HIGHLIGHTS
SUMMARY
The increase in biosorption parameters with the increase in the initial concentration of metal ions shows that RWB has a sufficiently large number of functional_groups that can interact with metal ions from aqueous solution and that these functional_groups are mostly located on the surface of biosorbent, because they allow the quantitative biosorption of Pb(II) and Hg(II) even at high initial concentrations. This does not mean that the biosorption of Pb(II) and Hg(II) ions takes place in multiple layers, but rather that the metal ions are retained on a heterogeneous surface . . .
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