In order to obtain organic-inorganic ion-exchanger, a method has been proposed involving reorganization of n gel-like cation exchange matrix in non-aqueous media followed by zirconium hydrophosphate precipitation. Reorganization, which is confirmed with methods of standard contact porosimetry and NMR 23 Na spectroscopy, means a narrowing of transport pores of the polymer. As a result of precipitation in the reorganized matrix, aggregates of zirconium hydrophosphate nanoparticles are formed. Scanning electron microscopy has shown the size of these formations to be of 200 nm in diameter. It has been found with a method of X-ray fluorescence analysis, a molar ratio of Zr:P in the inorganic constituent is 1:0.31. The regularities of precipitation are considered from the point of view of Ostwald-Freundlich and Volfkovich equations. inorganic method with a low content of phosphorus. Small size of the incorporated particles provides high rate of removal of U(VI) cationic compounds from individual aqueous solution containing also HCl (pH 2.5). The regime of sorption is mixed-diffusion, the coefficients of U(VI) → H + exchange for particle diffusion are 5.45∙10 –12 (composite), 3.86∙10 –12 (unmodified resin), 4.75∙10 –14 (individual zirconium hydrophosphate) m 2 s –1 . In the case of sorption from the solution containing also Fe(III), U(VI) sorption is complicated with a chemical reaction of the pseudo-second order. In opposite to unmodified resin, the composite removes U(VI) compounds in a wide range of the solution pH (2–10).

Currently, for calculations of processes in the ion-exchange columns is used the model which require the use of parameters such as diffusion coefficients of the ions in solution and the ion exchanger, exchange capacity, selectivity coefficients, and particle size of the ion exchanger and bed height, velocity of the solution. The greatest difficulty is the definition of the diffusion coefficient of exchanging ions in the ion exchanger, as this parameter varies with the degree of substitution of the resin and is very dependent on the presence of other ions in solution. In this regard, the actual task is creating a formalized process model in a dynamic mode, which allows minimizing the number of parameters, eliminating the diffusion coefficients and selectivity. The aim of research is creation of a formalized model of ion exchange, taking into account only empirical parameters.It is investigated the strongly acidic gel ion exchanger modified by aggregates of nanoparticles of zirconium hydrogen phosphate. In dynamic mode it was performed deionization of combined solution prepared in tap water, which contains ions of calcium, magnesium and nickel.Under dynamic conditions it is investigated extract of nickel ions from the combined solution by using a strongly acidic gel cation exchange resin and the composite ion exchanger on its base, containing aggregates of nanoparticles of zirconium hydrogen phosphate. A model is proposed, which allows determining the time at which the capacity is reached before breakthrough for nickel ions. This model involves the use of only empirical parameters obtained in the investigation of ion exchange in a dynamic mode, reflecting the concentration of ions in the solid phase and does not require prior identification and selectivity coefficient of diffusion of sorbed ions, and the communication mode (external and internal diffusion or mixed).

The organo-inorganic composites based on a strongly acid gel resin including zirconium hydro-phosphate nanoparticles and their aggregates were studied by impedance spectroscopy, electron microscopy, and standard contact porosimetry. The porous structure of the polymer was transformed under the action of the inorganic filler. The nanoparticles in the transport pores provided a three- to fivefold increase in the electric conductivity of the nanocomposites compared with the conductivity of the nonmodified ionite and a decrease in the percolation threshold. The nanocomposite ionites demonstrated stability against the accumulation of organic substances during electrodeionization to extract Na+ from low-concentrated solutions.

Hybrid organic-inorganic ion exchangers are obtained by incorporating amorphous zirconium hydrophosphate into the gel of strong acidic cation exchange resin. Hybrid organic-inorganic ion exchangers are obtained by modifying strong acidic cation exchange resin with amorphous zirconium hydrophosphate. The synthesized materials are studied by standard porometry contact. It is found that raising the inorganic component content to 34 wt % diminishes the microporosity of the samples and simultaneously enhances the of meso- and macropore volume. Experiments establish that modification of a polymer matrix lowers the self-diffusion coefficient of Ni2+ from 8.1 × 10−12 to 2.4 × 10−12–4.1 × 10−12 m2 s−1; nevertheless, an inorganic ion exchanger minimizes the inhibitory effect of co-ions on the Ni2+ → H+ exchange rate. One possible mechanism for of filling of the matrix by with particles of zirconium hydrophosphate is discussed.