Biosorption of nickel using filamentous fungi

Abstract

Nickel (Ni) uptake capability from aqueous solutions was studied in a filamentous fungi strains group of Rhizopus sp., Penicillium sp. Aspergillus sp., Trichoderma sp., Byschoclamyss sp., and Mucor sp. The metal uptake of a Rhizopus sp. strain, which has the highest uptake capacity, was corroborated by electron microscopy; no Ni deposits were observed on the cell wall, but rather a homogeneous accumulation was seen on the cell surface. The influence on the capacity of metal uptake by environmental parameters such as pH, temperature, time, and the interference of other ions in the solution, was also studied. Nickel accumulation by the selected strains is fast, occurring in less than 30 min, and does not require a microorganism's active metabolism to take place. The sorption isotherms were established for the selected fungi, in order to determine the maximum metal uptake capacity. The sorption isotherms were fixed to the mathematical models of Freundlich and Langmuir, obtaining better performance on the Langmuir model.

Bioremediation of Heavy Metals in Liquid Media Through Fungi Isolated from Contaminated Sources

“…The higher uptake of heavy metal was due to less weight of fungi at a particular concentration of that heavy metal. Similar results have been reported by earlier workers [7,29].…”

“…The uptake of Ni by A. niger was most significant in comparison to all other fungi. Similar results with respect to uptake of Ni by fungi have been reported earlier [7,29].…”

Copper Adsorption by Free and Immobilized on Polyurethane Foam Cells ofAspergillus niger

“…These results show that Cu 2 + biosorption by Aspergillus niger biomass is a chemical equilibrated and saturable procces. Adsorption capacity values are concordant with those reported by other authors (6,7,11 the metal from the solutions (Fig. 4).…”

“…The linear model, which described the biosorption of solute by sorbent as directly proportional to the solution concentration is: qe = Ko .Ce (1). The Langmuir model represents one of the first theoretical treatments of non linear sorption, and has been successfully applied to a wide range of systems (1, 6,17). The model assumes uniform energies of adsorption outo the surface and no transrrrigration of adsorbate in the plane of the surface.…”

Copper Uptake by Penicillium brevicompactum

“…There are many reports concerning the bio sorption of heavy metals by the passive metal up take of different forms dead biomass (Kappor and Viraraghavan, 1997;Sag et al, 1998;Sad et al, 2000). However, there are few reports concerning the incorporation of heavy metals in living cells of filamentous fungi (Sanna et al, 1997;Mogollon et al, 1998).…”