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  • Title: Study of the mechanisms of Cu2+ biosorption by ethanol/caustic-pretreated baker's yeast biomass.
    Author: Zhang Y, Liu W, Xu M, Zheng F, Zhao M.
    Journal: J Hazard Mater; 2010 Jun 15; 178(1-3):1085-93. PubMed ID: 20226588.
    Abstract:
    Baker's yeast biomass was pretreated by ethanol and caustic soda, and then the pristine baker's yeast, ethanol pretreated baker's yeast (ethanol-baker's yeast) and caustic soda pretreated baker's yeast (caustic-baker's yeast) were utilized as biosorbents to adsorb Cu(2+) in aqueous solution. The influence of different parameters on Cu(2+) uptake by the three biomasses, such as initial Cu(2+) concentration, initial pH of solution, contact time and temperature, was studied. The mechanism of Cu(2+) binding by biomass was investigated by a number of techniques. Evidence from potentiometric titration revealed that the concentration of carboxyl and amino groups is higher on the caustic and ethanol-baker's yeast compared to the pristine baker's yeast and FTIR spectra confirmed carboxyl, and amino groups on the surface of baker's yeast could be available for characteristic coordination bonding with Cu(2+). In addition, SEM and Zeta potential of the three samples show that caustic and ethanol-pretreatment resulted in the change of baker's yeast surface structure and charge which is relative to adsorption. These results demonstrate that the increase of biosorption capacity for Cu(2+) by ethanol and caustic-baker's yeast was attributed to the increase and exposure of carboxyl and amino groups on the surface of biomass sample.
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