RESUMO
Dyeing wastewater is very hard to treat, and adsorption could be a good choice. Spent substrate of Pleurotus eryngii (SSPE) was first used to adsorb malachite green, safranine T and methylene blue from aqueous solutions, and the corresponding adsorption isotherm, thermodynamics and dynamics models were simulated. More than 93% of the dyes were removed with solutions with 100 mg/L of initial dye concentration, 1 g of SSPE and pH of 6.0 after adsorption for 4 h. Freundlich isotherm models fit better the adsorption data than Langmuir models. Adsorption of the dyes onto SSPE was a spontaneous exothermic process based on an adsorption thermodynamics model. SSPE could adsorb the dyes rapidly, and a second-order kinetics model fit better with the adsorption data than a pseudo first-order kinetics model. Accordingly, SSPE could be a good bio-adsorbent for the removal of malachite green, safranine T and methylene blue from the aqueous solution.
Assuntos
Corantes/isolamento & purificação , Pleurotus/metabolismo , Eliminação de Resíduos Líquidos/métodos , Poluentes Químicos da Água/isolamento & purificação , Purificação da Água/métodos , Adsorção , Produtos Biológicos/química , Produtos Biológicos/metabolismo , Corantes/química , Concentração de Íons de Hidrogênio , Modelos Químicos , Termodinâmica , Poluentes Químicos da Água/químicaRESUMO
Spent substrate of Ganodorma lucidum (SSGL), waste from cultivation of Ganoderma lucidum, was firstly used as a bio-adsorbent to adsorb three typical dyes malachite green, safranine T and methylene blue, and the adsorption thermodynamics and dynamics were also studied. SSGL was rich of hydroxyl group and carbonyl group, which had the potential to be an efficient bio-adsorbent for the three dyes removal from water and wastewater, and the treatment model should be eco-friendly. The experimental data fit well with the Langmuir and Freundlich isotherm, and the adsorption of dyes took place mainly on monolayer surface of SSGL. The experimental data fit also well with the adsorption thermodynamics, the adsorption were spontaneous and mainly a chemical adsorption. SSGL could adsorb the dyes rapidly and achieve an equilibrium in a short time, and the experimental data fit well with the second-order kinetics model.
