Abstract: | The physicochemical properties of polymeric complexing sorbents with the o,o′-dihydroxy-(1-azo-1′)-functional complexing group were studied. Optimal sorption parameters for chromium(III) and manganese(II)
(medium acidity, temperature, time), the sorption capacity of the sorbents, and the stability constants (pK
a′)of the complexes were determined. Correlation relations were established between the dissociation constants (pK
a′) of the sorbent functional group and pH50 of the complexation of the considered elements; between and the stability of the formed complexes (logβ); and between pK
a′ and the deprotonation energy (E
depr) of the sorbent hydroxy group located in the para-position to the introduced substituent. The established correlation relations are useful for targeted prediction of the physicochemical
parameters of the sorbents, their complexes, and the sorption of manganese(II) and chromium(III) aimed at recovery and pre-concentration
of these ions from objects with various chemical composition. |