Abstract
The paper has investigated the impact of hardness salts modeling soft and hard waters on sorption of trace amounts of Cd(II) by β-cyclodextrin-containing silicas, which differ by chemical nature of sorption centers. The paper has demonstrated high affinity of organosilicas to Cd(II) in its sorption from multicomponent solutions. Equilibrium sorption of cations from aqueous nitrate solutions within a broad interval of concentrations has been described by means of the Langmuir and Freundlich models and was interpreted in terms of the theory of hard and soft acids and Pearson bases.
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