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Transport of Some Strong Incompletely Dissociated Acids through Anion-exchange Membrane
Authors: Palatý Zdeněk | Žáková Alena
Year: 2003
Type of publication: článek v odborném periodiku
Name of source: Journal of Colloid and Interface Science
Publisher name: Academic Press (Elsevier)
Place: San Diego, California
Page from-to: 188-199
Titles:
Language Name Abstract Keywords
cze Transport of Some Strong Incompletely Dissociated Acids through Anion-exchange Membrane Nitric and sulfuric acids belong among strong incompletely dissociated acids, so that in the description of their transport through an ion-exchange membrane, ionic equilibria have to be taken into account. The paper presents the determination of ionic mobilities and diffusivity of non-dissociated form of these acids. For that purpose, data on the dialysis experiments with nitric and sulfuric acids in a batch mixed cell with an anion-exchange membrane NEOSEPTA-AFN, which have been completed by those on the membrane conductivity, have been used. The dependencies of ionic mobilities and diffusivity of non-dissociated form of nitric acid upon the acid concentration in the membrane have been approximated by the second degree polynomials. Their coefficients have been determined by the numerical integration of the partial differential equation describing the concentration fields of the acids in the membrane and liquid films on both the sides of the membrane followed by an optimizing procedure. The model used is based on the Nernst?Planck electro-diffusion equation. Using all the experimental data obtained at various acid concentrations and rotational speeds of the stirrers, it has been found that ionic mobility is strongly affected by the acid concentration in the membrane and decreases in the series H3O+, SO42?, NO3?,HSO4?. kyselina dusičná;kyselina sírová;difuzní dialýza;iontová pohyblivost;Nernst-Planckova rovnice
eng Transport of Some Strong Incompletely Dissociated Acids through Anion-exchange Membrane Nitric and sulfuric acids belong among strong incompletely dissociated acids, so that in the description of their transport through an ion-exchange membrane, ionic equilibria have to be taken into account. The paper presents the determination of ionic mobilities and diffusivity of non-dissociated form of these acids. For that purpose, data on the dialysis experiments with nitric and sulfuric acids in a batch mixed cell with an anion-exchange membrane NEOSEPTA-AFN, which have been completed by those on the membrane conductivity, have been used. The dependencies of ionic mobilities and diffusivity of non-dissociated form of nitric acid upon the acid concentration in the membrane have been approximated by the second degree polynomials. Their coefficients have been determined by the numerical integration of the partial differential equation describing the concentration fields of the acids in the membrane and liquid films on both the sides of the membrane followed by an optimizing procedure. The model used is based on the Nernst?Planck electro-diffusion equation. Using all the experimental data obtained at various acid concentrations and rotational speeds of the stirrers, it has been found that ionic mobility is strongly affected by the acid concentration in the membrane and decreases in the series H3O+, SO42?, NO3?,HSO4?. nitric acid;sulfuric acid;diffusion dialysis;ionic mobility;Nernst?Planck equation

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