene, ethylbenzene and n-propylbenzene adsorption by a smectite with 5 different exchange degrees of trimethylphenylammonium (TMPA) cations for Ca a+ was measured. The Langmuir isotherm equation did not adequately describe the experimental data, especially for small molecules, whereas the Dubinin-Radushkevich (DR) equation combined with a gamma-type adsorption energy distribution function described all experimental data well, suggesting the surface and structural heterogeneity of TMPA-smectites. The calculated adsorption energy distributions indicated that the apparent heterogeneity depends on the molecular size of adsorbates. Small adsorbate molecules such as benzene explore a highly heterogeneous surface of TMPA-smectites while large molecules such as n-propylbenzene detect a relatively homogeneous surface. The surface fractal dimension was dependent on the extent of TMPA exchange for Ca z+. When TMPA content is less than 75% of the cation exchange capacity (CEC) of the smectite, the heterogeneity decreases as TMPA content increases; it increases with TMPA content thereafter. These results are related to the size distribution of micropores in TMPAsmectites, which are defined by the 2 semi-infinite aluminosilicate sheets and the interlayer cations. The micropore size distributions and, hence, heterogeneity are created in part by the inhomogeneity of the charge density of clay surfaces and the tendency for cation segregation in these systems.

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Application of Dubinin—Radushkevich—type equation for describing bisolute adsorption from dilute aqueous solutions on activated carbon

Cited by 39 publications

References 11 publications

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO₂ capture

Surface Heterogeneity of Trimethylphenylammonium-Smectite as Revealed by Adsorption of Aromatic Hydrocarbons from Water

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Application of Dubinin—Radushkevich—type equation for describing bisolute adsorption from dilute aqueous solutions on activated carbon

Cited by 39 publications

References 11 publications

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO2 capture

Surface Heterogeneity of Trimethylphenylammonium-Smectite as Revealed by Adsorption of Aromatic Hydrocarbons from Water

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Characterization of hypercrosslinked polymer adsorbent based on carbazole to achieve higher CO₂ capture