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Biosorption optimization of Ni2+ ions on Macauba (Acrocomia aculeata) oil extraction residue using fixed-bed column

quarta-feira, março 27, 2019

Resultado de imagem para bocaiuva

Authors: Heitor O.N. Altino, Bruno E.S. Costa, Renata N. da Cunha

Abstract: Macauba is a palm tree located in Tropical and Subtropical America. The oil extraction process from the pulp and kernel of the Macauba fruit generates two main residues, mesocarp and endocarp. The extraction process produces considerable quantity of residues thatcan becomeanenvironmental issue. 

The applications of mesocarp as a biosorbent have been reported, but studies involving the endocarp were no longer conducted. The objective of this paper was to study the application of endocarp, without pre-treatment, for Ni(II) biosorption optimization in fixed-bed column employing a factorial experiment. Spectroscopic studies reveled that Ni(II) biosorption can be related to functional hydroxyls and phenols groups on the biosorbent surface. Large particles with the surface covered of irregular walls, without defined pores, were observed by micrographs. The biosorption optimization showed that the usable capacity of the bed up to the break-point (tu), total time equivalent to the packaging capacity of the column (tt) and total removal (rt) were affected by both pH and Ni(II) concentration. Mass Transfer Zone (tz) was affected only by biosorption mass. 

Equilibrium metal uptake (rt) was affected by pH, biosorption mass and Ni(II) concentration. Thus, it was possible to determine the equations that control the response variables and observe asignificant and rapid removal of Ni(II). Kinetics studies exhibited the appropriateness of Pseudo-second-order model to describe the phenomena involved on biosorption kinetics. The results obtained in this paper showed the applicability of Macauba endocarp as a low-cost and environmentally friendly biosorbent fortreatment of wastewaters contaminated with Ni(II).

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