Abstract
The equilibrium condition and kinetics of the sorption of Cu2+, Zn2+, Cd2+ and Pb2+ ions with Amberlite IRC 748 (with iminodiacetic group, Na+), Duolite C 467 (with amino-fosfon group, Na+), Dowex MAC-3 (with carboxyl group, H+) and Amberlite IR 120 (with sulpho-group, H+) cationites have been studied and thermodynamic parameters of the processes have been calculated on the basis of data gained from the equilibrium and kinetic studies. Sorption isotherms have been organized and relevant equations have been suggested. It has been defined that the kinetics of the processes in the selected concentrations under the control of the internal diffusion. Kinetic parameters have been calculated and it has been noted that heat release and entropy reduction are managed with enthalpy factor.
Highlights
The mechanism of combining the sorbent metal ions with the functional groups of sorbents depends on the nature of the communication, the acidity of the solution, the ratio of the ion sorbed with functional group, position character of the functional groups
Since the formation of complexes with investigated ionites in neutral and weak alkaline solutions was realized between the metal cations and the Natom of the ion exchanger and between the metal cations and oxygen atoms of phosphonic groups of sorbent in the acid solutions, experiments with Amberlite IRC 748 was practiced in the interval of 7.5-7.75 of pH and Dowex MAC 3, Duolite C 467 and Amberlite IR 120 in the interval of 4.5-5.5. pH of solutions were measured by the pH meter OR-204/1
Cu2+, Zn2+, Cd2+ and Pb2+ Sorption in Sorbents with Different Functional Groups the above sequence, their matrices are in the form of macroreticular, macroporous, macroporous and gel, their swelling rates are 3,52; 3,50; 2,84 and 2,316
Summary
The mechanism of combining the sorbent metal ions with the functional groups of sorbents depends on the nature of the communication, the acidity of the solution, the ratio of the ion sorbed with functional group, position character of the functional groups. There is enough information on clarifying the equilibrium conditions, the kinetic properties, the calculating the thermodynamic parameters of the sorption of ferrous metal ions with the sorbents of various natures and functional groups. In these studies, the selection of sorption, the factors affecting to the selectivity, the nature of the environment, the analysis of sorption isotherms, suggesting the calculation equations of isotherms, the regeneration regimes of the done ionites were thoroughly investigated [1,2,3,4,5,6]
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