Abstract
The adsorption of methylene blue (MB) from aqueous solution was carried out using zeolite. This adsorbent material was synthesized from fly ash as a low-cost adsorbent, allowing fly ash to become a recycled residue. Factors that affected adsorption were evaluated: initial dye concentration, contact time and temperature. The equilibrium of adsorption was modeled by Langmuir, Freundlich and Temkin models. The adsorption obtained data were well described by Temkin, the adsorption isotherm model. Thermodynamic calculations suggest that the adsorption of methylene blue on zeolite synthesized from fly ash is a spontaneous and exothermic reaction. Acute toxicity was determined for raw and adsorbed methylene blue solutions, as if it was a real liquid residue. Acute effects were substantially reduced after the adsorption treatment. The values of untreated solution of methylene blue were 16.58 ppm up to 18.64 ppm for Vibrio fischeri bacteria and from 0.16 ppm up to 0.43 ppm for Daphnia similis cladoreca exposed to the dye for 48 hours.
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