電解質染料の吸着に伴う膜電位変化と膜透過挙動

概要

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In case a trace amount (1-10ppm) of a electrolyte having the affinity to cellulose acetate coexists in NaC1 solution, the rejection of NaC1 increases remarkably with a little loss of water flux. Concerning this fact it is speculated that the affinity substance is dominantly distributed in the membrane based on Donnan equilibrium and thereby densifies the membrane, thus promotes NaC1 rejection by the membrane. In this report, in order to confirm above-mentioned Donnan effect, the adsorption amounts of affinity substances (acidic and basic dyes) to membrane and membrane potentials accomponied by the adsorption were measured and transference numbers of ions in the membrane were calculated. The results revealed that the dye having a negatively charged functional group accelerated the transference of a cation and vise versa. The change in transference number of anion depended on the adsorption amount of the dye. The experimental results showed that affinity substances influenced greatly Donnan effect even if the slight amount was added in the solution and thereby affected tfle semipermeability of the membrane.
日本膜学会の論文