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Journal Articles Inorganics Year : 2017

Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

Flavia L Braghiroli
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Vanessa Fierro
Andrzej Szczurek
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Philippe Gadonneix
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Jaafar Ghanbaja
Ghouti Medjahdi
Alain Celzard

Abstract

In the present paper, porous materials were prepared from the hydrothermal treatment of aqueous solutions of tannin, a renewable phenolic resource extracted from tree barks, containing dissolved salts of transition metals: V, Cr, Ni and Fe. Hydrothermal treatment produced carbonaceous particles doped with the aforementioned metals, and such materials were treated according to two different routes: (i) calcination in air in order to burn the carbon and to recover porous oxides; (ii) pyrolysis in inert atmosphere so as to recover porous metal/carbon hybrid materials. The nature of the metal salt was found to have a dramatic impact on the structure of the materials recovered by the first route, leading either to nano-powders (V, Cr) or to hollow microspheres (Ni, Fe). The second route was only investigated with iron, leading to magnetic Fe-loaded micro/mesoporous carbons whose texture, pore volumes and surface areas gradually changed with the iron content.
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hal-03562754 , version 1 (09-02-2022)

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Flavia L Braghiroli, Vanessa Fierro, Andrzej Szczurek, Philippe Gadonneix, Jaafar Ghanbaja, et al.. Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials. Inorganics, 2017, 5 (1), pp.7. ⟨10.3390/inorganics5010007⟩. ⟨hal-03562754⟩
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