Uranium removal from aqueous solution using macauba endocarp-derived biochar
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2021
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Environmental Pollution
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The main aim of this study was to evaluate options for addressing two pressing challenges related to
environmental quality and circular economy stemming from wastage or underutilization of abundant
biomass residue resources and contamination of water by industrial effluents. In this study we focused
on residues (endocarp) from Macaúba palm (Acrocomia aculeata) used for oil production, its conversion
to activated biochar, and its potential use in uranium (U) removal from aqueous solutions. Batch
adsorption experiments showed a much higher uranyl ions (U(VI)) removal efficiency of activated biochar
compared to untreated biochar. As a result of activation, an increase in removal efficiency from
80.5% (untreated biochar) to 99.2% (after activation) was observed for a 5 mg L 1 initial U(VI) concentration
solution adjusted to pH 3 using a 10 g L 1 adsorbent dosage. The BET surface area increased from
0.83 to 643 m2 g 1 with activation. Surface topography of the activated biochar showed a very characteristic
morphology with high porosity. Activation significantly affected chemical surface of the biochar.
FTIR analysis indicated that U(VI) was removed by physisorption from the aqueous solution. The
adsorbed U(VI) was detected by micro X-ray fluorescence technique. Adsorption isotherms were
employed to represent the results of the U adsorption onto the activated biochar. 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, suggesting
heterogeneity of adsorption sites with different affinities for uranium setting up as a hybrid adsorption.
These results demonstrated that physical activation significantly increases the adsorption capacity of
macauba endocarp-derived biochar for uranium in aqueous solutions, and therefore open up a potential
new application for this type of waste-derived biochar.
Como referenciar
GUILHEN, SABINE N.; ROVANI, SUZIMARA; ARAUJO, LEANDRO G. de; TENORIO, JORGE A.S.; MASEK, ONDREJ. Uranium removal from aqueous solution using macauba endocarp-derived biochar: effect of physical activation. Environmental Pollution, v. 272, p. 1-10, 2021. DOI: 10.1016/j.envpol.2020.116022. Disponível em: http://repositorio.ipen.br/handle/123456789/31931. Acesso em: 20 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.