Effect of the Degree of Sulfoethylation of Polyaminostyrene on Its Acid-Basic Properties and Specificity of Interaction
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GANIC SYNTHESIS AND INDUSTRIAL INORGANIC CHEMISTRY
Effect of the Degree of Sulfoethylation of Polyaminostyrene on Its Acid-Basic Properties and Specificity of Interaction with Transition Metal Ions L. M. K. Alifkhanovaa,*, O. I. Merezhnikovaa, Yu. S. Petrovaa, E. O. Zemlyakovab, A. V. Pestova,b, and L. K. Neudachinaa a
Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, 620002 Russia Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620137 Russia *e-mail: [email protected]
b Postovsky
Received February 19, 2020; revised April 5, 2020; accepted July 13, 2020
Abstract—A method was developed for the preparation of N-2-sulfoethylated polyaminostyrene (SEPAS) by gel synthesis with a degree of substitution up to 1.2. The composition and structure of the products of polymeranalogous transformations were characterized using elemental analysis and FT-IR spectroscopy. It was found that an increase in the degree of sulfoethylation decreases the basicity of amino groups. This leads to an increase in the selectivity coefficient KAg(I)/Cu(II) in an ammonium acetate buffer solution in the pH range 5.5–6.0, which makes it possible to use SEPAS for the selective extraction of silver(I) from solutions of complex composition. The degree of sulfoethylation does not affect the rate at which the sorption equilibrium is established. Keywords: sulfoethylated polyaminostyrene, silver(I), copper(II), selective sorption DOI: 10.1134/S1070427220090128
The complex composition of objects in which it is necessary to control the silver content, as well as the insufficient sensitivity of methods for its determination in some cases, is required for the use of separation and concentration methods at the stage of sample preparation. Among the methods for the isolation of silver (both for the purpose of analytical determination and for the purpose of subsequent reduction), concentration with the employing complexing sorbents is promising. A large number of sorption materials were proposed for the concentration of silver(I). However, the number of sorbents that make it possible to selectively extract this ion from objects of complex composition is small. Among the materials proposed for the selective extraction of silver(I) in the last 5 years, we can distinguish sorbents based on silicon oxide [1–3]; however, such materials have low hydrolytic stability, they are stable in the pH range of 2–8. A number of magnetic composites containing various functional groups was described in [4–6]. Sorbents based on modified natural [7, 8] and synthetic [9–11] polymers are most widely used in sepa-
ration and concentration; however, the materials under consideration are characterized by low KAg/Me selectivity coefficients [8, 11] and relatively high degrees of extraction of accompanying ions metals: from 10 to 97% [5, 6, 9]. In other cases [1, 4, 7, 10], the interpretation of the data obtained by various authors is complicated by the fact that sorption is studied only from binary solut
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