Adsorption study of the charge distribution features of highly charged smectites
Abstract
The study examines the results of assessing the charge density distribution of smectite layers from the bentonite province of the Republic. Kazakhstan (Taganskoye and Dinosaurovoye fields) by alkylammonium method. The method is based on the study of the interaction of a homologous series of fatty amines with the surface of smectites. Organic cations form monomolecular and bimolecular adsorption layers on the basal surfaces. This allows the analysis of the dependence of the position of the diffraction maximum in the small-angle region on the bounding area of the organic cation and to obtain the charge density distribution over the smectite layers. The results obtained for the studied samples show a similar composition of montmorillonite: in all cases, smectites were characterized by a significant charge density with a different proportion of highly charged layers (cation exchange capacity – 120-130 mEq/100 g). The obtained data on charge distribution were compared with some adsorption and colloid-chemical characteristics of smectites, including the values of their cation exchange capacities. At the same time, such technological parameters as the effective viscosity of aqueous dispersions, despite the close charge distribution, differed significantly and showed a sharp dependence on the proportion of sodium cations in the exchange complex.
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References
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