Kinetics of interaction of fuchsin basic and fuchsin acid dyes with hydroxide ion in micellar solutions of surfactants of various types
Abstract
The rate constants of reaction between dyes fuchsin acid (FA) and fuchsin basic (FB) with hydroxide ion have been determined in solutions of surfactants of various types: Brij 35 and Triton X-100 (nonionic surfactants), sodium dodecylsulfate (SDS, anionic surfactant) cetyltrimethylammonium bromide (CTAB, cationic surfactant) and 3‑(dimetildodecylammonio)-propanesulfonate (DMDAPS, zwitterionic surfactant). It has been found that, the increase in concentration of the nonionic surfactants practically does not influence the rate constant for the FA reaction, while in case of the FB – the rate constant decreases. The increase in SDS concentration in solution leads to a sharp inhibition of the FB reaction, but has no effect on the reaction rate of FA. The increase in CTAB concentration in solution cause a decrease in reaction rate of FA but does not affect the reaction rate of FB. The effect of zwitterionic surfactant on FA reaction rate is similar to that observed for CTAB, while in case of FB it is close to the effect of nonionic surfactants. The dependencies of the rate constants of the FA and FB on the type of surfactant have been considered taking into account the dependence of degree of binding of dyes by micelles on the sign of charge of their surface, the charge and the hydrophilicity of the dyes ions, and varying the concentration of OH– ions in the Stern layer of the micelles depending on the charge of the micellar surface.
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