Document Detail

Influence of the drying conditions of Sargassum sp. alga on the bioadsorption of hexavalent chromium.
MedLine Citation:
PMID:  17067124     Owner:  NLM     Status:  MEDLINE    
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 São Sebastião, São 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.
S C S Rocha; J de Assis Cavalcante; M G C da Silva; C Gonçalves Pinho
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental technology     Volume:  27     ISSN:  0959-3330     ISO Abbreviation:  Environ Technol     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-10-27     Completed Date:  2007-01-11     Revised Date:  2007-03-21    
Medline Journal Info:
Nlm Unique ID:  9884939     Medline TA:  Environ Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  979-90     Citation Subset:  IM    
School of Chemical Engineering, State University of Campinas, Campinas, Sao Paulo, Brazil.
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MeSH Terms
Chromium / pharmacokinetics*
Desiccation / instrumentation*,  methods*
Microscopy, Electron, Scanning
Sargassum / chemistry,  metabolism*,  ultrastructure
Water Pollutants, Chemical / pharmacokinetics*
Reg. No./Substance:
0/Water Pollutants, Chemical; 18540-29-9/chromium hexavalent ion; 7440-47-3/Chromium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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