AdsorptionPub Date : 2026-04-30DOI: 10.1007/s10450-026-00690-3
Bhubesh Murugappan Balasubramaniam, Evelyn Forbes, Colin Picard, James A. Sawada, Arvind Rajendran
{"title":"Equilibrium and kinetic studies of unary CO2 and H2O adsorption on Lewatit VP OC 1065 for direct air capture of CO2","authors":"Bhubesh Murugappan Balasubramaniam, Evelyn Forbes, Colin Picard, James A. Sawada, Arvind Rajendran","doi":"10.1007/s10450-026-00690-3","DOIUrl":"10.1007/s10450-026-00690-3","url":null,"abstract":"<div><p>The study focuses on the characterization of Lewatit VP OC 1065, a reference sorbent for direct air capture of <span>({hbox {CO}_{2}})</span>, for its unary <span>({hbox {CO}_2})</span> and <span>({hbox {H}_{2}hbox {O}})</span> equilibria and sorption kinetics. Unary <span>({hbox {CO}_2})</span> and <span>({hbox {H}_{2}hbox {O}})</span> isotherms were obtained via static measurements and fit to the Toth and Guggenheim-Anderson-de Boer (GAB) isotherm models, respectively. Gravimetric uptake measurements were performed to estimate the sorption kinetics. Lewatit beads were crushed to different sizes to estimate the controlling resistance for <span>({hbox {CO}_2})</span> sorption. It was found that a portion of the resistance lies in the macropores of the sorbent, while the other is likely related to reaction kinetics. A series of micro-scale dynamic column breakthrough experiments was performed to evaluate equilibrium and kinetic parameters. The linear driving force (LDF) coefficient estimated for 400 ppm <span>({hbox {CO}_2})</span> at <i>T</i> = 30<span>(^{circ })</span> C via gravimetric and breakthrough experiments were <span>(3.7times 10^{-4}~{textrm{s}^{-1}})</span>, and <span>(2 times 10^{-3}~{textrm{s}^{-1}})</span>, respectively. Similarly, for <span>({hbox {H}_{2}hbox {O}})</span> at 15% relative humidity and <span>(30^{circ })</span> C, the LDF coefficient from gravitmetric and breakthrough experiments were <span>(3.38times 10^{-3}~{textrm{s}^{-1}})</span>, and <span>(7.0times 10^{-2}~{textrm{s}^{-1}})</span>, respectively. We postulate that this difference in LDF coefficients might be due to the unreliability of the sensors in detecting low compositions. Breakthrough experiments conducted suggest that the sorption kinetics increase with an increase in <span>({hbox {CO}_2})</span> composition and temperature.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 5","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147797190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Process, cost and environmental impact analysis of a solar adsorption cooling system for telecommunications Shelters","authors":"Nassima Bakhaled, Noureddine Cherrad, Khadra Aliouat, Djamel Selloum, Abdelmounam Ayad","doi":"10.1007/s10450-026-00686-z","DOIUrl":"10.1007/s10450-026-00686-z","url":null,"abstract":"<div><p>Algérie Télécom is a joint-stock company in the telecommunications networks and services sector. To protect its equipment from extreme weather, the company deploys Shelters globally, shielding the equipment from harsh climate conditions. However, these structures face challenges in dissipating internal heat generated by active equipment, especially in desert regions where summer temperatures in the shade exceed 45 °C. Maintaining an internal temperature below 35 °C is crucial for ensuring the proper functioning of the equipment. This study examines a more efficient solution based on solar-powered adsorption cooling using the AC35 activated carbon-methanol pair, backed by a developed thermodynamic model and a numerical simulation algorithm to analyze the system’s behavior. The results show that, over an ambient temperature range of 15 °C to 45 °C and heat dissipation from 1.5 kW to 8.5 kW, the thermal power exchanged by the desorber varies from 5.52 kW to 382.5 kW, while that of the condenser ranges from 3 to 200 kW. Additionally, the mass flow rate of the refrigerant fluid increases proportionally with the heat absorbed by the desorber, rising from 2.58 g/s to 175.62 g/s. Economically, adopting adsorption cooling would reduce total energy investment costs by 48.3%, saving approximately USD 394,600 per station. Furthermore, the environmental impact is significant, with CO₂ emissions reductions estimated between 1.1 and 6.6 tons per station annually.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 5","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147754430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-04-07DOI: 10.1007/s10450-026-00678-z
