Synthesis and characterization of Cu doped activated carbon beads from chitosan
Guy, Fabrice; Runtti, Hanna; Duclaux, Laurent; Ondarts, Michel; Reinert, Laurence; Outin, Jonathan; Gonze, Evelyne; Bonnamy, Sylvie; Soneda, Yasushi (2021-05-06)
Guy, F., Runtti, H., Duclaux, L., Ondarts, M., Reinert, L., Outin, J., Gonze, E., Bonnamy, S., & Soneda, Y. (2021). Synthesis and characterization of Cu doped activated carbon beads from chitosan. Microporous and Mesoporous Materials, 322, 111147. https://doi.org/10.1016/j.micromeso.2021.111147
© 2021 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2022041328877
Tiivistelmä
Abstract
New types of Cu-doped spherical-shaped activated carbons were prepared by pyrolysis at 700 °C of chitosan hydrogels impregnated with KOH at ratios (mKOH/mchitosan) ranging from 22.5% to 135%. At KOH impregnation ratio lower than 63%, the precursor Cu doping allowed obtaining bead-shaped activated carbons (diameter ~ 2 mm) and the highest specific surface areas (1145 m² g⁻¹). The absence of copper doping yielded to activated carbon powders whatever the KOH impregnation ratio. As increasing the impregnation ratio higher than 63%, the materials porosity type turns from exclusively microporous to both microporous and mesoporous. The microporous volume, determined by N₂ adsorption at 77 K and CO₂ adsorption at 273 K, attains a maximum (about 0.5 cm³ g⁻¹) for a 63% impregnation ratio. Scanning Electron Microscopy (SEM) images show a multi-scale porosity for a KOH impregnation ratio higher than 45%. Nanoparticles of Cu and CuO were identified by SEM and Transmission Electron Microscopy in the ACs beads prepared from copper-doped chitosan. Whatever the composition, the beads are formed of N-enriched carbons showing mainly pyridinic and pyrrolic groups evidenced by XPS.
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