限外濾過における電解質染料の透過挙動

概要

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The permeation behavior of direct dyes and acidic dyes through cellulose acetate membranes for ultrafiltration was investigated in their binary or ternary systems. In binary (dye-H<SUB>2</SUB>O) systems, the rejections of direct dyes were almost 100% and the rejections of acidic dyes were somewhat low. For example, the rejection of Orange II, molecular weight of which was the lowest of all acidic dyes, was about 80%. The rejections of acidic dyes increased with the increase in their molecular weight and the number of sulfonic group contained in the molecule. In case the molecular weight was more than 600, the rejection of acidic dye was almost 100%. In a ternary (dye-NaCl-H O) system, the rejection of a dye was much lower compared with the rejection in the binary system. Even the rejection of a direct dye was considerably low in the ternary system. The effect of NaC1 on the dye rejection was explained based on Donnan equilibrium. It was also made clear that the logarism of dye amount of adsorption was expressed by the logarism of the product of NaCl and dye concedtration. These facts helped us more precise understanding of the permeation behavior of dyes in ternary systems.
日本膜学会の論文