Cocoa shell-deriving hydrochar modified through aminosilane grafting and cobalt particle dispersion as potential carbon dioxide adsorbent - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Chemical Engineering Journal Année : 2018

Cocoa shell-deriving hydrochar modified through aminosilane grafting and cobalt particle dispersion as potential carbon dioxide adsorbent

N. Couvrat
G. Ladam

Résumé

This work was achieved to investigate the effect of both aminopropyltriethoxysilane (APTES) grafting and cobalt particle incorporation on the CO2 adsorption behavior of cocoa shell based hydrochar (HC). Electron microscopy and measurements using nitrogen adsorption-desorption isotherms showed a structure swelling after APTES grafting, followed by a compaction after Co particle insertion that attenuates the surface basicity. HC-APTES-Co displayed higher CO2 retention capacity than its metal-free counterpart, in spite of its lower basicity and porosity. CO2 adsorption was found to obey pseudo-first order kinetics and intra-particle diffusion mechanisms due to the predominance of physical interaction. This favors CO2 condensation of higher CO2 amount than predicted by the stoichiometry of carbamate formation. This concept allows envisaging promising prospects for plant-deriving adsorbents intended for CO2 concentration and valorization into added values products.Graphical abstractChemical modification of hydrochar to obtain a robust and low cost material for CO2 uptake.

Domaines

Chimie
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Dates et versions

hal-01863095 , version 1 (28-08-2018)

Identifiants

Citer

Julien Vieillard, Nabil Bouazizi, Radhouane Bargougui, Nicolas Brun, P. Fotsing Nkuigue, et al.. Cocoa shell-deriving hydrochar modified through aminosilane grafting and cobalt particle dispersion as potential carbon dioxide adsorbent. Chemical Engineering Journal, 2018, 342, pp.420-428. ⟨10.1016/j.cej.2018.02.084⟩. ⟨hal-01863095⟩
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