Abstract

SOUSA, Lailson de; VILLA-VELEZ, Harvey Alexander  and  COELHO, Paulo Henrique da Silva Leite. Kinetics of diesel adsorption by fiber in coconut nature bioadsorbents (cocus nucifera). Rev. ion [online]. 2022, vol.35, n.1, pp.117-131.  Epub Nov 01, 2022. ISSN 0120-100X.  https://doi.org/10.18273/revion.v35n1-2022008.

Lignocellulosic bioadsorbents are commonly used in adsorption processes due to their characteristics of being environmentally friendly and economically profitable. In this work, an experimental design of 23 with a central point was applied to evaluated the efficiency of coconut mesocarp fibers (Cocus nucifera L.) as bioadsorbent for diesel. Thus, this research aims to determine the effect of the coconut mesocarp in the bioabsorption of diesel as a function of the concentration of fibers, granulometry and time of exposition. Kinetics results were fitted using the models of pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elovich. The highest sorption was observed for 125-250 µm granulometry, 45 min and 200 mg of fiber, which reached of 0.67 g of oil per gram of fiber. With this efficiency, for average contamination levels, 1 kg of fibers can be used to treat up to 10 m3 of effluent. A model of pseudo-second presents the best fitted results. The activation energy was 210.13 J/mol with an Arrhenius constant equivalent to 60.47, revealing that the adsorption occurred by physisorption, through the surface diffusion of the adsorbate on the adsorbent.

Keywords : Adsorption; Bioadsorbent; Kinetics; Diesel; Coconut fiber.

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