Thermodynamic description of a non-exchange sorption of HNO3 and NаNO3 by high based anion exchangers
Abstract
Description non-exchange sorption of substances by ion exchangers is an important task of chemistry
sorption processes. The sorption of nitric acid and sodium nitrate from solutions of a highly basic anion
exchangers AV-17-2P and AV-17-8 in the NO3-form is investigated. It is shown the absorption of nitric acid
is higher than sodium nitrate; more water content in the sorbent contributes to greater sorption of both electrolytes.
For the thermodynamic description of equilibrium in the studied systems at high concentrations of
solution used the theory of adsorption, according to which the absorption of substances is presented as a stoichiometric
process. The absorbed ion pair electrolyte sorption centers are held due to the action of ion-dipole
forces. Sorption center in anion exchanger phase is a fixed electrolyte «functional group – counter ion». The
stoichiometry of the process, the coefficients of equilibrium, the coefficients of activity of components in the
solution phase and the sorbent and the thermodynamic equilibrium constants is discussed.
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