Stefano Brandani
{"title":"Understanding the vacancy solution theory","authors":"Stefano Brandani","doi":"10.1007/s10450-026-00678-z","DOIUrl":"10.1007/s10450-026-00678-z","url":null,"abstract":"<div><p>The vacancy solution theory is one of the approaches used to describe adsorbed phase non-ideality that leads to a flexible pure component isotherm and allows to predict or correlate multicomponent adsorption equilibrium. This contribution identifies the correct reference state and presents a new derivation of the theory applicable with any activity coefficient model. The definition of the reference state and the derivation identify clearly the requirement for thermodynamic consistency, which as for any model that reduces to the Langmuir multicomponent isotherm is that the saturation capacities of all components must be the same. A numerical example based on the thermodynamically consistent dual site Langmuir model for a hypothetical mixture that has an azeotrope is used to discuss the coupling of the non-random two liquid model with the vacancy solution theory and test its predictive ability.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 4","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00678-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-04-06DOI: 10.1007/s10450-026-00673-4
Tom R. C. Van Assche, Jennifer K. X. Pham Van, Sven Robijns, Michiel Dusselier, Joeri F. M. Denayer
{"title":"Insights in adsorptive cage and window effects in zeolites from a 1D energy barrier model","authors":"Tom R. C. Van Assche, Jennifer K. X. Pham Van, Sven Robijns, Michiel Dusselier, Joeri F. M. Denayer","doi":"10.1007/s10450-026-00673-4","DOIUrl":"10.1007/s10450-026-00673-4","url":null,"abstract":"<div><p>Non-monotonous trends in the Henry adsorption coefficient with respect to carbon number during the adsorption of <i>n</i>-alkanes are often categorized under the term “cage effects”. Recent experimental studies have shown that such effects emerge for a variety of cage-type CHA and AEI zeolite structures. Furthermore, observations of unusual kinetic effects (“window effects”) have been linked to this cage effect but remain controversial. Still, cage and window effects have been proposed to be generic for structures containing larger features (cages), separated by narrow openings. In this work, we present a simple 1D model based on rectangular free energy profiles for the individual CH<sub>x</sub> beads that compose the <i>n</i>-alkane chain. The descriptive model offers a prediction of both Henry and diffusion coefficient trends. Using the model, recent observations can be rationalized from the perspective of adsorption in larger cages and narrow openings. It is shown that the local minimum in Henry coefficient coincides with a local maximum in diffusion coefficient. Although the model does not account for even more complex adsorption mechanisms such as molecular coiling within cages, it demonstrates how such unusual effects can be predicted using only straightforward assumptions.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 4","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-27DOI: 10.1007/s10450-026-00683-2
Somayeh Zarei, Ju Weon Lee, Andreas Seidel-Morgenstern
{"title":"Effect of solvent composition on adsorption isotherms based on multi-component breakthrough curve analysis and application of a multi-component BET model","authors":"Somayeh Zarei, Ju Weon Lee, Andreas Seidel-Morgenstern","doi":"10.1007/s10450-026-00683-2","DOIUrl":"10.1007/s10450-026-00683-2","url":null,"abstract":"<div><p>Quantitative knowledge of competitive adsorption isotherms is essential for the design and optimization of adsorption-based separation processes. To adjust the retention times of the components to be separated in liquid phase applications, mixtures of two or more solvents are often selected as the mobile phase. The solvent composition thus has an influence on the courses of the adsorption isotherms. The paper presents the results of breakthrough curve (BTC) experiments considering the separation of three benzene derivatives characterized by different aliphatic carbon chains, exploiting conventional reversed-phase chromatography (RP18). As the mobile phase, different