title: Sorption and desorption of cobalt by Oscillatoria anguistissima.
abstract: Oscillatoria anguistissima rapidly adsorbs appreciable amounts of cobalt from the aqueous solutions within 15 min of initial contact with the metal solution. O. anguistissima showed a high sequestration of cobalt at low equilibrium concentrations, and it followed the Freundlich model of adsorption. The adsorption is a strongly pH-dependent and temperature-independent phenomenon. The presence of Mg2+ and Ca2+ (100-200 ppm) resulted in decline in Co2+ adsorption capacity of Oscillatoria biomass. Sulphate and nitrate (0. 75-10 mM) drastically reduced the extent of Co2+ biosorption. The biosorption of cobalt is an ion-exchange process as the Co2+ binding was accompanied by release of a large amounts of Mg2+ ions. Na2CO3 (1.0 mM) resulted in about 76% desorption of Co2+ from the loaded biomass.
authors.affiliation: Department of Microbiology, University of Delhi, South Campus, Benito Juarez Road, New Delhi 110021, India.
authors.forename: P
authors.initials: P
authors.lastname: Ahuja
authors.forename: R
authors.initials: R
authors.lastname: Gupta
authors.forename: R K
authors.initials: RK
authors.lastname: Saxena
mesh_terms: D000327:Adsorption / Q000187:drug effects; D018533:Biomass; D002118:Calcium / Q000494:pharmacology; D002614:Chelating Agents / Q000494:pharmacology; D003035:Cobalt / Q000493:pharmacokinetics*; D000458:Cyanobacteria / Q000378:metabolism*; D003666:Decontamination / Q000379:methods*; D006851:Hydrochloric Acid / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000494:pharmacology; D009566:Nitrates / Q000494:pharmacology; D013431:Sulfates / Q000494:pharmacology; D013997:Time Factors; D018508:Water Purification / Q000379:methods
chemical_list: D002614:Chelating Agents; D009566:Nitrates; D013431:Sulfates; D003035:Cobalt; D008274:Magnesium; D006851:Hydrochloric Acid; D002118:Calcium