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Electronic Journal of Biotechnology

versão On-line ISSN 0717-3458


DA COSTA, Antonio Carlos Augusto; MORA TAVARES, Ana Paula  e  PESSOA DE FRANCA, Francisca. The release of light metals from a brown seaweed (Sargassum sp.) during zinc biosorption in a continuous system. Electron. J. Biotechnol. [online]. 2001, vol.4, n.3, pp.3-4. ISSN 0717-3458.

The biosorption of zinc and calcium was investigated with a biomass of Sargassum sp., a brown seaweed, in a continuous system consisting of three serial tubular fixed-bed laboratory reactors. Results indicated that zinc was efficiently recovered by the biomass. After treatment of 9.0 liters of a mixed solution containing 130.0 mg/l zinc and 260.0 mg/l calcium, the first column of the system saturated with zinc; the remaining columns did not saturate with zinc as a result of the pre treatment performed by the first reactor. Calcium was also efficiently biosorbed by the biomass, saturating the system much faster than zinc. X-ray fluorescence spectrum indicated the presence of various elements in the structure of the Sargassum sp. biomass, especially alkaline and alkaline-earth elements. Alkaline and alkaline earth elements played a key role in the biosorption of zinc, being responsible for ion-exchange reactions performed during zinc biosorption.

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