mixtures of acetonitrile (ACN) and water (W) were used. Equilibrium loadings were extracted from characteristic features of the observed BTCs for single components, binary mixtures, and ternary mixtures. The analysis ignored kinetic effects and exploited classical equilibrium theory. For an initially selected solvent composition, the courses of the isotherms revealed an anti-Langmuir behavior for the two longer retained components. All single-component and mixture equilibrium data could be well described with a newly derived widely applicable multi-component single-site BET adsorption model, assuming a finite number of adsorbed layers. The analysis was applied again to determine and analyze the courses of BTCs and the corresponding multi-component adsorption isotherms for three other solvent compositions. The slopes of the single-component isotherms changed significantly for the different components. The derived BET-type equation could again be used to describe rather well the isotherms for increasing amounts of ACN with specific numbers of adsorbed layers. For ACN/W = 90/10, the layer number approached unity and, thus, an almost perfect Langmuir behavior was identified. The identified trends between the solvent compositions and the estimated isotherms model parameters could be well described with the LSS model. Finally, suggestions were made for further improving the agreement between measured and predicted isotherms.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 4","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00683-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147561546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-22DOI: 10.1007/s10450-026-00685-0
K. V. Wagaskar, A. G. Banpurkar, Pradip B. Shelke
{"title":"Simulation studies of adsorption of circular discs on a substrate with pre-adsorbed circular defects by using Random Sequential Adsorption (RSA)","authors":"K. V. Wagaskar, A. G. Banpurkar, Pradip B. Shelke","doi":"10.1007/s10450-026-00685-0","DOIUrl":"10.1007/s10450-026-00685-0","url":null,"abstract":"<div><p>The Random sequential adsorption of circular discs on a two dimensional continuum substrate with pre-adsorbed circular defects is carried out using computer simulations. The defects are randomly distributed, and the adsorbing discs do not overlap with the defects. Simulations are run for different values of the fractional coverage of defects, <span>(rho )</span>, and the size ratio of defect particles to depositing particles, <span>(sigma )</span>. The kinetics of deposition follow a power law <span>({(theta }_{max}-theta (t)) sim { t}^{-eta })</span>, where <span>({theta }_{max})</span> and <span>(theta (t))</span> are maximum and instantaneous surface coverage, respectively. The value of <span>({theta }_{max})</span> is found to vary from 0.370 to 0.483 for <span>(rho =0.1)</span>, from 0.283 to 0.451 for <span>(rho =0.15)</span> and from 0.194 to 0.415 for <span>(rho =0.2)</span> when <span>(sigma )</span> increases from 0.2 to 10. In general, the exponent <span>(eta )</span> is found to increase with <span>(sigma )</span> for a given value of <span>(rho )</span>. Also, it is found that for a given <span>(sigma )</span>, the value of the exponent, <span>(eta )</span>, is found to decrease with the increase in <span>(rho )</span>. Pair correlation functions of deposited discs and the pore size distribution are calculated to study the microstructural properties of monolayers of discs upon deposition. The minimum porosity condition for the deposited monolayers is determined in terms of specific parameters <span>(rho )</span> and <span>(sigma )</span>. For a given value of <span>(rho )</span>, the value of the <span>(sigma )</span> can be adjusted to achieve minimum porosity. The deviation from minimum porosity condition increases the porosity of the surface. Hence, one can tune the porosity of the adsorbed layer at a desired surface coverage. Pair correlation between adsorbed particles shows the increase in number of nearest neighbours with <span>(sigma .)</span></p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 4","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-19DOI: 10.1007/s10450-026-00679-y
Lucas J. dos Santos, Iuri S. V. Segtovich, Amaro G. Barreto Jr., Frederico W. Tavares
