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

Chemical modification of hydrochar to obtain a robust and low cost material for CO2 uptake. [Display omitted] •Reversible CO2 capture is possible on Co-loaded amino-functionalized hydrochar.•Co incorporation reduces the surface basicity of amino-functionalized hydrochar.•Co loading favors structure...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-06, Vol.342, p.420-428
Main Authors: Vieillard, J., Bouazizi, N., Bargougui, R., Brun, N., Fotsing Nkuigue, P., Oliviero, E., Thoumire, O., Couvrat, N., Djoufac Woumfo, E., Ladam, G., Mofaddel, N., Azzouz, A., Le Derf, F.
Format: Article
Language:English
Subjects:
Chemical Sciences
CO2 adsorption
Cobalt nanoparticles
Hydrochar
Kinetic models
Surface modification
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Summary:Chemical modification of hydrochar to obtain a robust and low cost material for CO2 uptake. [Display omitted] •Reversible CO2 capture is possible on Co-loaded amino-functionalized hydrochar.•Co incorporation reduces the surface basicity of amino-functionalized hydrochar.•Co loading favors structure compaction and impedes direct CO2:NH2 interaction.•Weak non-contact CO2:NH2 interaction is favored at the expense of chemisorption.•Reversible CO2 capture is due to predominant physical condensation via weak interactions. 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.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2018.02.084