BIOSORPTION OF CADMIUM (II) FROM AQUEOUS SOLUTION BY ALGINATE – IMMOBILIZED ASPERGILLUS FUMIGATUS BIOMASS

D. O. Jalija, A. Uzairu, M. S. Sallau, P. A. Ekwumemgbo

Abstract


The objective of this investigation was to study the biosorption of Cd (II) onto Aspergillus fumigatus immobilized in calcium alginate and to determine the isotherms and kinetics of the adsorption reaction. The parameters investigated were effect of initial solution pH, contact time and initial metal ion concentration. The results showed that the removal efficiency increased with an increase in pH. The maximum Cd (II) biosorption of 96.39 % was achieved at pH of 8.0, contact time of 120 minutes and initial Cd (II) concentration of 2 mg/L. The values of the coefficient of determination R2 for the Langmuir and Freundlich isotherms (0.9856 and 0.9548 respectively) showed that the experimental data fitted the Langmuir  better than the Freundlich isotherm. The maximum biosorption capacity Qo was 3.86 mgg-1. The kinetic plots also showed that the pseudo – second order kinetics was the rate – controlling step. These results show that the investigated biosorbent is a good low cost adsorbent for the removal of Cd (II) from wastewaters. 

Key words: Biosorption, Aspergillus fumigatus, Alginate, Isotherm, Langmuir, Freundlich


Full Text:

PDF

Refbacks

  • There are currently no refbacks.


Chemical Society of Nigeria