{"title":"Understanding the deformation of IRMOF-1 during carbon dioxide and argon adsorption from hybrid Monte Carlo/molecular dynamics simulations","authors":"Lucas J. dos Santos, Iuri S. V. Segtovich, Amaro G. Barreto Jr., Frederico W. Tavares","doi":"10.1007/s10450-026-00679-y","DOIUrl":"10.1007/s10450-026-00679-y","url":null,"abstract":"<div><p>Adsorption-induced deformation in porous materials refers to the structural change that occurs due to the adsorption of guest molecules. This effect can be neglected for many systems because the variation in pore volume is practically zero. This fact led to the hypothesis of a rigid pore structure, which in turn gave rise to numerous adsorption models. However, for many new porous materials, such as metal-organic frameworks (MOFs), the effects of these deformations are significant and specific for different components and temperatures, requiring detailed models. The hybrid Monte Carlo/molecular dynamics method is the most direct approach for capturing volumetric deformation during adsorption. However, this method involves multiple iterations of Grand Canonical Monte Carlo (GCMC) and molecular dynamics simulations in an NPT ensemble (NPT-MD), which requires computer optimization to reduce computational time. In this work, we develop an efficient iterative GCMC/NPT-MD method, leveraging the GPU parallelization of gRASPA and GROMACS software, to study the effects of flexibility in IRMOF-1. Using this framework, we analyze the deformation of IRMOF-1 during the adsorption of CO<span>(_2)</span> and Ar, systematically evaluating the influence of key simulation parameters, including the size of the simulation box and the non-bonded cutoff radius.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00679-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-19DOI: 10.1007/s10450-026-00675-2
Takahiro Ueda, Yuta Yamada, Kota Fujii, Ryota Mihara, Taku Iiyama, Yasutaka Hamada, Mitsutaka Okumura
{"title":"Intermolecular interactions governing adsorption of bulky molecules on ZIF-8: Insight from adsorption kinetics of benzene and 6-membered ring alicyclic hydrocarbons","authors":"Takahiro Ueda, Yuta Yamada, Kota Fujii, Ryota Mihara, Taku Iiyama, Yasutaka Hamada, Mitsutaka Okumura","doi":"10.1007/s10450-026-00675-2","DOIUrl":"10.1007/s10450-026-00675-2","url":null,"abstract":"<div><p>This study examined the adsorption kinetics of benzene and six-membered ring alicyclic hydrocarbons on Zeolitic imidazolate framework-8 (ZIF-8) to elucidate the interactions between the adsorbed molecules and linkers on the adsorption behavior of bulky molecules. The temperature dependence of the apparent Fickian diffusion coefficient was analyzed to determine the activation entropy and energy of diffusion. The significant negative values observed for the activation entropy, from − 170 to − 220 J K<sup>− 1</sup> mol<sup>− 1</sup>, indicate a restriction on the degree of freedom of the adsorbate molecules within the diffusion transition state, thereby reducing the apparent diffusion coefficients. The molecular orientations of the adsorbate molecules traversing the ZIF-8 aperture were investigated using Monte Carlo simulations. Order parameter analysis revealed that the molecular orientation was constrained to minimize the energy barrier with passage through the aperture. Fourier-transform infrared (FT-IR) spectroscopy and <sup>13</sup>C cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR) measurements supported the CH-π interactions between the adsorbate molecules and 2-methylimidazolate linkers. This interaction maintained the orientation of the adsorbate molecules, facilitating their passage through the ZIF-8 apertures. CH-π interactions influence molecular orientation control in the adsorption and diffusion of large molecules containing π electrons in porous materials with organic ligands.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00675-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-19DOI: 10.1007/s10450-026-00684-1
Victoria T. Adeleke, Khalid Osman, Madison Lasich
