Pyrolytic temperature evaluation of macauba biochar for uranium adsorption from aqueous solutions
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2019
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Biomass and Bioenergy
Resumo
This study aims to evaluate the effect of the pyrolytic temperature on the biochar derived from the macauba
endocarp for the removal of uranium (VI) from aqueous solutions. The endocarp was subjected to six different
pyrolytic temperatures, ranging from 250 °C to 750 °C. The biochars obtained at each temperature were evaluated
for their adsorption capacities (“q”). The highest adsorption capacities were obtained for the biochar
produced at 250 °C (BC250), followed by the one obtained at 350 °C (BC350), with removal efficiencies of 86%
and 80%, respectively. The best condition was achieved when the endocarp was subjected to temperatures
between 300 and 350 °C, at which it was possible to obtain a satisfactory balance among adsorption capacity,
gravimetric yield and fixed carbon content. This characteristic, combined with the high removal efficiency,
points to an ideal working temperature of 350 °C. Elemental analysis showed a decrease of the H/C and O/C
ratios when higher pyrolytic temperatures were applied, indicating an inverse relationship between the carbonization
and the surface polar functional groups, which were likely responsible for an increased adsorptive
capacity in biochars produced at lower temperatures. Both FTIR and XPS analysis indicated that oxygen-containing
groups such as hydroxyls and carboxylic acids were involved with the binding of uranyl ions.
Como referenciar
GUILHEN, S.N.; MASEK, O.; ORTIZ, N.; IZIDORO, J.C.; FUNGARO, D.A. Pyrolytic temperature evaluation of macauba biochar for uranium adsorption from aqueous solutions. Biomass and Bioenergy, v. 122, p. 381-390, 2019. DOI: 10.1016/j.biombioe.2019.01.008. Disponível em: http://repositorio.ipen.br/handle/123456789/30024. Acesso em: 13 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.