Adsorption Energy and Pore-Size Distributions of Activated Carbons Calculated Using Hill's Model

Torkia, Yosra Ben; Bouaziz, Nadia; Al‐Muhtaseb, Shaheen A.; Lamine, Abdelmottaleb Ben

doi:10.1260/0263-6174.32.7.571

Cited by 11 publications

(2 citation statements)

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“…The pore size distribution (PSD) is very important basic information (i.e., the morphology of the AWAC and WSAC adsorbent surfaces) for porous materials such as activated carbons to determine the density of the pores as a function of pore width [ 42 ]. While the SED in the following section describes the heterogeneity of the adsorbent surface in terms of energy, here the PSD focuses on the geometric or structural heterogeneity of the adsorbent surface [ 43 ]. Statistical physical formalism, Kelvin’s law, and the adsorption isotherm of a double-layer model with two energies were utilized to obtain PSD data, and this method is called the new Kelvin method [ 44 ].…”

Section: Methodsmentioning

confidence: 99%

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Adsorption of Congo Red and Methylene Blue onto Nanopore-Structured Ashitaba Waste and Walnut Shell-Based Activated Carbons: Statistical Thermodynamic Investigations, Pore Size and Site Energy Distribution Studies

et al. 2022

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In this paper, an advanced statistical physics adsorption model (double-layer model with two energies) is successfully established. On the basis of this model, statistical thermodynamic functions (e.g., entropy (S), Gibbs free enthalpy (G), and internal energy (Eint)), pore size distribution (PSD), and site energy distribution (SED) functions were successfully developed and applied to investigate the adsorption mechanisms of nanopore-structured ashitaba waste-based activated carbons (AWAC) and walnut shell-based activated carbons (WSAC) on Congo red (CR) and methylene blue (MB) dyes in aqueous solutions. Statistical thermodynamic results indicated that the adsorption reactions involved in this study are entropy-increasing, endothermic, and spontaneous in nature. Furthermore, PSD and SED described the heterogeneity of these adsorbents in terms of geometry or structure and energy and illustrated that the aforementioned adsorption processes are endothermic physisorption. All in all, this study contributed to broadening the understanding of the adsorption mechanisms of dye molecules onto biomass-based activated carbons.

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Section: Methodsmentioning

confidence: 99%

“…The integral of Equation (26) represents the area under the PSD curve and can also characterize the magnitude of saturated adsorption capacity ( Q sat ) as shown in Equation (27) [ 43 ].

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Section: Methodsmentioning

confidence: 99%