Analysis of the Dynamics of Multicomponent Sorption of Salts of Metals on Weakly Basic Anionites within the Framework of the Surface Complexation Theory

摘要

The dynamics of the ion-exchange sorption of heavy metals from multicomponenl mixtures on weakly dissociating ionites is modeled. The simulation is based on the numerical solution of a system of nonlinear dynamic equations of material balance and kinetic equations of internal di ffusion for the sorption of multicomponent mixtures. Multicomponent equilibria on weakly dissociating ionites are described within the framework of the theory of the formation of surface complexes (the SCT model). This model is extended to computer simulations of the dynamics of the sorption of metal ions via the coordination bonding mechanism based on the properties of amino groups as weakly dissociating Lewis bases. A model of the dynamics of sorption of the metals (Me_A~(2+), Me_B~(2+)) from the H~+/Me_A~(2+)/Me_B~(2+)/An~- system (An~- = Cl~- and SO_4~(2-)) on Fuji PEI-CS-07 and Purolite A-109 weakly basic anionites containing amino groups is developed with consideration given to the Lewis-base properties of these anionites. Calculated frontal displacement chromatograms for the dynamic ion-exchange separation of various multicomponent systems containing heavy metals are compared.