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Lookup NU author(s): Dr Khalil Hassan, Professor Lidija SillerORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Flue gas is considered a major contributor to greenhouse gas emissions. Among the available separation technologies, pressure swing adsorption (PSA) is widely applied, where the choice of adsorbent critically determines system performance. In this study, hybrid aerogels named MTGO, MTR10, and MTR20 were synthesized to provide heterogeneous surfaces in addition to providing hydroxyl groups as adsorption sites and promoting the adsorption efficiency of carbon dioxide. To determine the most effective adsorbents for capturing CO2, adsorption studies were conducted on the newly developed adsorbents under various conditions. The hybrid aerogels exhibited significant CO2 adsorption capacities, with MTR20 demonstrating the highest performance, attributed to its larger surface area and optimized pore structure. The Avrami model, which captured both the underlying adsorption processes and kinetic behavior, was shown to be the best appropriate for characterizing the adsorption process by kinetic investigations. Isotherm analysis demonstrated that the Freundlich model best described the adsorption behavior, suggesting a heterogeneous, multilayer adsorption process. Moreover, all materials showed exothermic adsorption; MTR20 showed the strongest contacts and the highest spontaneity, suggesting that it might be used for effective CO2 collection at higher temperatures. MTR20 also demonstrated the least amount of decrease in CO2 absorption under various humidity conditions likely due to its high hydrophobicity and low affinity for water. Regeneration experiments confirmed that all materials exhibited excellent stability and reusability across multiple adsorption-desorption cycles, with no significant degradation in performance.
Author(s): Hassan KT, Shihab MA, Najah Saud A, Almoneef MM, Siller L
Publication type: Article
Publication status: Published
Journal: Surfaces and Interfaces
Year: 2025
Volume: 72
Print publication date: 01/09/2025
Online publication date: 27/06/2025
Acceptance date: 25/06/2025
Date deposited: 02/07/2025
ISSN (print): 2468-0230
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.surfin.2025.107063
DOI: 10.1016/j.surfin.2025.107063
ePrints DOI: 10.57711/v99c-yt47
Data Access Statement: Data will be made available on request.
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