Selectivity silica gel with covalently linked thiosemicarbazide relative to the mixture Cu (II), Co (II), Cd (II), Ni (II), Zn (II)

Abstract

Object of study were a multi-component system – mixture Cu(II), Co(II), Cd(II), Ni(II), Zn(II) and
thiosemicarbazide covalently linked to silica gel. The selectivity of the modified material relative to Cu(II),
Co(II), Cd(II), Ni(II), Zn(II) with an excess of functional groups were investigated. The possibility of using
the equations of kinetic models of pseudo-second-order kinetic dependence for describing the sorption of
metal ions. It was shown that the competitive sorption is realized on the resulting complexing material as a
non-additive process, even under conditions of excess functional groups.
The solid phase extraction of Cu(II), Zn(II), Co(II), Cd(II) and Ni(II) on silica gel with covalently
immobilized thiosemicarbazide in a competitive sorption were investigated. The possibility of using the kinetic
equation the pseudo-second-order to assess the relative influence in the competitive adsorption. It was
found that sorption from multicomponent solutions is carried out as a non-additive process under conditions
of excess functional groups