Evaluating Aspergillus brasiliensis (ATCC 16404) for the bioaccumulation and solubilization of selenium nanoparticles

Résumé

Abstract The extensive application of selenium nanoparticles (Se-NPs) in research and industry for their antibacterial, antioxidant, and anticancer properties raises concerns about environmental contamination and ecological risks. This highlights the need for eco-friendly methods to remove its pollutants. This study evaluates the potential of A. brasiliensis for the solubilization and removal of myco-synthesized Se-NPs from aqueous solutions. Se-NPs were biosynthesized using Fusarium oxysporum and characterized by UV-Vis, FTIR, and TEM analyses. The effects of biomass weight, contact time, pH, and initial Se-NPs concentration were assessed to determine the optimal biosorption conditions. Biosorption parameters were optimized, achieving a 54% removal efficiency at an initial Se-NPs concentration of 100 ppm (pH 7, 30 min). Furthermore, during biomass dosage optimization, the process reached a maximum removal efficiency of 61.6% at an initial concentration of 160 ppm. A. brasiliensis displayed a strong solubilization capability (55.53%), evidenced by the formation of clear halo zones on agar plates compared to the control. Among the tested biomass forms, dried (dead), A. brasiliensis , exhibited the greatest removal efficiency, reaching 92.93%. Se-NPs were adsorbed onto the surface of fungal mycelium (SEM and EDX analyses) and/or accumulated into mycelium. These findings highlight the potential of A. brasiliensis as an effective and environmentally friendly biosorbent for mitigating Se-NPs contamination in aqueous environments.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0