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Derivatives of disodium 1-phenylazo-2-hydroxy-3, 6-naphthalenedisulfonate, some of which contain a trifluoromethyl or methyl group, were prepared and their sorption behavior by a nylon 6 film at pH3 was investigated. The dye uptake by the nylon 6 film increased linearly with sorption time. The slopes of the linear plots varied depending on the dye structure: the kind and number of the substituents in the dyes affected the slopes. The analysis of the sorption isotherms based on a dual sorption mechanism, which consists of partition and Langmuir type sorption, gave the partition coefficients (KP) and the number of binding sites (n) and intrinsic binding constants (KL) for the Langmuir type sorption. The introduction of the trifluoromethyl or methyl group into the dye molecules hardly influenced KP and n, while it changed the KL values significantly. Furthermore, thermodynamic parameters, enthalpy change and entropy change, for the Langmuir type sorption were greatly affected by the replacement of the substituents, suggesting that the hydrophobic interaction should be concerned with the Langmuir type sorption.

Sorption of Fluorinated Azo Dyes Containing Two Sulfonate Groups by a Nylon 6 Film.