Adsorption of methylene blue from aqueous solution on zeolitic material and the improvement as toxicity removal to living organisms
Orbital: The Electronic Journal of Chemistry
Adsorption of methylene blue from aqueous solution on zeolitic material and the improvement as toxicity removal to living organisms
Autor Correspondente: Denise A. Fungaro | [email protected]
Palavras-chave: methylene blue, zeolite, dye adsorption, acute toxicity, d. similis, v. fischeri
Resumos Cadastrados
Resumo Inglês:
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.
