Removal of Dye Toxicity from an Aqueous Solution Using an Industrial Strain of Saccharomyces Cerevisiae (Meyen)

Abstract

The use of synthetic dyes is commonplace in many industries, and the effluent is often dumped into the environment with no prior treatment. The aim of the present study was to analyze the use of an industrial strain of Saccharomyces cerevisiae (Meyen) for the removal of the textile dye Acid Blue 161 from an aqueous solution. Kinetic, isotherm, and thermodynamic models were created to evaluate the biosorption mechanisms. Fourier transfer infrared (FT-IR) spectroscopy was used to characterize and identify possible binding sites. A toxicity test was also performed using Artemia salina to analyze the degree of toxicity of the dye following treatment. The kinetic results demonstrated the occurrence of intraparticle diffusion in the yeast cells as the controlling mechanism of the sorption process. Biosorption followed the Langmuir model, except at pH 8.50, when it fit the Freundlich model. The thermodynamic results demonstrate that the biosorption process is spontaneous and endothermic. The FT-IR analyses confirmed the occurrence of a chemical reaction in acid pH, but physical adsorption only occurred at pH 8.50. The toxicity test showed that the use of the yeast biomass led to the complete removal of toxicity from the dye solution, demonstrating the effectiveness of the biosorption process in the treatment of effluents contaminated with these compounds.

Saccharomyces cerevisiaeimmobilized onto cross-linked chitosan beads: application of a novel material for the removal of dye toxicity

“…Although this respects the Langmuir model as having specific dye-binding sites, it is natural for this phenomenon to occur in yeast cells due to the heterogeneity of the cell wall. Therefore, entropy values tend to be positive in the S. cerevisiae biomass [39]. These results also indicate that the association of the adsorbate at the solid-liquid interface becomes more random for all adsorbents [38].…”

“…Since the Gibbs free energy measures the maximum work for a reaction process, we were able to indicate whether a reaction occurs naturally with a significant release of energy if its value is negative, hence favouring the reaction towards the products formed. Depending on the adsorbent and the adsorbate, the Gibbs free energy values may be positive, and may also present spontaneity reaction besides a strong chemical interaction [39]. However, this positive value indicates a reactive favouring for the reagents, revealing that it is easier to separate this adsorbate from the adsorbent.…”

An approach to textile dye removal using sawdust from Aspidosperma polyneuron

“…But the qm values of sawdust in natura demonstrate greater adsorption capacity in comparison to the sawdust submitted to acid treatment. Although the results of these two treatments do not fit the Freundlich model, the nf values indicate lateral interactions with the dye, which likely occurred because of physical adsorption by van der Waals forces [26].…”

“…Sawdust in natura also exhibits a satisfactory result, since 21 mg leads to complete dye removal. One of the advantages of adsorption is the total removal of dye molecule, removing the coloration and toxicity of the solution [26].…”

Degradação Em Reator Mecanicamente Agitado De Efluente De Azul De Metileno Utilizando Persulfato De Sódio Ativado Por Hidróxido De Ferro Suportado Em Diatomita

“…Na indústria têxtil, devido a ineficiência do processo de tingimento, 200.000 toneladas são perdidas anualmente, ao fim do processo, o equivalente a aproximadamente 30% da produção, CHEQUER et al, (2013). O efluente gerado por esse tipo de indústria apresenta elevada carga de compostos químicos orgânicos, dando a este uma característica de difícil degradação e elevada toxicidade, DILARRI et al, (2016). Os corantes, mesmo em menor concentração que outros compostos, geram uma acentuada coloração.…”