Publikace detail

Transport of Some Strong Incompletely Dissociated Acids through Anion-exchange Membrane

Autoři: Palatý Zdeněk | Žáková Alena

Rok: 2003

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Colloid and Interface Science

Název nakladatele: Academic Press (Elsevier)

Místo vydání: San Diego, California

Strana od-do: 188-199

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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