Ulrich Legrand, Juan-Ricardo Castillo-Sánchez, Richard Boudreault, Jean-Luc Meunier, Pierre-Luc Girard Lauriault et Jason Robert Tavares
Article de revue (2022)
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Libre accès au plein texte de ce document Version finale avant publication Conditions d'utilisation: Creative Commons: Attribution-Pas d'utilisation commerciale-Pas de modification (CC BY-NC-ND) Télécharger (1MB) |
Abstract
The thermodynamic properties of various sorbents, namely carbon-based sorbents, silica gel and metal–organic frameworks (MOFs) were assessed and compared based on their adsorption isotherms at 25, 30 and 35 ◦C. The isotherms were measured in a custom-made and calibrated environmental chamber using a gravimetric method. Gibbs free energy demonstrated the spontaneity of the adsorption process and the hygroscopicity variation of the sorbents depending on their surface chemistry. The carbon-based sorbent, nanoporous sponges (NPS), and one of the MOFs, Cr-MIL-101, had lower sorbent-adsorbate interactions and thus had integral enthalpies converging rapidly to the heat of vaporization of pure water. As such, these samples would release less heat during an adsorption step with partial filling of the sorbent. Integral entropy showed that, for most of the environmental conditions, adsorbed water molecules had an entropy equivalent to pure water for most of the sorbent materials, except for silica gel, due to its higher energy sites and higher water-sorbent interactions. NPS and Cr-MIL-101 were shown to be entropically advantageous for the recovery/removal of water. Enthalpy and entropy can provide insight to select favorable conditions to perform adsorption–desorption cycles in a practical water capture system.
Mots clés
sorbents, water adsorption, Gibbs free energy, enthalpy of adsorption, entropy
Sujet(s): | 1800 Génie chimique > 1800 Génie chimique |
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Département: | Département de génie chimique |
Centre de recherche: |
CRCT - Centre de recherche en calcul thermochimique CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance |
Organismes subventionnaires: | Natural Sciences and Engineering Research Council of Canada (NSERC), Prima, Mitacs, Awn Nanotech Inc. |
Numéro de subvention: | CRDPJ 522391-17, R16-46-003, IT16469 |
URL de PolyPublie: | https://publications.polymtl.ca/50425/ |
Titre de la revue: | Chemical Engineering Journal (vol. 431, no part 2) |
Maison d'édition: | Elsevier B.V. |
DOI: | 10.1016/j.cej.2021.134058 |
URL officielle: | https://doi.org/10.1016/j.cej.2021.134058 |
Date du dépôt: | 18 avr. 2023 14:58 |
Dernière modification: | 08 avr. 2024 03:13 |
Citer en APA 7: | Legrand, U., Castillo-Sánchez, J.-R., Boudreault, R., Meunier, J.-L., Girard Lauriault, P.-L., & Tavares, J. R. (2022). Fundamental thermodynamic properties of sorbents for atmospheric water capture. Chemical Engineering Journal, 431(part 2), 134058 (8 pages). https://doi.org/10.1016/j.cej.2021.134058 |
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