N-dodecyl β-D-glucopyranoside micelles catalyzed reaction of ascorbic acid with azure A chloride salt dye in acidic aqueous solution: A kinetic, thermodynamic, and mechanism study.

The current study has investigated the reaction of ascorbic acid with azure A chloride salt dye spectrophotometrically by following the absorbance decline of azure A chloride salt at 630 nm in the presence and absence of a non-ionic micelle of the natural surfactant (N-dodecyl β-D-glucopyranoside). Thus, the primary aim was to examine the influence of the non-ionic natural surfactant on the reaction rates of ascorbic acid with azure A chloride salt dye in acidic aqueous media, as well as using the Piszkiewicz, Arrhenius, and Eyring equations to clarify its catalytic effect in pre- and micellar phases. Hence, the kinetic experiments were achieved by adapting pseudo-first-order reaction conditions with respect to the azure A chloride salt dye. However, the reaction was found to be fractional order with respect to the oxidant, reductant, and H2SO4. The findings reveal the reaction rates have been enhanced in the presence of N-dodecyl β-D-glucopyranoside through the formation of several hydrogen bonds, which play a significant role in the binding N-dodecyl β-D-glucopyranoside monomers and micelles with reactant molecules in pre-micellar and micellar phases, in addition to determination of critical micelle concentration of N-dodecyl β-D-glucopyranoside at specific conditions. Thus, the aspects of kinetic features, thermodynamic parameters, the products at the end of the reactions, and their probable mechanism are estimated and discussed. [ABSTRACT FROM AUTHOR]