Activation of biochar obtained from slow pyrolysis of the macauba coconut residue for removing uranium from aqueous solutions
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2018
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BIOCHAR
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Resumo
Macauba (Acrocomiaaculeata) is a palm tree native to the savannah-like area of Central Brazil.
As a result of the oil extraction from its coconuts, a dark stiff residue, the “endocarp”, rich in
lignin content, has a potential for being exploited as feedstock for biochar production. This study
investigates the activation of biochar obtained from slow pyrolysis of the macauba coconut
residue in order to remove uranium from aqueous solutions. The non-activated biochar, referred
to as “BC350”, is produced at a pyrolytic temperature of 350°C under Ar atmosphere and a 1-
hour residence time. The activated biochar was produced the same way and was further
subjected to activation via physical route using CO2 at 850°C for 120 min. The product of this
treatment was named “BC350-A”. Both biochars were characterized by specific surface area.
The surface area increased from 0.832 (untreated biochar) to 643.12 m2 g-1, confirming the
improvement of the porosity. The removal efficiency for uranyl ions (U(VI)) increased from 80.5
(untreated biochar) to 99.2% for 5 mg L-1 initial concentration solution adjusted to pH 3 using a
10 g L-1dosage. Adsorption isotherms were employed to represent the results of the U
adsorption onto the BC350-A. An estimation of the best fit was performed by calculating
different deviation equations, also called error functions. The Redlich-Peterson isotherm model
was the most appropriate for fitting the experimental data. This hybrid model incorporates both
Langmuir and Freundlich’s isotherm functionalities. These results demonstrate that a valueadded
material can be produced, encouraging the exploration of thermochemical conversion of
lignocellulosic biomasses.
Como referenciar
GUILHEN, S.N.; ORTIZ, N.; IZIDORO, J.C.; FUNGARO, D.A. Activation of biochar obtained from slow pyrolysis of the macauba coconut residue for removing uranium from aqueous solutions. In: BIOCHAR, August 20-23, 2018, Wilmington, Delaware, USA. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/29734. Acesso em: 24 Apr 2024.
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.