{"title":"Integrating quantum and atomistic simulations to study pharmaceutical adsorption on graphene oxide/polyvinyl alcohol composites for water remediation","authors":"Victoria T. Adeleke, Khalid Osman, Madison Lasich","doi":"10.1007/s10450-026-00684-1","DOIUrl":"10.1007/s10450-026-00684-1","url":null,"abstract":"<div><p>The design of polymer-carbon nanocomposites with enhanced adsorption efficiency for emerging contaminants is critical for sustainable water remediation. Graphene-polymer composites are increasingly explored for their potential in the adsorption of organic material, but the molecular mechanisms governing the adsorption and interfacial miscibility remain poorly understood. This study used a multiscale computational framework, integrating quantum and all–atom molecular dynamics simulations with a thermodynamic Flory-Huggins free energy of mixing analysis to elucidate adsorption energetics and the bulk thermodynamic miscibility of graphene oxide (GO)/polyvinyl alcohol (PVA) composites with pharmaceuticals. This multiscale approach provided a prediction of adsorbent–adsorbate interactions consistent with experimental trend-based observation, validating GO–PVA as an efficient hybrid matrix for pharmaceutical adsorption, with the adsorption strength strongly dependent on the molecular structure of the pollutants. The hydrogen bonding and π-π stacking interactions are the predominant binding modes, while the dominant interaction type is physisorption, though chemisorption occurred in a few high-binding-energy adsorbent-adsorbate complexes. Temperature-dependent Flory-Huggins free energy analysis indicated that GO–PVA–H<sub>2</sub>O systems possess highly favorable mixing thermodynamics, whereas neat PVA–H<sub>2</sub>O interactions remain unfavorable, highlighting the hydrophilic enhancement conferred by GO. The combined results suggest that GO–PVA composites not only improve water compatibility but also enhance the affinity for pharmaceutical adsorption. Among the tested drugs with consensus rankings, irbesartan and ketoprofen showed the highest affinities toward GO, PVA, and GO–PVA composites. This study provides valuable molecular-level insights supporting the use of GO–PVA composites as promising adsorbents for the removal of pharmaceuticals from aqueous environments.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AdsorptionPub Date : 2026-03-19DOI: 10.1007/s10450-026-00687-y
Henrry Ortega-Ortiz, Maria Bernardo, Inês Matos, Isabel Fonseca, José P.B Mota, Jakpar Jandosov, Rui P.P.L. Ribeiro
{"title":"Rice husk-based activated carbon honeycomb monolith for biogas upgrading and CO2 capture from flue gases","authors":"Henrry Ortega-Ortiz, Maria Bernardo, Inês Matos, Isabel Fonseca, José P.B Mota, Jakpar Jandosov, Rui P.P.L. Ribeiro","doi":"10.1007/s10450-026-00687-y","DOIUrl":"10.1007/s10450-026-00687-y","url":null,"abstract":"<div><p>Structured adsorbents offer important advantages over conventional bead- or pellet-shaped materials used in fixed-bed gas separation processes. In particular, monolithic architectures can reduce pressure drop and enhance mass and heat transfer, leading to improved process performance. In this work, an activated carbon honeycomb monolith (ACHM) was produced from rice husk through extrusion, carbonization and CO<sub>2</sub> activation. The material was characterized by N<sub>2</sub> physisorption at 77 K, mercury porosimetry and scanning electron microscopy (SEM), confirming a hierarchical porous structure. Thermogravimetric analysis indicated thermal stability up to 873 K. Adsorption equilibrium isotherms of carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>) and nitrogen (N<sub>2</sub>) were obtained at 303, 323, 348 and 373 K using a manometric method. The ACHM exhibited a higher affinity towards CO<sub>2</sub>, followed by CH<sub>4</sub> and N<sub>2</sub>. The adsorption equilibrium data were accurately correlated using the Dual-Site Langmuir and Toth models. Dynamic single component breakthrough experiments were performed and the results fitted to a mathematical model to determine mass and heat transfer parameters. These were subsequently used to predict the multicomponent breakthrough curves, which consisted in binary mixtures of CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub>. The CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH4 selectivities at 1 bar and 303 K were ca. 18 and 4, respectively, demonstrating the good potential of the rice husk-based ACHM for adsorption-based processes targeting CO<sub>2</sub> removal from flue gases and biogas.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"32 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-026-00687-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}