ISSN 0005-2531 (Print) ISSN 2522-1841 (Online)
ADSORPTIVE AND COLLOIDAL-CHEMICAL CHARACTERISTICS OF BENTONITE AND ITS MODIFIED FORMS
A.I.Yagubov, N.M.Muradova, S.A.Mammadova, U.H.Osmanova, G.M.Heyderzade

 

On the basis of experimental and theoretical researches we determined the impact of kinetic and diffusion coefficients on the change of concentration of cation active dye stuffs during their extraction by modified bentonites. Using mathematical model the values of all parameters calculated on laboratorial and industrial level were given. Samples of Na-form of nanobentonite were obtained. Na-form of nanobentonite shows very high results with regard to Zn2+  ions. Kinetic laws of the process were studied. The values of entropy and enthalpy of adsorption of zinc ions, as well as equilibrium coefficients depending on temperature were calculated. Negative values of Gibbs¢ free energy ΔG0 show that on bentonite samples the process of thermodynamic adsorption is possible. As well high value of  ΔG0  with the increase in temperature shows that at high temperatures adsorption is possible.

 

Keywords : sorption, nanobentonite, cation active dye stuffs, kinetics, entropy, enthalpy, free energy, zinc ions
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THE LAST NUMBER OF THE JOURNAL
№3 2021
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