Fungal biosorption of cadmium(II) onto Fennelia nivea from aqueous solution: equilibrium, thermodynamics, and kinetics


ARACAGÖK Y. D. , Ogun E., TORUN M. , Akyil H., CİHANGİR N. , Sanin S.

DESALINATION AND WATER TREATMENT, vol.222, pp.386-393, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 222
  • Publication Date: 2021
  • Doi Number: 10.5004/dwt.2021.27091
  • Title of Journal : DESALINATION AND WATER TREATMENT
  • Page Numbers: pp.386-393

Abstract

Cadmium(II) is an important ecotoxic pollutant and may cause health problems if accumulated in the human body. This study focused on the removal of cadmium(II) from aqueous solutions using newly isolated fungus dry mass as the adsorber. The fungus was isolated from soil and identified as Fenellia nivea, based on 18S rRNA sequence analysis. Cadmium(II) biosorption studies were carried out as a function of pH, biomass dose, initial metal concentration, contact time, and temperature. The pH of the aqueous solution strongly influenced the removal percent of Cd(II). The highest cadmium removal yield was obtained at pH 7 (4.9 mg/g) as well as below pH 4, very low yield biosorption of Cd(II) was observed. In the first 5 min, almost 50% Cd(II) ions were removed from the solution and reached equilibrium within 1,440 min at pH 7. Adsorption isotherm follows Langmuir model as well as the dimensionless constant is zero that corresponds to the irreversible adsorption of Cd(II) ions on biomass. The reaction rate constant for the pseudo-second-order adsorption process was found as 3.74 x 10(-3) g/mg min. The adsorption process was determined as endothermic and spontaneous with negative standard Gibbs energy change.