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Biosorptive removal and recovery of cobalt from aqueous systems

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Title Biosorptive removal and recovery of cobalt from aqueous systems
 
Creator SUHASINI, IP
SRIRAM, G
ASOLEKAR, SR
SURESHKUMAR, GK
 
Subject mass-transfer
heavy-metals
biomass
mechanism
biosorption
cobalt
edax
epr
desorption
 
Description Equilibrium and kinetic aspects of cobalt biosorption onto a new biosorbent, PFB1, were studied. The biosorbent, PFB1, had a specific surface area of 256.8m(2)g(-1) and showed high equilibrium capacities for cobalt uptake, the highest being 190 mg g(-1) in the range of concentrations employed. The equilibrium uptake increased and then decreased with initial pH with the highest uptake at pH 7. The equilibrium uptake also decreased with increasing temperature in the range 30-45 degrees C. The kinetics of cobalt uptake were analysed using mathematical models and the external mass transfer coefficient for cobalt biosorption on PFB1 was 0.075 m s(-1). EDAX and EPR studies indicated involvement of an ion-exchange mechanism and free-radical interaction in the biosorption process. Desorption/readsorption studies for three adsorption-desorption cycles were carried out with acidic, basic and salt desorbents and the highest desorption efficiencies of 92.5% and 70.5% at the end of the first and third cycles, respectively, were obtained with 0.1 N HCl as the desorbent. (C) 1999 . .
 
Publisher ELSEVIER SCI LTD
 
Date 2011-07-21T22:05:17Z
2011-12-26T12:52:11Z
2011-12-27T05:39:14Z
2011-07-21T22:05:17Z
2011-12-26T12:52:11Z
2011-12-27T05:39:14Z
1999
 
Type Article
 
Identifier PROCESS BIOCHEMISTRY, 34(3), 239-247
0032-9592
http://dx.doi.org/10.1016/S0032-9592(98)00090-9
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6008
http://hdl.handle.net/10054/6008
 
Language en