The study of ion exchange kinetics on the anionite in weak electric fields
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2023-04-12 15:23
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KOSHELI, Nicolai, SMYRNOVA, O., KOSTYRYA, M.. The study of ion exchange kinetics on the anionite in weak electric fields. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 340. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

The study of ion exchange kinetics on the anionite in weak electric fields


Pag. 340-340

Kosheli Nicolai1, Smyrnova O.1, Kostyrya M.2
 
1 Ukrainian State University of Chemical Technology,
2 Institute of Transport Systems and Technologies NAS of Ukraine
 
Disponibil în IBN: 6 august 2019


Rezumat

Ion exchange is one of the most widespread techniques of commercial water purification. The process mechanism consists in the ion exchange between the solid-phase material and dissolved impurities of salts in water. For example, when water is run through the anionite, containing NaCl, Cl- anions are sorbed from the solution, and hydroxyl ions go into the solution: R-OH+Cl->R-Cl+OH (1) After saturation with Cl- ions, an anionite is regenerated with concentrated NaOH solution, and it recovers in the working OH - form. Similar processes take place in cationites, which exchange salt cations for hydrogen ions. The rate of the exchange process depends on several factors. Ionic diffusion stage gives the largest contribution to the transfer resistance. For the first time  it was experimentally proved that the application of a weak electric field (about 1-3 V/cm) provides a significant acceleration of exchanging regeneration processes of the cation-exchange resin KU-2-8. The acceleration mechanism is associated with the occurrence of electromigration in the direction of the ions motion. The result of the processing of ion exchangers which the electric field is the increase in the degree of the ions sorption over a fixed period of time or the reduction of  the time required to reach a given degree of ions sorption. The study of the processes kinetics was carried out in a laboratory column with determination of the solution composition by means of its electroconductivity measurements. Model solutions consisted only of two components, NaOH and NaCl, with a known and constant total concentration. Therefore, it was possible to develop the method of determination of the substances ratio on the basis of specific conductivity measurement and the reference date of molar conductivity of the ions and their temperature dependence. The method accuracy is determined only by the measurement accuracy. In the study of dynamics of the Cl- adsorption the time to overshoot 0  was determined with high accuracy.