问题描述：
Silk sericin and chitosan biosorbents are low cost and highly efficient biosorbents
derived from waste biomass.Both biosorbents displayed good capacity and
excellent selectivity for gold adsorption.Silk sericin and chitosan adsorbed
respectively 1 and 3.3 mmol.g-1 of gold and have Kd values of 450 and 34,000,
respectively.Experimental evidence showed that gold adsorbed on the amide
groups of the silk sericin,while gold and copper adsorbed on the amino groups of
chitosan via charge-interactions and complexation.Binary (Au-Cu),five (Au-Co-Ni-
Cu-Zn) and six (Au-Pd-Co-Ni-Cu-Zn) separations consistently showed that silk
sericin has better selectivity (SelAu >2.4) than chitosan.It is possible to recover gold
at 99.5 % purity by silk sericin and 90 % if the solution contained palladium.
derived from waste biomass.Both biosorbents displayed good capacity and
excellent selectivity for gold adsorption.Silk sericin and chitosan adsorbed
respectively 1 and 3.3 mmol.g-1 of gold and have Kd values of 450 and 34,000,
respectively.Experimental evidence showed that gold adsorbed on the amide
groups of the silk sericin,while gold and copper adsorbed on the amino groups of
chitosan via charge-interactions and complexation.Binary (Au-Cu),five (Au-Co-Ni-
Cu-Zn) and six (Au-Pd-Co-Ni-Cu-Zn) separations consistently showed that silk
sericin has better selectivity (SelAu >2.4) than chitosan.It is possible to recover gold
at 99.5 % purity by silk sericin and 90 % if the solution contained palladium.
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