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Sorption of ferrous and ferric iron by extracellular polymeric substances (eps) from acidophilic bacteria.
MedLine Citation:
PMID:  23876140     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The sorption of Fe(II) and Fe(III) by extracellular polymeric substances (EPS) of acidophilic bacteria Acidiphilium 3.2Sup(5) and Acidithiobacillus ferrooxidans, harvested from the ecosystem of the Tinto River (Huelva, Spain), was investigated. EPS from mixed cultures of both bacteria (EPSmixed) and pure cultures of A. 3.2Sup(5) (EPSpure) were extracted with ethylenediamine tetraacetic acid (EDTA) and were characterized by Fourier-transform infrared (FTIR), electron photoemission (XPS), x-ray diffraction (DRX), and energy dispersive x-ray (EDX) spectroscopy and scanning electron microscopy (SEM). EPS pure were loaded, in sorption tests, with Fe(II) and Fe(III). The results obtained indicate that the biochemical composition and structure of EPSmixed was very similar to that of EPSpure. Besides, results indicate that EPSmixed adsorbed Fe(II) and Fe(III) by preferential interaction with the carboxyl group, which favored the formation of Fe(II)/Fe(III) oxalates. These species were also formed in EPSpure loaded with Fe(II)/Fe(III). All this behavior suggested that the sorption of iron by EPSmixed was similar to sorption of EPSpure, which fitted the Freundlich model. Thus, the iron uptake of EPSmixed reached 516.7 ± 23.4 mg Fe/g-EPS at an initial concentration of 2.0 g/L of Fetotal and Fe(II)/Fe(III) ratio of 1.0.
Authors:
Jaime M Tapia; Jesús Muñoz; Felisa González; Maria L Blázquez; Antonio Ballester
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Preparative biochemistry & biotechnology     Volume:  43     ISSN:  1532-2297     ISO Abbreviation:  Prep. Biochem. Biotechnol.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-07-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9607037     Medline TA:  Prep Biochem Biotechnol     Country:  England    
Other Details:
Languages:  eng     Pagination:  815-27     Citation Subset:  IM    
Affiliation:
a Faculty of Engineering and Architecture, Section of Aqueous Process in Metallurgy, University Arturo Prat , Iquique , Chile.
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