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

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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https://hal.univ-lorraine.fr/hal-03562754
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Submitted on : Wednesday, February 9, 2022 - 11:25:42 AM
Last modification on : Thursday, February 10, 2022 - 11:23:50 AM
Long-term archiving on: : Tuesday, May 10, 2022 - 6:34:13 PM

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Flavia 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, MDPI AG, 2017, 5 (1), pp.7. ⟨10.3390/inorganics5010007⟩. ⟨hal-03562754⟩

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