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Biosorption of free and complexed cadmium ions by Aspergillus niger

1999; Elsevier BV; Linguagem: Inglês

10.1016/s1572-4409(99)80140-0

2212-084X

Luiz Henrique Rosa, P.F. Pimentel, M. M. Figueira, Lêda C. Mendonça-Hagler, Newton C. M. Gomes,

Chromium effects and bioremediation

Metal ion adsorption by microorganisms is commonly denoted as biosorption and does not depend on cellular metabolic activity. In this work the biomass of the fungus Aspergillus niger was tested for the capacity to accumulate cadmium in the presence and absence of an organic ligand (citrate). An overall improvement on the Cd sorption capacity of at least 15% was achieved with caustic treatment. The present work elucidates, to some extent, the effects of caustic treatment on the biosorption of Cd by A. niger in terms of improvement of the metal uptake as well as some changes in the biomass sites due to both the treatment and the presence of the metal.