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Mechanism of Cadmium Binding on the Cell Wall of an Acidophilic Bacterium

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Title Mechanism of Cadmium Binding on the Cell Wall of an Acidophilic Bacterium
 
Creator Chakravarty, Rajdeep
Banerjee, Pataki C
 
Subject Drug Development/Diagnostics & Biotechnology
 
Description Under certain conditions bacteria can act as a good biosorbent for different toxic heavy metals. However,
no study on this aspect has been reported in case of acidophilic, heterotrophic, Gram-negative Acidiphilium
strains, which are mostly resistant to several heavy metals. FTIR, SEM, TEM along with sorption
experiments using bacterial cells of Acidiphilium symbioticum H8 were conducted to establish the mechanism
of Cd2+ ion sorption. The anionic functional groups present in the cell envelop were the components
primarily responsible for the metal-binding capability of the bacterium. Sorption experiment
further confirmed that 248.62 mg of cadmium was adsorbed per gram biomass at pH 6.0. The process
can better be explained by Langmuir–Freundlich dual isotherm model. Blocking of the functional groups
by chemical modification suggested that the binding of cadmium on the biomass occurs through electrostatic
reaction and complex formation. Accumulation of cadmium on the cell envelop was supported by
fine structure study.
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://www.eprints.iicb.res.in/1419/1/pcbanerjee.pdf
Chakravarty, Rajdeep and Banerjee, Pataki C (2012) Mechanism of Cadmium Binding on the Cell Wall of an Acidophilic Bacterium. Bioresource Technology, 108. pp. 176-183.
 
Relation http://dx.doi.org/10.1016/j.biortech.2011.12.100
http://www.eprints.iicb.res.in/1419/