Abstract
We have investigated adsorption isotherms of water vapors and heat of the wetting by water of a number of saponite samples with alkali, alkaline-earth and transition 3d-cations in the exchange complex. It has been shown that in a single-layer hydrates of a mineral of thickness Δd = 2.8–3.2 Å the formation of flat di-, tri-, and tetra-aquacations of metals takes place. In two-layer hydrates doubly charged exchange cations, as a rule, are surrounded by the octahedral of water molecules. Thermal stability of interlayer hydrates are small: they are destroyed as a result of thermovacuum treatment at 140°C. A decrease of the water heat wetting of the samples with transition metal ions in the exchange complex after thermovacuum treatment at 300°C is related to the irreversible merging of a part of the saponite structural layers as a result of the formation in interlayer intervals of waterless oxides of transition metals. The paper noted the ways of using saponite as an active supplement to the coagulant for increasing the quality of natural water treatment.
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Ostapenko, V.T., Tarasevich, Yu.I., Kulishenko, A.E., and Sinel'nikov, N.A., Khimiya i Tekhnologiya Vody, 1990, vol. 12, no. 9, pp. 819–821.
Grytsyk, V.E., Osadochnye porody i rudy (Sedimentation Rocks and Ores), Kiev: Nauk. Dumka, 1984.
Tarasevich, Yu.I. and Ovcharenko, F.D., Adsorptsiya na glinistykh mineralov (Adsorption on Clayey Minerals), Kiev: Nauk.. Dumka, 1975.
Arinushkina, E.V., Rukovdstvo po khimicheskomu analizu pochv (Manual on Chemical Analysis), Moscow: Izd-vo Mosk. Un-ta, 1962.
Tarasevich, Yu.I. and Polyakov, V.E., Khimiya i Tekhnologiya Vody, 2003, vol. 25, no. 2, pp. 158–178.
Tarasevich, Yu.I., Rudenko, V.M., and Polyakov, V.E., Ukr. Khim. Zhurn., 1981, vol. 47, no. 6, pp. 603–609.
Ovcharenko, F.D., Gidrofil'nost’ glin i glinistykh mineralov (Hydrophilicity of Clays and Clayey Materials), Kiev: Izd-vo AN USSR, 1961.
Martin, T., Proc. 6th Natl. Conf. (Berkeley, USA, August 1957), New York: Pergamon Press, 1959.
Tarasevich, Yu.I., Stroenie i khimiya poverkhnosti sloistykh silikatov (Structure and Chemistry of the Surface of Layered Silicates), Kiev: Nauk. Dumka, 1988.
Kawano, M. and Tomita, K., Clays and Clay Miner., 1991, vol. 39, no. 2., pp. 174–183.
Kratkii spravochnik fiziko-khimicheskikh velichin (Short Reference Book of Physicochemical Values), Mishchenko, K.P. and Ravdel', A.A. (Eds.), Leningrad: Khimiya, 1974.
Suquer, N., Prost, R., and Pezerat, H., Clay Matter, 1977, vol. 12, no. 2, pp. 113–126.
Suquet, H., Propertes de conflement et structure de la saponite. Compairison avec la vermiculite: These de doctorat d'etat et science physiques, Paris: Univ. P. et M. Curie, 1978.
Tarasevich, Yu.I., Prirodnye sorbenty v protsessakh ochistki vody (Natural Sorbents in Water Treatment Processes), Kiev: Nauk. Dumka, 1981.
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Original Russian Text © Yu. I. Tarasevich, V.E. Polyakov, Z.G. Ivanova, M.Yu. Trifonova, 2011, published in Khimiya i Tekhnologiya Vody, 2011, Vol. 33, No. 4, pp. 381–391.
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Tarasevich, Y.I., Polyakov, V.E., Ivanova, Z.G. et al. The composition, structure and thermal stability of hydrates of exchange cations of saponite. J. Water Chem. Technol. 33, 224–229 (2011). https://doi.org/10.3103/S1063455X11040035
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DOI: https://doi.org/10.3103/S1063455X11040035