Advanced interpretation of CO2 adsorption thermodynamics onto porous solids by statistical physics formalism

Wjihi, Sarra; Aouaini, Fatma; Erto, Alessandro; Balsamo, Marco; Lamine, Abdelmottaleb Ben

doi:10.1016/j.cej.2020.126669

Cited by 32 publications

(21 citation statements)

References 33 publications

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“…Thus, the higher content of lignin may explain the increase in CO 2 capture. The pH PCZ seems to play a secondary role in CO 2 adsorption, Wjihi et al (2021) [ 127 ] reported that a higher pH PCZ resulted in higher adsorption capacity. FIB.700 showed an adsorption capacity of 54.59 mg g −1 , ALM.700 presented 48.87 mg g −1, and DOA.700 exhibited an adsorption capacity of 51.76 mg g −1 , respectively ( Figure 6 ).…”

Section: Resultsmentioning

confidence: 99%

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

et al. 2022

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This work valorizes butiá pomace (Butia capitata) using pyrolysis to prepare CO2 adsorbents. Different fractions of the pomace, like fibers, endocarps, almonds, and deoiled almonds, were characterized and later pyrolyzed at 700 °C. Gas, bio-oil, and biochar fractions were collected and characterized. The results revealed that biochar, bio-oil, and gas yields depended on the type of pomace fraction (fibers, endocarps, almonds, and deoiled almonds). The higher biochar yield was obtained by endocarps (31.9%wt.). Furthermore, the gas fraction generated at 700 °C presented an H2 content higher than 80%vol regardless of the butiá fraction used as raw material. The biochars presented specific surface areas reaching 220.4 m2 g−1. Additionally, the endocarp-derived biochar presented a CO2 adsorption capacity of 66.43 mg g−1 at 25 °C and 1 bar, showing that this material could be an effective adsorbent to capture this greenhouse gas. Moreover, this capacity was maintained for 5 cycles. Biochars produced from butiá precursors without activation resulted in a higher surface area and better performance than some activated carbons reported in the literature. The results highlighted that pyrolysis could provide a green solution for butiá agro-industrial wastes, generating H2 and an adsorbent for CO2.

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Section: Resultsmentioning

confidence: 99%

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

et al. 2022

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“…The reaction of adsorption for adsorbate molecules (P) onto receptor sites of adsorbent (M) is as follows: where n is the stoichiometric coefficient of reaction, the n parameter can be an integer value or not. The values of n smaller than the unity indicate that the multi-anchorage adsorption mechanism may occur, while those greater than the unity represent the assumption of a multi-molecular adsorption mechanism 46 . In this context, a single layer adsorption process and or two or more adsorption layers may be considered adsorption isotherm.…”

Section: Adsorption Modelingmentioning

confidence: 99%

Toward a mechanistic understanding of adsorption behavior of phenol onto a novel activated carbon composite

Allahkarami

Monfared

Silva

et al. 2023

Sci Rep

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In this research, the solid–liquid adsorption systems for MSAC (PbFe2O4 spinel-activated carbon)-phenol and pristine activated carbon-phenol were scrutinized from the thermodynamics and statistical physics (sta-phy) viewpoints. Experimental results indicated that MSAC composite outperformed pristine AC for the uptake of phenol from waste streams. By increasing the process temperature, the amount of phenol adsorbed onto both adsorbents, MSAC composite and pristine AC, decreased. Thermodynamic evaluations for MSAC demonstrated the spontaneous and exothermic characteristics of the adsorption process, while positive values of ΔG for pristine AC indicated a non-spontaneous process of phenol adsorption in all temperatures. In a mechanistic investigation, statistical physics modeling was applied to explore the responsible mechanism for phenol adsorption onto the MSAC composite and pristine AC. The single-layer model with one energy was the best model to describe the experimental data for both adsorbents. The adsorption energies of phenol onto both adsorbents were relatively smaller than 20 kJ/mol, indicating physical interactions. By increasing temperature from 298 to 358 K, the value of the absorbed amount of phenol onto the MSAC composite and pristine AC at saturation (Qsat) decreased from 158.94 and 138.91 to 115.23 and 112.34 mg/g, respectively. Mechanistic studies confirm the significant role of metallic hydroxides in MSAC to facilitate the removal of phenol through a strong interaction with phenol molecules, as compared with pristine activated carbon.

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“…Determination of these parameters is significant because it substantiates the nature of CO 2 adsorption, whether the process belongs to physical (physisorption) or chemical adsorption (chemisorption). Regardless of the significance of thermodynamic measurement, Wjihi et al 35 reported that this analysis is rarely the focus of study; thereby, further work in this area is promising, as it helps in understanding the adsorption mechanisms. Based on Fundamentally, E a value of ≤42 kJ/mol refers to diffusion-controlled process, whereas a higher value indicates the occurrence of a chemical reaction.…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

The insights of pet cokes/palm kernel shell activated carbon as CO₂ adsorbent: equilibrium, kinetics, thermodynamics, and regeneration performance

Rashidi

Yusup

2022

J of Chemical Tech & Biotech

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BACKGROUND: Over the years, activated carbon has been widely used for environmental applications, including liquid or gas phase applications. However, there are many hurdles for researchers in the activated carbon field to overcome when it comes to non-renewable materials, the utilization of individual precursors, and the complex multistep procedures of activated carbon synthesis. Therefore, in this study, the facile mechanochemical potassium carbonate (K 2 CO 3 ) activation of blended precursors palm kernel shell and petroleum cokewas investigated in terms of the activated carbon yield and carbon dioxide (CO 2 ) adsorption capacity. RESULTS:The optimum configuration of the activated carbon production was found at temperature of 680°C, holding time of 60 min, and impregnation ratio of 1.75:1. The CO 2 adsorption data at 25-120°C was best represented by the Sips model with R 2 > 0.9999, where maximum CO 2 adsorption capacity (q max ) was within the range of 2.24-4.32 mmol/g. The kinetic analysis was well-represented by the pseudo-second order model due to the high R 2 and low sum of square of errors (ERRSQ) value. In terms of thermodynamic analysis, it showed that the CO 2 adsorption process was physical, exothermic, and spontaneous at lower temperature. CONCLUSION: Overall, the integration of agricultural and industrial waste to value-added activated carbon was feasible not only in reducing waste disposal problems but also in facilitating CO 2 mitigation.

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Advanced interpretation of CO2 adsorption thermodynamics onto porous solids by statistical physics formalism

Cited by 32 publications

References 33 publications

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Toward a mechanistic understanding of adsorption behavior of phenol onto a novel activated carbon composite

The insights of pet cokes/palm kernel shell activated carbon as CO₂ adsorbent: equilibrium, kinetics, thermodynamics, and regeneration performance

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Advanced interpretation of CO2 adsorption thermodynamics onto porous solids by statistical physics formalism

Cited by 32 publications

References 33 publications

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Valorization of Different Fractions from Butiá Pomace by Pyrolysis: H2 Generation and Use of the Biochars for CO2 Capture

Toward a mechanistic understanding of adsorption behavior of phenol onto a novel activated carbon composite

The insights of pet cokes/palm kernel shell activated carbon as CO2 adsorbent: equilibrium, kinetics, thermodynamics, and regeneration performance

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The insights of pet cokes/palm kernel shell activated carbon as CO₂ adsorbent: equilibrium, kinetics, thermodynamics, and regeneration performance