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Synthesis and properties of phosphate cation-exchangers based on silica

Journal Article · · Theor. Exp. Chem. (Engl. Transl.); (United States)
DOI:https://doi.org/10.1007/BF00534608· OSTI ID:6330232
Methods of preparation of silicas with chemically grafted molecules of aryl- and alkylphosphonic acids in the amount of 0.7-1.2 molecules/nm/sup 2/ (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 pK/sub a1/ for grafted arylphosphonic acid (1.9) coincides with pK/sub a/sub 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 10/sup 2/ and a method of separating thorium(IV) from 1000-fold amounts of iron(III) are proposed.
Research Organization:
Moscow State Univ. (USSR)
OSTI ID:
6330232
Journal Information:
Theor. Exp. Chem. (Engl. Transl.); (United States), Journal Name: Theor. Exp. Chem. (Engl. Transl.); (United States) Vol. 23:6; ISSN TEXCA
Country of Publication:
United States
Language:
English