Abstract
The aqai palm stalk (Euterpe oleracea) is food residue used in its natural form (AS) as biosorbent for the removal of Evans Blue (EB) and Vilmafix Red RR-2B (VR) textile dyes from aqueous solutions. The effects of pH, biosorbent dosage, and shaking time on biosorption capacities were studied. The maximum adsorption of both dyes occurred at pH 2.0. The Avrami fractional-order kinetic model provided the best fit to experimental data compared with pseudo-first-order and pseudo-second-order kinetic adsorption models. The equilibrium data were fitted to Langmuir, Freundlich, and Sips isotherm models. For both dyes, the equilibrium data were best fitted to the Sips isotherm model. Simulated dyehouse effluents were used to check the applicability of the proposed AS biosorbent for effluent treatment.
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