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Type: Artigo de periódico
Title: Influence of the drying conditions of Sargassum sp alga on the bioadsorption of hexavalent chromium
Author: Rocha, SCS
Cavalcante, JD
da Silva, MGC
Pinho, CG
Abstract: Industrial wastes containing synthetic organic compounds and heavy metals are among the most dangerous residues, whose growth has followed the increase in industrial activity. Heavy metals are readily assimilated into the food chain and therefore easily accumulated in the ecosystem. To remove heavy metals from aqueous solutions, marine algae may be used as adsorbents either in their natural form or after treatments by a cross-linking process to improve their mechanical resistance. Drying of biosorbents, such as marine algae, is mentioned in many previous works as a step preceding the adsorption/dessorption cycle. Concerning algae, drying of its fresh biomass allows for proper storage and enhances performance in the sorption of heavy metals. In this work, physical and morphological analyses of fresh and dried Sargassum sp. marine algae, harvested offshore Sao Sebastiao, Sao Paulo state, Brazil, were performed in order to assess the influence of drying conditions on the biosorption process. Chromium concentrations were also determined in different parts of the algal structure before and after the biosorption process. The drying promoted structural changes in the algae, like shrinkage and porosity reduction. It was also observed that the chromium retention was dependent on the structural arrangement of the alga parts, in which the leaf was the major biosorbent.
Subject: biosorption
biosorption by algae
alga drying
Country: Inglaterra
Editor: Selper Ltd, Publications Div
Rights: fechado
Identifier DOI: 10.1080/09593332708618714
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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