Influence of grafted β-cyclodextrin on the sorbing activity of silica gel to ions of toxic metals
DOI:
https://doi.org/10.15407/dopovidi2016.03.069Keywords:
cation, oxyanion, silica gel, sorption, β-cyclodextrinAbstract
The uptake of cations of toxic metals (cadmium, lead, and copper) and oxyanions from nitrate, phosphate, and arsenate aqueous solutions by silica chemically modified with β-cyclodextrin is studied. It is proved that the sorption process involves the simultaneous formation of surface supramolecular structures "β-cyclodextrin — oxyanion" and mixed complexes of metal cations with the side functional groups of grafted β-cyclodextrin. It is found that the adsorption of cations correlates with the electronegativity of chemical elements, and the adsorption of oxyanions — with the complementarity of their sizes to parameters of the internal cavity of the cyclic oligosaccharide.
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