Isotherms, kinetics, and thermodynamic studies for adsorption of pigments and oxidation products in oil bleaching from catfish waste

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Abstract
The aim of this work was to study the bleaching of oil extracted from the heads of the catfish by thermomechanical process through equilibrium, kinetics, and thermodynamics adsorption studies. The condition for the bleaching step was with 1% (w/w) adsorbent composed of 95% activated earth and 5% activated carbon (w/w). The pseudo-first order and pseudo-second order models were the most appropriate to represent the adsorption kinetics. The temperature of 80 °C increased the adsorption capacity of the two adsorbates, and the activation energies values were of 47.47 and 44.82 kJ mol−1, respectively, for the adsorption of carotenoids and peroxides. The Langmuir model was the most appropriate to describe the bleaching equilibrium curves. The thermodynamic parameters revealed that the processes were endothermic, favorable, and spontaneous and the interaction between adsorbent and adsorbate was physical.
Funding Information
  • Brazilian Agency for Improvement of Graduate Personnel
  • National Council of Science and Technological Development

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