Abstract
The exchange of Co2+ ions on Na-vermiculite has been comprehensively studied by the ionexchange, adsorption, and X-ray diffraction methods. It has been shown that vermiculite is distinguished by high selectivity to Co2+ cations and Kielland dependence log \(\tilde K_m (\theta )\) increasing with filling of ion-exchange sites with sorbed cations rather than a decreasing one that is observed for common systems. It has been established that the ion exchange is accompanied by segregation of Na+ and Co2+ cations in separate interlayer gaps of vermiculite with the final formation of a disordered layered “cake” composed of separate silicate layers and interlayer gaps enriched with Na+ and Co2+ ions.
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Original Russian Text © Yu.I. Tarasevich, D.A. Krysenko, Z.G. Ivanova, V.E. Polyakov, 2013, published in Kolloidnyi Zhurnal, 2013, Vol. 75, No. 3, pp. 379–384.
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Tarasevich, Y.I., Krysenko, D.A., Ivanova, Z.G. et al. Comprehensive ion-exchange and adsorption study of the distribution of exchanging inorganic cations over the interlayer gaps of vermiculite. Colloid J 75, 345–350 (2013). https://doi.org/10.1134/S1061933X13030162
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DOI: https://doi.org/10.1134/S1061933X13030162