Abstract
Silver removal from industrial waste waters by biosorbents is more profitable as compared with traditional sorbents such as ion-exchange resins or activated carbon. Silver biosorption by the filamentous fungi Penicillium glabrum, Fusarium nivale, and Fusarium oxysporum isolated from activated sludge was studied. These cultures formed granules which had tolerance to silver of high doses that allowed accumulating silver effectively. Through the selection of the optimal growth phase of the microorganisms, pH value, temperature, and chemical composition of the medium, it was possible to obtain the silver biosorbents having the adsorption capacity attaining nearly 988 mg/g. The process was best described with Langmuir isotherm; the kinetics of biosorption of silver by fungal granules obeyed the pseudo-second-order model.
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