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Synthesis and properties of phosphate cation-exchangers based on silica

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Abstract

Methods of preparation of silicas with chemically grafted molecules of aryl- and alkylphosphonic acids in the amount of 0.7–1.2 molecules/nm2 (sorbentes I and II) are described. The spectra of the sorbents in the near and fundamental IR regions were obtained. The protolytic properties of attached phosphonic acids with a different ionic strength of the solution were studied. The value of \({\text{pK}}_{{\text{a}}_{\text{1}} }\) for grafted arylphosphonic acid (1.9) coincides with \({\text{pK}}_{{\text{a}}_{\text{1}} }\) = 1.83 for p-tolylphosphonic acid in aqueous solution. Sorption of iron(III) and thorium(IV) ions on these sorbents was studied. A high degree of extraction of thorium (>90% for sorbent I and >60% for sorbent II) is observed up to 4 M HCl. Iron(III) is sorbed in less acid media. A method of concentration of thorium(IV) from dilute solutions with a concentration coefficient of 102 and a method of separating thorium(IV) from 1000-fold amounts of iron(III) are proposed.

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Authors and Affiliations

  1. Moscow State University, USSR

    G. V. Kudryavtsev, D. V. Mil'chenko, S. Z. Bernadyuk, T. E. Vertinskaya & G. V. Lisichkin

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  1. G. V. Kudryavtsev
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  2. D. V. Mil'chenko
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  3. S. Z. Bernadyuk
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  4. T. E. Vertinskaya
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  5. G. V. Lisichkin
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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 23, No. 6, pp. 711–716, November–December, 1987.

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Kudryavtsev, G.V., Mil'chenko, D.V., Bernadyuk, S.Z. et al. Synthesis and properties of phosphate cation-exchangers based on silica. Theor Exp Chem 23, 658–663 (1988). https://doi.org/10.1007/BF00534608

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  • DOI: https://doi.org/10.1007/BF00534608

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