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|Título:||Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus|
|Autor:||Monteiro, Cristina M.|
Castro, Paula M. L.
Malcata, F. Xavier
Heavy metal removal
|Citação:||MONTEIRO, Cristina M.; CASTRO, Paula M. L.; MALCATA, F. Xavier - Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus. Environmental Chemistry Letters. ISSN 1610-3653. Vol.9 (2011), p.169–176|
|Resumo:||Aquatic environments are often exposed to toxic heavy metals, which gain access to the food chain via microalgae and may cause severe problems at higher trophic levels. However, such a metabolic specificity can be taken advantage of in bioremediation strategies. The potential of a novel wild strain of Scenedesmus obliquus, previously isolated from a heavy metal-contaminated site in northern Portugal, to remove Zn from aqueous solutions was thus studied, using several initial concentrations. The removal extent reached its maximum by 1 day: 836.5 mg Zn/g biomass, at the initial concentration of 75 mg/L, mainly by adsorption onto the cell surface. Comparative studies encompassing a commercially available strain of the same microalgal species led to a maximum removal extent of only 429.6 mg Zn/g biomass, under identical conditions. Heat-inactivated cells permitted a maximum removal of 209.6 mg Zn/g biomass, at an initial concentration of 50 mg Zn/L. The maximum adsorption capacity of Zn, estimated via Langmuir’s isotherm, was 330 mg Zn/g biomass. Finally, Zn removal was highest at pH 6.0–7.0. It was proven, for the first time, that such a wild microalga can uptake and adsorb Zn very efficiently, which unfolds a particularly good potential for bioremediation. Its performance is far better than similar (reference) species, especially near neutrality, and even following heat-treatment|
|Versão do Editor:||The original publication is available at: http://www.springerlink.com/content/1610-3653/9/2/|
|Aparece nas colecções:||CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review|
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|2011_EnvironChemLetter_Vol9_pp169.pdf||405,12 kB||Adobe PDF||Ver/Abrir|
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